OPINION OF THE COURT
SEITZ, Circuit Judge.
I.
Plaintiffs appeal a final order of the district court granting summary judgment to defendants in a civil rights action attacking the constitutionality of a city ordinance requiring employees of the city, with certain exceptions, to live therein. Our review is plenary.
II.
The individual plaintiff (“Scull”) was employed by the City of Salem, New Jersey (“City”) as a laborer. He moved his residence from the city to suburban New Jersey, giving as his reason the health, safety, and welfare of his family. He was notified that such action was in violation of the city’s residential requirement and he would be terminated if he did not correct the situation. Scull would not comply and this action to bar his discharge followed.
Section 2 of the Salem Municipal Residency Ordinance recites that
Except as otherwise provided by law, all full-time permanent and full-time, part-[267]*267time officers and employees hereinafter to be employed by the City of Salem, are hereby required as a condition of their employment to have their place of abode in the City of Salem and be a bona fide domiciliary therein.
Joint Appendix (“JA”) 38 (Ordinance # 78-3).
The preamble to the ordinance cites the following reasons for the requirement:
Whereas, said residency will not only reduce the high unemployment rate in the City, but will also improve relations among City employees; enhance the quality of employee performance by greater personal knowledge of conditions and problems in the City; promote a feeling of greater personal interest in the City’s progress; reduce the possibility of tardiness and absenteeism; provide a ready availability of trained manpower for emergency situations; and provide unto the City economic benefits....
JA 25.
Salem Blue Collar Workers Association (“Association”), the collective bargaining agent for the blue-collar and clerical employees of the City of Salem, and Scull filed a four-count complaint in the district court seeking, inter alia, declaratory and injunc-tive relief barring enforcement of the ordinance. They alleged that the ordinance violates the Privileges and Immunities Clause of Article IV, § 2 and the Equal Protection Clause of the Fourteenth Amendment to the United States Constitution.
The parties then filed cross-motions for summary judgment. The district court held that the ordinance did not violate either constitutional provision and granted summary judgment to defendants. Plaintiffs’ appeal followed.
III.
A. The Privileges and Immunities Clause
The Privileges and Immunities Clause of the United States Constitution provides that “[t]he Citizens of each State shall be entitled to all Privileges and Immunities of Citizens in the several States.” U.S. Const, art. IV, § 2. The purpose of the Clause was to foster a national union by discouraging discrimination against residents of another state on the basis of citizenship. See Paul v. Virginia, 75 U.S. (8 Wall.) 168, 180, 19 L.Ed. 357 (1869).
Despite the language of the Clause embracing “each State,” the United States Supreme Court has recently held that the Clause may include municipal residency ordinances. United Bldg. & Constr. Trades Council v. Mayor & Council of Camden, 465 U.S. 208, 214-15, 104 S.Ct. 1020, 1025-26, 79 LEd.2d 249 (1984). The Court’s rationale for this expansive reading of the Clause is based on the relationship between the state and its municipality: since a municipality is granted its power to act from the state, it is as subject to the Clause as the state would be.
1. Standing
The district court granted summary judgment to the City on Scull’s privileges and immunities claim because it concluded that he lacked standing. Salem Blue Collar Workers Ass’n v. City of Salem, 832 F.Supp. 852, 856 (D.N.J.1993). In so concluding, the district court relied on language in the Supreme Court’s opinion in the Camden case. There the Court stated that “[i]t is true that New Jersey citizens not residing in Camden will be affected by the ordinance as well as out-of-state citizens. And it is true that the disadvantaged New Jersey residents have no claim under the Privileges and Immunities Clause.” Id. at 217, 104 S.Ct. at 1027 (citing The Slaughter-House Cases, 83 U.S. (16 Wall.) 36, 74-75, 21 L.Ed. 394 (1872)). The implication from this language is that individual New Jersey residents have no standing to challenge a New Jersey municipal ordinance. The district court’s ruling here is consistent with the Supreme Court’s analysis in Camden. Thus, Scull lacked standing to assert a privileges and immunities claim.
In contrast to its ruling in regard to Scull, the district court concluded that the Association had standing on its privileges and immunities claim because the complaint alleged that the Association was comprised, inter alia, of members who lived outside the State of New Jersey and others who might [268]*268live outside the state but for the ordinance.1 Salem, 832 F.Supp. at 856. The Court in Camden noted that one of the member associations that belonged to the Council in Camden had “at least some members who reside outside New Jersey,” 465 U.S. at 212 n. 4, 104 S.Ct. at 1024 n. 4, and thus had standing. On that basis we agree with the district court’s ruling on the Association’s standing and proceed to its privileges and immunities claim.
2. Privileges and Immunities Clause Analysis
A valid privileges and immunities claim requires proof of two elements: (1) whether the interest or right being burdened is “fundamental” and thus, protected by the Clause, see The Slaughter-House Cases, 83 U.S. (16 Wall) at 76; and (2) if it is, whether there are “substantial” reasons for the discrimination and “whether the degree of discrimination bears a close relation to them,” Toomer v. Witsell, 334 U.S. 385, 396, 68 S.Ct. 1156, 1162, 92 L.Ed. 1460 (1948).
We first decide whether the right being burdened — direct public employment— is one that is “fundamental.” As the Supreme Court stated in Baldwin v. Fish & Game Commission, 436 U.S. 371, 98 S.Ct. 1852, 56 L.Ed.2d 354 (1978), “[o]nly with respect to those ‘privileges’ and ‘immunities’ bearing upon the vitality of the Nation as a single entity must the State treat all citizens, resident and nonresident, equally.” Id. at 383, 98 S.Ct. at 1860. The Court’s formulation of the controlling standard is but the beginning of analysis.
Up to this point in time, the Supreme Court has dealt only with prohibitions involving the practice of trades and businesses— private employment. See, e.g., Supreme Court of N.H. v. Piper, 470 U.S. 274, 105 S.Ct. 1272, 84 L.Ed.2d 205 (1985) (the practice of law);2 Hicklin v. Orbeck,
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OPINION OF THE COURT
SEITZ, Circuit Judge.
I.
Plaintiffs appeal a final order of the district court granting summary judgment to defendants in a civil rights action attacking the constitutionality of a city ordinance requiring employees of the city, with certain exceptions, to live therein. Our review is plenary.
II.
The individual plaintiff (“Scull”) was employed by the City of Salem, New Jersey (“City”) as a laborer. He moved his residence from the city to suburban New Jersey, giving as his reason the health, safety, and welfare of his family. He was notified that such action was in violation of the city’s residential requirement and he would be terminated if he did not correct the situation. Scull would not comply and this action to bar his discharge followed.
Section 2 of the Salem Municipal Residency Ordinance recites that
Except as otherwise provided by law, all full-time permanent and full-time, part-[267]*267time officers and employees hereinafter to be employed by the City of Salem, are hereby required as a condition of their employment to have their place of abode in the City of Salem and be a bona fide domiciliary therein.
Joint Appendix (“JA”) 38 (Ordinance # 78-3).
The preamble to the ordinance cites the following reasons for the requirement:
Whereas, said residency will not only reduce the high unemployment rate in the City, but will also improve relations among City employees; enhance the quality of employee performance by greater personal knowledge of conditions and problems in the City; promote a feeling of greater personal interest in the City’s progress; reduce the possibility of tardiness and absenteeism; provide a ready availability of trained manpower for emergency situations; and provide unto the City economic benefits....
JA 25.
Salem Blue Collar Workers Association (“Association”), the collective bargaining agent for the blue-collar and clerical employees of the City of Salem, and Scull filed a four-count complaint in the district court seeking, inter alia, declaratory and injunc-tive relief barring enforcement of the ordinance. They alleged that the ordinance violates the Privileges and Immunities Clause of Article IV, § 2 and the Equal Protection Clause of the Fourteenth Amendment to the United States Constitution.
The parties then filed cross-motions for summary judgment. The district court held that the ordinance did not violate either constitutional provision and granted summary judgment to defendants. Plaintiffs’ appeal followed.
III.
A. The Privileges and Immunities Clause
The Privileges and Immunities Clause of the United States Constitution provides that “[t]he Citizens of each State shall be entitled to all Privileges and Immunities of Citizens in the several States.” U.S. Const, art. IV, § 2. The purpose of the Clause was to foster a national union by discouraging discrimination against residents of another state on the basis of citizenship. See Paul v. Virginia, 75 U.S. (8 Wall.) 168, 180, 19 L.Ed. 357 (1869).
Despite the language of the Clause embracing “each State,” the United States Supreme Court has recently held that the Clause may include municipal residency ordinances. United Bldg. & Constr. Trades Council v. Mayor & Council of Camden, 465 U.S. 208, 214-15, 104 S.Ct. 1020, 1025-26, 79 LEd.2d 249 (1984). The Court’s rationale for this expansive reading of the Clause is based on the relationship between the state and its municipality: since a municipality is granted its power to act from the state, it is as subject to the Clause as the state would be.
1. Standing
The district court granted summary judgment to the City on Scull’s privileges and immunities claim because it concluded that he lacked standing. Salem Blue Collar Workers Ass’n v. City of Salem, 832 F.Supp. 852, 856 (D.N.J.1993). In so concluding, the district court relied on language in the Supreme Court’s opinion in the Camden case. There the Court stated that “[i]t is true that New Jersey citizens not residing in Camden will be affected by the ordinance as well as out-of-state citizens. And it is true that the disadvantaged New Jersey residents have no claim under the Privileges and Immunities Clause.” Id. at 217, 104 S.Ct. at 1027 (citing The Slaughter-House Cases, 83 U.S. (16 Wall.) 36, 74-75, 21 L.Ed. 394 (1872)). The implication from this language is that individual New Jersey residents have no standing to challenge a New Jersey municipal ordinance. The district court’s ruling here is consistent with the Supreme Court’s analysis in Camden. Thus, Scull lacked standing to assert a privileges and immunities claim.
In contrast to its ruling in regard to Scull, the district court concluded that the Association had standing on its privileges and immunities claim because the complaint alleged that the Association was comprised, inter alia, of members who lived outside the State of New Jersey and others who might [268]*268live outside the state but for the ordinance.1 Salem, 832 F.Supp. at 856. The Court in Camden noted that one of the member associations that belonged to the Council in Camden had “at least some members who reside outside New Jersey,” 465 U.S. at 212 n. 4, 104 S.Ct. at 1024 n. 4, and thus had standing. On that basis we agree with the district court’s ruling on the Association’s standing and proceed to its privileges and immunities claim.
2. Privileges and Immunities Clause Analysis
A valid privileges and immunities claim requires proof of two elements: (1) whether the interest or right being burdened is “fundamental” and thus, protected by the Clause, see The Slaughter-House Cases, 83 U.S. (16 Wall) at 76; and (2) if it is, whether there are “substantial” reasons for the discrimination and “whether the degree of discrimination bears a close relation to them,” Toomer v. Witsell, 334 U.S. 385, 396, 68 S.Ct. 1156, 1162, 92 L.Ed. 1460 (1948).
We first decide whether the right being burdened — direct public employment— is one that is “fundamental.” As the Supreme Court stated in Baldwin v. Fish & Game Commission, 436 U.S. 371, 98 S.Ct. 1852, 56 L.Ed.2d 354 (1978), “[o]nly with respect to those ‘privileges’ and ‘immunities’ bearing upon the vitality of the Nation as a single entity must the State treat all citizens, resident and nonresident, equally.” Id. at 383, 98 S.Ct. at 1860. The Court’s formulation of the controlling standard is but the beginning of analysis.
Up to this point in time, the Supreme Court has dealt only with prohibitions involving the practice of trades and businesses— private employment. See, e.g., Supreme Court of N.H. v. Piper, 470 U.S. 274, 105 S.Ct. 1272, 84 L.Ed.2d 205 (1985) (the practice of law);2 Hicklin v. Orbeck, 437 U.S. 518, 98 S.Ct. 2482, 57 L.Ed.2d 397 (1978) (occupations downstream from state-owned oil and gas interests); Toomer v. Witsell, 334 U.S. 385, 68 S.Ct. 1156, 92 L.Ed. 1460 (1948) (commercial shrimp fishing); Ward v. Maryland, 79 U.S. (12 Wah.) 418, 20 L.Ed. 449 (1871) (merchants); cf. Baldwin, 436 U.S. at 388, 98 S.Ct. at 1862-63 (rejecting argument that recreational moose hunting is a fundamental right deserving of the Clause’s protection).
The focus of our analysis is on the proposition that the right to pursue a “common calling” is within the purview of the Privileges and Immunities Clause. Hicklin v. Orbeck, 437 U.S. at 524, 98 S.Ct. at 2487 (stating that the “protection of the Clause is strongly supported by this Court’s decisions holding violative of the Clause state discrimination against nonresidents seeking to ply their trade, practice their occupation, or pur[269]*269sue a common calling within the State”); Toomer, 834 U.S. at 403, 68 S.Ct. at 1165 (commercial shrimping is within the scope of the Clause).
Because of the commercial nature of the term “common calling,” early Court decisions looked to the Commerce Clause for guidance in their analyses, citing the “mutually reinforcing relationship between the Privileges and Immunities Clause of Article IV, § 2, and the Commerce Clause.” Hicklin, 437 U.S. at 524, 98 S.Ct. at 2487.3 In White v. Massachusetts Council of Construction Employers, Inc., 460 U.S. 204,103 S.Ct. 1042, 75 L.Ed.2d 1 (1983), the Court reviewed, under the Commerce Clause, the constitutionality of an executive order issued by the Mayor of Boston that required all construction projects funded in whole or in part by city funds to employ a work force at least half of whom were residents of the city. The Court held that the City was acting in a proprietary capacity and was a market participator, not a market regulator, and therefore was not in violation of the restraints of the Commerce Clause. It is significant to note that in dicta the Court said that the executive order affected the contractual relationship between the contractors and their employees, and as such, the employees were actually “working for the city.” Id. at 211 n. 7, 103 S.Ct. at 1046 n. 7. Thus, they did not have the benefit of the Privileges and Immunities Clause when Boston favored its own citizens.
In Camden, the Supreme Court came close to deciding the issue of whether public employment is a “fundamental” privilege protected by the Privileges and Immunities Clause. Camden involved a challenge to a city ordinance that required at least 40% of the employees of the contractors and subcontractors working on city projects to be Camden residents. The Court stated that the threshold determination was “whether an out-of-state resident’s interest in employment on public works contracts in another State is sufficiently ‘fundamental’ to the promotion of interstate harmony so as to ‘fall within the purview of the Privileges and Immunities Clause.’ ” Camden, 465 U.S. at 218, 104 S.Ct. at 1027 (quoting Baldwin, 436 U.S. at 388, 98 S.Ct. at 1862-63).
The Court refused to “mechanically” adopt the Commerce Clause analysis used in White. Id. at 219, 104 S.Ct. at 1028.4 The Association contends that the Court’s rejection of the White rationale signals a rejection of the public/private distinction in the area of employment. Closer scrutiny of the Court’s reasoning in Camden, however, suggests otherwise.
Despite the Court’s refusal to apply the White analysis, the public/private distinction survives as we read the Camden decision. Camden first stated that the pursuit of a common calling is a fundamental privilege protected by the Clause, id. at 219,104 S.Ct. at 1028, but then drew a clear distinction between public and private employment by stating that “[pjublie employment ... is qualitatively different from employment in the private sector; it is a subspecies of the broader opportunity to pursue a common calling,” id.
Although Camden refers to public employment as a “subspecies” of “common callings,” the public/private distinction can be justified on the basis of the history of the language associated with the clauses. The Privileges and Immunities Clause traces its origin to the language employed in the Fourth Article of the Articles of Confederation. That Article used terms that were referable to private employment, e.g., “trade” and “commerce.” See David S. Bogen, The Individual Liber[270]*270ties Within the Body of the Constitution: A Symposium: The Privileges and Immunities Clause of Article IV, Case W.Res.L.Rev. 794, 831 (1987) (suggesting that “[djespite uncertainty, one function of article IV ... remained clear: it prohibited states from imposing any restriction not applicable to residents on nonresidents engaged in trade or commerce”).
When the articles of the Constitution were drafted, the language of both the Privileges and Immunities Clause and the Commerce Clause was taken from the Fourth Article of the Articles of Confederation. It is on this historical basis that the distinction between public and private employment remains viable here. See Thomas H. Day, Note, Hiring Preference Acts: Has the Supreme Court Rendered Them Violations of the Privileges and Immunities Clause?, 54 Fordham L.Rev. 271,278 (1985) (discussing the distinction the Court has drawn between private and government employment); see also Bo-gen, supra at 856 (stating that “[t]he right to engage in a trade or business is a privilege or immunity of citizenship”); Mark P. Gergen, The Selfish State and the Market, 66 Tex. L.Rev. 1097, 1129 (1988) (noting that early cases striking down state laws under the Privileges and Immunities Clause involved the “core privileges of trade and commerce”).
Based on this historical foundation, we ask whether private or public employment is implicated by Scull’s employment with the City of Salem. Our analysis turns on the nature of the employment relationship between employer and employee, not the character of the job being performed.
The Court in Camden held that a private employment relationship existed there. In Camden, the contractors and subcontractors were working under contract to the City and being paid in part or whole with city funds. White suggested that the employees of the contractors could be considered to be “working for the city” and therefore, have no claim. The Camden Court, however, refused to apply White’s Commerce Clause reasoning citing the employees’ right to “seek employment with ... private employers.” Id. 465 U.S. at 221, 104 S.Ct. at 1029 (emphasis added).5
Our case is distinguishable by comparing the direct and indirect nature of the government employment. The employment in our case is directly with the governmental entity — there is no intervening private employment as there was in White, where the contractors and subcontractors were under contract to the City of Boston, but the individual employees were under contract to the contractors and subcontractors. The Camden court recognized this distinction when it concluded that “[t]he opportunity to seek employment with such private employers is ‘sufficiently basic to the livelihood of the Nation,’ ... as to fall within the purview of the Privileges and Immunities Clause even though the contractors and subcontractors are themselves engaged in projects funded in whole or part by the city.” Id. at 221-22,104 5.Ct. at 1029 (quoting Baldwin, 436 U.S. at 388, 98 S.Ct. at 1863).
We agree with the district court in this case that the public/private distinction has not been abandoned. Based on our reading of the Supreme Court cases in this area, we hold that direct public employment is not a privilege or fundamental right protected by the Privileges and Immunities Clause of Article Four.
In light of our holding that there is no fundamental right implicated here, it is unnecessary for this court to discuss the second issue of “substantial relatedness.”6
[271]*271B. Equal Protection Challenge
Plaintiffs7 argue in the alternative that the ordinance, as it is applied by the City, violates the Equal Protection Clause of the Fourteenth Amendment.
At the outset, plaintiffs concede that the “rational basis” test is to be used in the analysis of their due process claim because the ordinance does not affect a fundamental right, see Massachusetts Bd. of Retirement v. Murgia, 427 U.S. 307, 313, 96 S.Ct. 2562, 2566, 49 L.Ed.2d 520 (1976), and does not discriminate against a suspect class.
The Equal Protection Clause directs that “all persons similarly situáted should be treated alike.” City of Cleburne v. Cleburne Living Ctr., Inc., 473 U.S. 432, 439, 105 S.Ct. 3249, 3254, 87 L.Ed.2d 313 (1985). To withstand constitutional scrutiny under the rational basis test, the classifications created by the legislation “must be rationally related to a legitimate governmental purpose.” Id. at 446, 105 S.Ct. at 3258.
The Supreme Court has held that municipal residency requirements for maintaining employment are not irrational. McCarthy v. Philadelphia Civil Serv. Comm’n, 424 U.S. 645, 647, 96 S.Ct. 1154, 1155, 47 L.Ed.2d 366 (1976); see also Detroit Police Officers Ass’n v. City of Detroit, 405 U.S. 950, 92 S.Ct. 1173, 31 L.Ed.2d 227 (1972) (dismissing appeal for failure to present a substantial federal question by challenging a Detroit residency requirement for police officers), dismissing appeal from 385 Mich. 519, 190 N.W.2d 97 (1971) (en banc). The Supreme Court of New Jersey has also held that municipal residency requirements do not violate equal protection guarantees. Kennedy v. City of Newark, 29 NJ. 178, 148 A.2d 473 (1959) (rejecting a state constitutional challenge); Trainor v. City of Newark, 145 N.J.Super. 466, 368 A.2d 381 (App.Div.1976).
Despite the foregoing principles, plaintiffs have raised several equal protection challenges which we will address in turn.
1. State Law Exceptions
The City’s residency ordinance states that all officers and employees of the City are to be residents but the New Jersey Legislature has enacted several statutes that exempt certain employees from municipal residency requirements.8 These exemptions appear to leave the residency requirement applicable only to blue-collar and clerical employees of the City.
Although the governing state statutes exempt many employees from the ordinance, their validity is not before this court. Thus, we focus, as the district court did, solely on whether there is a “rational basis” for the City’s residency requirement. The controlling issue is whether a legitimate governmental purpose is served by the classification of the ordinance, keeping in mind that we will only set aside the ordinance’s classifications “if no grounds can be conceived to justify them.” McDonald v. Board of Election Comm’rs, 394 U.S. 802, 809, 89 S.Ct. 1404, 1408,22 L.Ed.2d 739 (1969). An examination [272]*272of the purposes set forth in the preamble to the ordinance under attack reveal grounds to support the ordinance, e.g., “provide unto the City economic benefits”. We conclude that it serves a legitimate governmental purpose.
2. Grandfather Clause Exception
Section 3(d) of the Municipal Residency Ordinance exempts from the residency requirement “[a]ny person employed by the City who resides outside the City as of the date of the adoption of this ordinance.” JA 39. Appellants claim that this is an irrational application of the residency requirement.9
The Supreme Court has approved of “grandfather” clauses that protect individuals and interests from changes in the law that would destroy established reliance on previously valid regulations and laws. See City of New Orleans v. Dukes, 427 U.S. 297, 96 S.Ct. 2513, 49 L.Ed.2d 511 (1976) (upholding in the face of an equal protection challenge a grandfather clause that exempted certain street vendors from new regulations in the French Quarter). Further, we note that at least two courts of appeals have upheld the validity of such clauses under a rational basis analysis. Lorenz v. Logue, 611 F.2d 421, 423 (2d Cir.1979) (per curiam) (“By not applying [the residency requirement] to pre-1978 employees who never received any warning of a residency requirement when they took their jobs, the City protected these employees’ legitimate expectations.” (emphasis in original)); Simien v. City of San Antonio, 809 F.2d 255, 257 (5th Cir.1987) (“The grandfathering of other employees based on the length of their employment is a constitutional means to gradually achieve a workforce that resides in the city.”). We also conclude that the exemption of those employees who were employed prior to the adoption of the ordinance and who lived outside the City does not render the ordinance unconstitutional.10 We find no irrationality in this grandfather clause.
C. Fourteenth Amendment Due Process Challenges
Plaintiffs raised five claims of due process violations under the Equal Protection Clause in the district court. The district court held that each was without merit and granted summary judgment to the City. Appellants’ brief presents only two of the original five claims for our review.
1. Selective Enforcement
Plaintiffs claim that although the ordinance had been in effect for more than fourteen years at the time of Scull’s notice of violation, there was an absence of evidence that it was invoked, which they argue shows that it was being selectively enforced against Scull. The City, however, provided evidence of enforcement of the ordinance against an employee who chose to reside outside of the City. JA 188-91. Because the City was able to negate the appellants’ claim that the ordinance was never enforced, the district court properly granted summary judgment. The appellants have not met their burden, which requires them to offer evidence “that the [municipality] intentionally and purposefully discriminated against [Scull] by failing to prosecute other similarly situated persons.” United States v. Torquato, 602 F.2d 564, 570 (3d Cir.), cert. denied, 444 U.S. 941, 100 S.Ct. 295, 62 L.Ed.2d 307 (1979). Thus the City was entitled to summary judgment.
[273]*2732. Notice of the Requirement
Plaintiffs next contend that Scull had not been given written or oral notice of the residential requirement when he was appointed to his position. The record, however, contains evidence that copies of the ordinance were posted in work areas so as to give notice to employees. JA 186.11 We note further that Scull was given ample time and opportunity to avoid termination once he had been given notice of his violation.12 Our review of the record reveals that Scull has failed to raise an issue of material fact that would require a reversal of the district court’s grant of summary judgment.
IV.
We will affirm the district court’s order granting the defendants’ summary judgment and denying plaintiffs’ motion for summary judgment.