FIPS Code | State | County name | 1993 Rural-urban continuum code | Description | County population 1990 |
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| 34001 | NJ | Atlantic County | 2 | County in metro area of 250,000 to 1 million population | 224,327 | | 34003 | NJ | Bergen County | 0 | Central county of a metro area with 1 million population or more | 825,380 | | 34005 | NJ | Burlington County | 0 | Central county of a metro area with 1 million population or more | 395,066 | | 34007 | NJ | Camden County | 0 | Central county of a metro area with 1 million population or more | 502,824 | | 34009 | NJ | Cape May County | 2 | County in metro area of 250,000 to 1 million population | 95,089 | | 34011 | NJ | Cumberland County | 3 | County in metro area of fewer than 250,000 population | 138,053 | | 34013 | NJ | Essex County | 0 | Central county of a metro area with 1 million population or more | 778,206 | | 34015 | NJ | Gloucester County | 0 | Central county of a metro area with 1 million population or more | 230,082 | | 34017 | NJ | Hudson County | 0 | Central county of a metro area with 1 million population or more | 553,099 | | 34019 | NJ | Hunterdon County | 1 | Fringe county of a metro area with 1 million population or more | 107,776 | | 34021 | NJ | Mercer County | 2 | County in metro area of 250,000 to 1 million population | 325,824 | | 34023 | NJ | Middlesex County | 0 | Central county of a metro area with 1 million population or more | 671,780 | | 34025 | NJ | Monmouth County | 0 | Central county of a metro area with 1 million population or more | 553,124 | | 34027 | NJ | Morris County | 0 | Central county of a metro area with 1 million population or more | 421,353 | | 34029 | NJ | Ocean County | 0 | Central county of a metro area with 1 million population or more | 433,203 | | 34031 | NJ | Passaic County | 0 | Central county of a metro area with 1 million population or more | 453,060 | | 34033 | NJ | Salem County | 1 | Fringe county of a metro area with 1 million population or more | 65,294 | | 34035 | NJ | Somerset County | 0 | Central county of a metro area with 1 million population or more | 240,279 | | 34037 | NJ | Sussex County | 1 | Fringe county of a metro area with 1 million population or more | 130,943 | | 34039 | NJ | Union County | 0 | Central county of a metro area with 1 million population or more | 493,819 | | 34041 | NJ | Warren County | 1 | Fringe county of a metro area with 1 million population or more | 91,607 |
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