FIPS Code | State | County name | 1993 Rural-urban continuum code | Description | County population 1990 |
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| 10001 | DE | Kent County | 3 | County in metro area of fewer than 250,000 population | 110,993 | | 10003 | DE | New Castle County | 2 | County in metro area of 250,000 to 1 million population | 441,946 | | 10005 | DE | Sussex County | 6 | Nonmetro county with urban pop. of 2,500-19,999, adjacent to a metro area | 113,229 |
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