FIPS Code | State | County name | 1993 Rural-urban continuum code | Description | County population 1990 |
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| 23001 | ME | Androscoggin County | 3 | County in metro area of fewer than 250,000 population | 105,259 | | 23003 | ME | Aroostook County | 5 | Nonmetro county with urban pop. of 20,000 or more, not adjacent to a metro area | 86,936 | | 23005 | ME | Cumberland County | 3 | County in metro area of fewer than 250,000 population | 243,135 | | 23007 | ME | Franklin County | 6 | Nonmetro county with urban pop. of 2,500-19,999, adjacent to a metro area | 29,008 | | 23009 | ME | Hancock County | 6 | Nonmetro county with urban pop. of 2,500-19,999, adjacent to a metro area | 46,948 | | 23011 | ME | Kennebec County | 4 | Nonmetro county with urban pop. of 20,000 or more, adjacent to a metro area | 115,904 | | 23013 | ME | Knox County | 7 | Nonmetro county with urban pop. of 2,500-19,999, not adjacent to a metro area | 36,310 | | 23015 | ME | Lincoln County | 9 | Nonmetro county completely rural or less than 2,500 urban pop., not adj. to metro area | 30,357 | | 23017 | ME | Oxford County | 6 | Nonmetro county with urban pop. of 2,500-19,999, adjacent to a metro area | 52,602 | | 23019 | ME | Penobscot County | 3 | County in metro area of fewer than 250,000 population | 146,601 | | 23021 | ME | Piscataquis County | 6 | Nonmetro county with urban pop. of 2,500-19,999, adjacent to a metro area | 18,653 | | 23023 | ME | Sagadahoc County | 6 | Nonmetro county with urban pop. of 2,500-19,999, adjacent to a metro area | 33,535 | | 23025 | ME | Somerset County | 7 | Nonmetro county with urban pop. of 2,500-19,999, not adjacent to a metro area | 49,767 | | 23027 | ME | Waldo County | 6 | Nonmetro county with urban pop. of 2,500-19,999, adjacent to a metro area | 33,018 | | 23029 | ME | Washington County | 7 | Nonmetro county with urban pop. of 2,500-19,999, not adjacent to a metro area | 35,308 | | 23031 | ME | York County | 4 | Nonmetro county with urban pop. of 20,000 or more, adjacent to a metro area | 164,587 |
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