FIPS Code | State | County name | 2003 Rural-urban continuum code | Description | County population 2000 |
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| 23001 | ME | Androscoggin County | 3 | County in metro area of fewer than 250,000 population | 103,793 | | 23003 | ME | Aroostook County | 7 | Nonmetro county with urban population of 2,500-19,999, not adjacent to a metro area | 73,938 | | 23005 | ME | Cumberland County | 2 | County in metro area of 250,000 to 1 million population | 265,612 | | 23007 | ME | Franklin County | 6 | Nonmetro county with urban population of 2,500-19,999, adjacent to a metro area | 29,467 | | 23009 | ME | Hancock County | 6 | Nonmetro county with urban population of 2,500-19,999, adjacent to a metro area | 51,791 | | 23011 | ME | Kennebec County | 4 | Nonmetro county with urban population of 20,000 or more, adjacent to a metro area | 117,114 | | 23013 | ME | Knox County | 7 | Nonmetro county with urban population of 2,500-19,999, not adjacent to a metro area | 39,618 | | 23015 | ME | Lincoln County | 8 | Nonmetro county completely rural or less than 2,500 urban population, adj. to metro area | 33,616 | | 23017 | ME | Oxford County | 6 | Nonmetro county with urban population of 2,500-19,999, adjacent to a metro area | 54,755 | | 23019 | ME | Penobscot County | 3 | County in metro area of fewer than 250,000 population | 144,919 | | 23021 | ME | Piscataquis County | 8 | Nonmetro county completely rural or less than 2,500 urban population, adj. to metro area | 17,235 | | 23023 | ME | Sagadahoc County | 2 | County in metro area of 250,000 to 1 million population | 35,214 | | 23025 | ME | Somerset County | 6 | Nonmetro county with urban population of 2,500-19,999, adjacent to a metro area | 50,888 | | 23027 | ME | Waldo County | 6 | Nonmetro county with urban population of 2,500-19,999, adjacent to a metro area | 36,280 | | 23029 | ME | Washington County | 7 | Nonmetro county with urban population of 2,500-19,999, not adjacent to a metro area | 33,941 | | 23031 | ME | York County | 2 | County in metro area of 250,000 to 1 million population | 186,742 |
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