FIPS Code | State | County name | 1993 Rural-urban continuum code | Description | County population 1990 |
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| 25001 | MA | Barnstable County | 3 | County in metro area of fewer than 250,000 population | 186,605 | | 25003 | MA | Berkshire County | 3 | County in metro area of fewer than 250,000 population | 139,352 | | 25005 | MA | Bristol County | 2 | County in metro area of 250,000 to 1 million population | 506,325 | | 25007 | MA | Dukes County | 9 | Nonmetro county completely rural or less than 2,500 urban pop., not adj. to metro area | 11,639 | | 25009 | MA | Essex County | 0 | Central county of a metro area with 1 million population or more | 670,080 | | 25011 | MA | Franklin County | 4 | Nonmetro county with urban pop. of 20,000 or more, adjacent to a metro area | 70,092 | | 25013 | MA | Hampden County | 2 | County in metro area of 250,000 to 1 million population | 456,310 | | 25015 | MA | Hampshire County | 2 | County in metro area of 250,000 to 1 million population | 146,568 | | 25017 | MA | Middlesex County | 0 | Central county of a metro area with 1 million population or more | 1,398,468 | | 25019 | MA | Nantucket County | 7 | Nonmetro county with urban pop. of 2,500-19,999, not adjacent to a metro area | 6,012 | | 25021 | MA | Norfolk County | 0 | Central county of a metro area with 1 million population or more | 616,087 | | 25023 | MA | Plymouth County | 1 | Fringe county of a metro area with 1 million population or more | 435,276 | | 25025 | MA | Suffolk County | 0 | Central county of a metro area with 1 million population or more | 663,906 | | 25027 | MA | Worcester County | 0 | Central county of a metro area with 1 million population or more | 709,705 |
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