FIPS Code | State | County name | 1993 Rural-urban continuum code | Description | County population 1990 |
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| 09001 | CT | Fairfield County | 2 | County in metro area of 250,000 to 1 million population | 827,645 | | 09003 | CT | Hartford County | 0 | Central county of a metro area with 1 million population or more | 851,783 | | 09005 | CT | Litchfield County | 4 | Nonmetro county with urban pop. of 20,000 or more, adjacent to a metro area | 174,092 | | 09007 | CT | Middlesex County | 1 | Fringe county of a metro area with 1 million population or more | 143,196 | | 09009 | CT | New Haven County | 2 | County in metro area of 250,000 to 1 million population | 804,219 | | 09011 | CT | New London County | 2 | County in metro area of 250,000 to 1 million population | 254,957 | | 09013 | CT | Tolland County | 1 | Fringe county of a metro area with 1 million population or more | 128,699 | | 09015 | CT | Windham County | 4 | Nonmetro county with urban pop. of 20,000 or more, adjacent to a metro area | 102,525 |
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