FIPS Code | State | County name | 2003 urban influence code | Description | 2000 population |
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| 09001 | CT | Fairfield County | 2 | Small-in a metro area with fewer than 1 million residents | 882,567 | | 09003 | CT | Hartford County | 1 | Large-in a metro area with at least 1 million residents or more | 857,183 | | 09005 | CT | Litchfield County | 5 | Micropolitan adjacent to a small metro area | 182,193 | | 09007 | CT | Middlesex County | 1 | Large-in a metro area with at least 1 million residents or more | 155,071 | | 09009 | CT | New Haven County | 2 | Small-in a metro area with fewer than 1 million residents | 824,008 | | 09011 | CT | New London County | 2 | Small-in a metro area with fewer than 1 million residents | 259,088 | | 09013 | CT | Tolland County | 1 | Large-in a metro area with at least 1 million residents or more | 136,364 | | 09015 | CT | Windham County | 5 | Micropolitan adjacent to a small metro area | 109,091 |
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