- Jefferson County (Alabama) - in the Metropolitan (Alabama) region of Alabama
- Jefferson County (Arkansas)
- Jefferson County (Colorado) - in the Front Range region of Colorado
- Jefferson County (Florida)
- Jefferson County (Georgia)
- Jefferson County (Idaho)
- Jefferson County (Illinois)
- Jefferson County (Indiana)
- Jefferson County (Iowa)
- Jefferson County (Kansas)
- Jefferson County (Kentucky)
- Jefferson Parish (Louisiana)
- Jefferson County (Mississippi)
- Jefferson County (Missouri)
- Jefferson County (Montana)
- Jefferson County (Nebraska) - in Eastern Nebraska
- Jefferson County (New York) - see Watertown (New York) and the Thousand Islands
- Jefferson County (Ohio)
- Jefferson County (Oklahoma)
- Jefferson County (Oregon)
- Jefferson County (Pennsylvania)
- Jefferson County (Tennessee)
- Jefferson County (Texas)
- Jefferson County (Washington) - in the Olympic Peninsula region of Washington (state)
- Jefferson County (West Virginia)
- Jefferson County (Wisconsin)
See also:
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