| Jefferson County, AL (County) |
| Jefferson County, GA (County) |
| Jefferson County, WV (County) |
| Jefferson County, IN (County) |
| Jefferson County, MO (County) |
| Jefferson County, ID (County) |
| Jefferson County, KS (County) |
| Jefferson County, OH (County) |
| Jefferson County, WA (County) |
| Jefferson County, WI (County) |
| Jefferson County, FL (County) |
| Jefferson County, CO (County) |
| Jefferson County, PA (County) |
| Jefferson Davis County, MS (County) |
| Jefferson Davis Parish, LA (County) |
