| Jefferson County, OR (ISD) |
| Jefferson County, MO (ISD) |
| Jefferson County, NY (ISD) |
| Jefferson County, TX (ISD) |
| Jefferson County, OK (ISD) |
| Jefferson County, ID (ISD) |
| Jefferson County, TN (ISD) |
| Jefferson County, IA (ISD) |
| Jefferson County, KS (ISD) |
| Jefferson County, WA (ISD) |
| Jefferson County, MT (ISD) |
| Jefferson County, NE (ISD) |
| Jefferson County, MS (ISD) |
| Jefferson County, AL (ISD) |
| Jefferson County, TN (District) |
