List of county roads in Union County, Florida
The following is a list of county roads in Union County, Florida. All county roads are maintained by the county in which they reside.
County roads in Union County
| Route | Road Name | From | To | Notes |
| Columbia-Union County Line | SR 121 | former SR 18 | ||
| SR 121 & CR 239A | SR 18 | former SR 18A | ||
| SR 100 | CR 231 | former SR 231A | ||
| SR 121 | Union-Bradford County Line | former SR 125 | ||
| SR 16 | CR 125 | former SR 199 | ||
| Baker-Union County Line | Union-Bradford County Line | former SR 229 | ||
| Bradford-Union County Line | SR 231 | former SR 231 | ||
| SR 100 | Union-Baker County Line | former SR 231 | ||
| SR 121 | CR 231 | former SR 231A | ||
| former SR 237 | ||||
| SRs 100 & SR 238 | CR 229 | former SR 238 | ||
| SR 238 | CR 18 | former SR 238A | ||
| CR 18 | SR 100 | former SR 239 | ||
| former SR 239A | ||||
| CR 239 | Oak Grove Cemetery | former SR 239 | ||
| Columbia-Union County Line | CR 240 | former SR 240 | ||
| Alachua-Union County Line | Columbia-Union County Line | former SR 241 Brief gap at SR 238 | ||
| CR 791 | CR 241 | former SR 241A | ||
| Price Creek Road | CR 791 | Union-Columbia County Line | former SR 241A and SR 245 | |
| CR 18 | SR 238 | former SR 791 | ||
| former SR 793 | ||||
| CR 238A | SR 121 & CR 231A | former SR 796 | ||
| CR 796 | SR 238 | former SR 796A |