| Route | From | To | Dates | Now |
| 301 | Ochlockonee Bay | Mud Cove | 1935 | |
| 302 | Wauchula | Cowart's Corner | 1935-1945 | CR 64A |
| 303 | Carrabelle | Telogia | 1935 | |
| 304 | Rob Upthegrove Place | SR 29 | 1935 | |
| 305 | SR 4 near Lake Worth | SR 140 | 1935 | |
| 306 | Shands Bridge | Mineral City | 1935 | |
| 307 | Utopia | SR 29 | 1935 | |
| 308 | Satsuma | Pomona | 1935 | |
| 309 | Parrish | SR 161 | 1935 | |
| 310 | SR 5 near Ellenton | Bay Shore Rd (US 541) | 1935 | |
| 311 | Venice | SR 5 near Englewood | 1935 | |
| 312 | SR 5 at Hillsborough River | SR 17 at Hillsbrough River | 1935 | |
| Highest number in the 1935 list | ||||
| 313 | SR 5 at Florida Ave, Tampa | SR 17 at Florida Ave | 1937 | |
| 314 | Tampa | SR 17 at Memorial Highway | 1937 | SR 60 |
| 315 | Plant City | SR 18A near Myakka City | 1937 | |
| 316 | SR 17 at 22nd St, Tampa | SR 5 at 22nd St. | 1937 | |
| 317 | N of Olga Bridge | W to section line | 1937 | |
| 318 | Inverness | Pedro | 1937 | |
| 319 | Inverness | Red Level | 1937 | |
| 320 | Inverness | SR 225 near Carlson's Ferry | 1937 | |