| Route | From | To | Dates | Now |
| 381 | Cocoa | Holopaw | 1937-1945 | Fiske Blvd; Rest of road never built |
| 382 | St. Cloud | Lake Wales | 1937 | |
| 383 | Macclenny | Maxville | 1937 | |
| 384 | High Springs | SR 82 in Gilchrist Co. | 1937 | |
| 385 | Micanopy | Raleigh | 1937 | |
| 386 | Jennings | Ellaville | 1937 | |
| 387 | Jennings | Live Oak | 1937 | |
| 388 | Jasper | Nobles Ferry Bridge | 1937 | |
| 389 | Jennings | SR 116 at Withlacoochee River | 1937 | |
| 390 | Jennings | SR 50 N of Jasper | 1937 | |
| Last route of the 1937 numbering | ||||
| 391 | McCall | Placida | 1939 | |
| 392 | SR 5 N of intersectoion with SR 210 | Weekiwachee Springs | 1939 | |
| 393 | St. Petersburg | SR 233 across Boca Ciga Bay | 1939 | |
| 394 | SR 140 E of Hallandale | SR 149 | 1939 | |
| 395 | Boca Raton | SR 199 | 1939 | |
| 396 | Boca Raton | SR 199 | 1939 | Camino Real |
| 397 | SR 22 | SR 2 | 1939 | |
| 398 | Old SR 2 | Seminole Co. line | 1939 | |
| 399 | County Proj. No. 2 | Maitland | 1939 | |
| 400 | County Proj. No. 1 | Old SR 2 | 1939 | |