Pre-1945 state roads 270-312

One useful source is a 1939 list published by the SRD. I had previously taken notes on all the laws, but this combines them in one handy booklet.

Note that many of the legislatively-defined routes were never built or never acquired by the state. This is especially true of higher numbers.

#	year	from	to	via (post-1945)
270	1935	140 in Sunny Isles Beach	26 northwest of Hialeah	826 (including former alignment on Northwest 170th Street west of Northwest 57th Avenue)
271	1935	4-A in Miami	4-A at Naranja	Southwest 37th Avenue/Ingraham Highway/Old Cutler Road/909 (now 989)/Southwest 268th Street
272	1935	26 in Miami	271 in Coral Gables	834 (now 948)/959
273	1935	219 south of Courtenay	140 north of Canaveral	Hall Road/unbuilt south of Courtenay to south of Canaveral A1A through Canaveral
274	1935	25 at Buckingham	164 south of LaBelle	861 (Buckingham Road)/Homestead Road/unbuilt
275	1935	2 at Freemont Street in Fort Myers	183 at Salvista	unbuilt (parallel to old railroad bridge)
276	1935	27 at Estero	Lee-Collier County line	850
277	1935	Georgia	Apalachicola	unbuilt Georgia to Chattahoochee 269/270 Chattahoochee to Rock Bluff 271 Rock Bluff to Hosford (now 1641) 65 Hosford to Beverly unbuilt/384 Beverly to Apalachicola
278	1935	Estero Island	27 near Biggar	865
279	1935	25 in Clewiston	25 east of Clewiston	832
280	1935	Micanopy	211 south of Phifer	346
281	1935	Glen Springs (Northwest 23rd Avenue at Northwest 23rd Boulevard)	Millhopper Road (Northwest 43rd Street)	232A/232 (now 222)
282	1935	99 north of Paradise	113 east of La Crosse	231
283	1935	2 south of Gainesville	65 near Rocky Point	23 (Rocky Point Road)
284	1935	Tallahassee	10 at Bradfordville	155/0342
285	1935	2 west of Pine Castle	29 south of Conway	528A (now 506)
286	1935	2 west of Taft	29 southeast of Conway	528 (using Landstreet Road west of 527)
287	1935	202 at Goldenrod	29 southeast of Conway	15A (now 551)
288	1935	202 in Oviedo	2 in Apopka	unbuilt Oviedo to Casselberry 436 Casselberry to Apopka
	defined only in Seminole County, west of 3 in Casselberry, in 1935; extended west to 2 in Orange County in 1937 and east from 3 to Oviedo in 1941
289	1935	Cross City	Horseshoe Beach	351 (partly 359 in 1945)
290	1935	2 north of Zellwood	2 south of Tavares	448
291	1935	11 near Monticello	Georgia	149
292	1935	2 north of Olga	25 south of Alva	78/Broadway Street
	extended south from Alva to 25 in 1937
293	1935	15 north of New Port Richey	210 east of Fivay	587A (now 524)/587
	defined in 1935 to begin on Massachusetts Avenue in New Port Richey (using 587 (now partly 587 Truck) all the way); moved north in 1937
294	1935	15 near Walsingham	Indian Rocks Beach	688
295	1935	Steward City	500 northwest of Cross City	358/359 (now all 358)
296	1935	22 east of Orlando	22 at Fort Christmas	420
297	1935	10 southeast of Panama City	Beacon Beach	local roads via Cromanton
298	1935	Westville	Alabama	179A
299	1935	5-A west of Fenholloway	500 west of Foley	30
300	1935	Ocala	Florida Industrial School for Girls	Fort King Street
301	1935	10 south of Metcalf Point	Alligator Point	370
302	1935	2 in Wauchula	63 east of Ona	661
303	1935	Carrabelle	Telogia	67
304	1935	194 near Upthegrove Beach	29 southeast of Okeechobee	15A
305	1935	4 in West Palm Beach	140 in Palm Beach	A1A
	also part of 140 (not sure about the north-south part)
306	1935	Orangedale	140 at Ponte Vedra Beach	210
307	1935	194 southeast of Upthegrove Beach	29 southeast of Okeechobee	15B
308	1935	Welaka	3 at Pomona	308B
	defined in 1935 from Satsuma to Pomona; Satsuma to Welaka became part of 261-A in 1941
309	1935	Piney Point (ferry to Pinellas Point)	161 at Manatee River	Piney Point Road/Buckeye Road/unbuilt Piney Point to Parrish 675 Parrish to Manatee River
310	1935	5 at Ellenton	23 west of Gillette	683
311	1935	Venice	5 southeast of Venice	770 east of Venice 777 east of Venice to Englewood 775 Englewood to southeast of Venice (now 776)
	former alignment of 5 through Englewood portion along 777 (West River Road) north of 5 added in 1937
312	1935	313 at Hillsborough River	17 at Hillsborough River	unbuilt