Florida State Road 100

State Road 100
Route information
Maintained by FDOT
Length:	151 mi (243.01 km)
Major junctions
South end:	SR A1A in Flagler Beach
	I-95 / SR 9 near Flagler Beach US 1 / SR 5 / SR 11 / SR 20 in Bunnell US 17 / SR 15 in San Mateo, Palatka US 301 / SR 200 in Starke US 90 / SR 10 in Watertown US 441 / SR 25A in Lake City US 41 / US 90 / SR 10 / SR 25 in Lake City I-10 / SR 8 near Lake City US 129 / SR 51 near Jasper US 41 / SR 6 / SR 25 in Jasper
North end:	US 129 / SR 11 at the Georgia state line
Highway system
Florida State Roads Interstate • US • SR (Pre-1945) • Toll ← US 98 SR 101 →

State Road 100 is a 151-mile-long northwest-southeast highway serving northeastern Florida. Its northwestern terminus is at the Georgia-Florida border four miles (6 km) north of Avoca, Florida (its continuation in Georgia is State Route 11); its southeastern terminus is an intersection with Shore Scenic Highway (SR A1A) in Flagler Beach. Some sections are signed north–south, while others are signed east–west.

Route description

Flagship Harbor Preserve from the State Road 100 Bridge

The northernmost eight miles (13 km) of SR 100 are signed (north–south) as US 129. For three miles (5 km) in Jasper, it merges with US 41(SR 25) before separating from US 129 (which has the hidden Florida Department of Transportation designation SR 51 between the split and Live Oak). Southeast of the split, SR 100 signage can be seen alongside the road, beside US 41 signs (hidden SR 25) north of Lake City and beside US 90 signs (hidden SR 10) along a two-mile-long stretch of East Duval Street in Lake City.

East of Lake City, SR 100 is signed east–west as it continues along a northwest-southeast pathway toward the Atlantic Ocean, serving, amongst other municipalities, Lake Butler, Starke, Keystone Heights, and Putnam Hall before merging with US 17 (hidden SR 15) on Reid Street in Palatka, just west of their bridge crossing at St. Johns River.

State Road 100 separates from US 17/SR 15 in San Mateo and continues in a more easterly direction through Shell Bluff Landing, Bimini, Bunnell (where SR 100 overlaps U.S. Route 1/SR 5 for a mile) and Palm Coast before it reaches SR A1A on the Atlantic coast.

Major junctions

County	Location	Mile	Destinations	Notes
	Flagler Beach		SR A1A	Southern terminus
			I-95 / SR 9
	Bunnell		US 1 / SR 5 / SR 11 / SR 20
	San Mateo		US 17 / SR 15
	East Palatka		SR 207
	Palatka		SR 20
			US 17 / SR 15
			SR 19
	Putnam		SR 26
	Keystone Heights		SR 21
	Starke		US 301 / SR 200
	Lake Butler		SR 121
			SR 231 / SR 238
	Watertown		SR 10A
			US 90 / SR 10
	Lake City		US 441 / SR 25A
			US 41 / US 90 / SR 10 / SR 25
			I-10 / SR 8
	White Springs		SR 136
			US 129 / SR 51
	Jasper		US 41 / SR 6 / SR 25
			US 129 / SR 11	Northern terminus