A 57.57 mile long route, State Road 21 joins Jacksonville with the Clay County suburbs, Middleburg, Keystone Heights and SR 20 between Hawthorne and Interlachen. Through Putnam and the southern notch of Bradford County, SR 21 constitutes a rural two lane highway. Navigating along a winding course north of Melrose, SR 21 passes between Santa Fe Lake and Lake Geneva into the city of Keystone Heights. Angling northeast from SR 100, SR 21 crosses Lake Brooklyn ahead of Gold Head Branch State Park and Camp Blanding Joint Training Center.
SR 21 intersects SR 16 west of Penney Farms. Continuing north, SR 21 runs along the east side of the Satsuma Tract of Belmore State Forest to Blanding Boulevard and outer reaches of Middleburg. Blanding Boulevard constitutes a major commuting corridor northward to Lakeside, Bellair-Meadowbrook Terrace and Interstate 295 at Arygle Forest in Jacksonville. Within the Jacksonville Beltway, SR 21 (Blanding Boulevard) extends to U.S. 17 (Roosevelt Boulevard) and Park Street at Avondale.
Florida State Road 21 Guides
 scenes |
 | Vintage Florida Keys shield at the intersection of Main Street and SR 21 (Blanding Boulevard) in Middleburg. The assembly was date stamped on October 28, 1966. 05/27/17 |
 | CR 21B (Taylor Avenue) angles southeast from Kingswood Avenue and the Ridgewood community back to SR 21 (Blanding Boulevard). This shield assembly was date stamped on September 25, 1968. 07/28/18 |
 | SR 21 (Blanding Boulevard) travels southwest from CR 21B (Taylor Avenue) to Middleburg and northeast to CR 224 (College Drive) nearby. This shield assembly was also date stamped on September 25, 1968. 07/28/18 |
Photo Credits:
05/27/17, 07/28/18 by AARoads
Connect with:
Interstate 295 - East and West Beltway
U.S. 17
State Road 16
State Road 20
State Road 23 - First Coast Expressway
State Road 26
State Road 100
State Road 111
State Road 128
State Road 134
State Road 224 - Kingsley Avenue
Clay County Road 218
Page Updated 10-24-2022.