# Alabama State Route 21

State Route 21 (SR 21) is a 279-mile (449 km) state highway that extends from the Florida state line, near Atmore in Escambia County to Piedmont in Calhoun County. The route travels almost the entire length of the state from the northeast to the southwest. It is the longest signed state route in Alabama.

## Route description

Starting at the northern terminus of Florida State Road 97 at the Florida state line south of Atmore, the route travels north through Atmore, passing under an intersection with Interstate 65 at exit 57, then enters Monroe County and travels northeast through Frisco City and Monroeville and is concurrent with SR 47 for part of this section. SR 21 then once again becomes a standalone route passing through Beatrice and Oak Hill. In Lowndes County, SR 21 begins its first concurrency with US 80, and the two highways enter Montgomery, the state capital, from the southwest. SR 21 then diverges northeastward from US 80 for a short concurrency with US 31, then travels concurrently with US 80 once again (as well as US 82) around the Montgomery city center, diverging from US 82 at US 231 and traveling concurrently with US 231 northward to Sylacauga at an interchange with US 280. From Sylacauga, SR 21 turns northeastward toward Talladega. The route travels close to the Talladega National Forest and the Talladega Superspeedway. From here, SR 21 continues generally northeastward through the cities of Oxford, Anniston, and Jacksonville before terminating at an intersection with U.S. Highway 278 in Piedmont. The route is paved throughout and often multi-lane.

## Major intersections

| County | Location | mi | km | Destinations | Notes |
| Escambia | Atmore | 0.000 | 0.000 | SR 97 south – Pensacola | Florida state line |
| Escambia | Atmore | 1.888 | 3.038 | US 31 (Nashville Avenue / SR 3) – Mobile, Brewton | |
| Escambia | Freemanville | 8.122 | 13.071 | I-65 – Mobile, Montgomery | I-65 exit 57 |
| Monroe | Uriah | 22.372 | 36.004 | SR 59 south – Stockton, Upper Delta Wildlife Management Area | Northern terminus of SR 59 |
| Monroe | Frisco City | 33.680 | 54.203 | SR 21 Truck north (Bowden Street) / CR 18 (Wild Fork Road) | |
| Monroe | Frisco City | 34.080 | 54.846 | SR 21 Truck south (Highway 21 By-Pass) | |
| Monroe | ​ | 38.087 | 61.295 | US 84 / SR 41 south / SR 47 Truck south (SR 12) – Grove Hill, Evergreen, Conecuh County | Southern end of SR 41/SR 47 Truck concurrency |
| Monroe | Ollie | 38.517 | 61.987 | SR 136 east to I-65 north | Western terminus of SR 136 |
| Monroe | Monroeville | 40.864 | 65.764 | SR 21 Bus. north / SR 41 north (South Alabama Avenue) – Old Courthouse Museum | Northern end of SR 41 concurrency |
| Monroe | Monroeville | 43.128 | 69.408 | SR 21 Bus. south / SR 47 south (Pineville Road) / SR 47 Truck ends – Monroeville | Southern end of SR 47 concurrency; northern end of SR 47 Truck concurrency (it ends at this intersection) |
| Monroe | Beatrice | 59.336 | 95.492 | SR 265 north (Bryan Street) – Vredenburgh, Camden | Southern terminus of SR 265 |
| Monroe | Riley | 64.357 | 103.573 | SR 47 north – Greenville | Northern end of SR 47 concurrency |
| Wilcox | Oak Hill | 78.965 | 127.082 | SR 10 – Camden, Greenville | |
| Wilcox | ​ | 84.111 | 135.364 | SR 28 west – Camden | Eastern terminus of SR 28 |
| Wilcox | Elm Bluff | 85.183 | 137.089 | SR 89 north – Selma | Southern terminus of SR 89 |
| Lowndes | ​ | 102.222 | 164.510 | SR 263 south / CR 7 north – Greenville | Northern terminus of SR 263 |
| Lowndes | Hayneville | 120.503 | 193.931 | SR 97 (Commerce Street) – Lowndesboro, Letohatchee | |
| Lowndes | ​ | 127.864 | 205.777 | US 80 west (SR 8) – Selma | Southern end of US 80/SR 8 concurrency |
| Montgomery | Montgomery | 138.043 | 222.159 | US 31 south (SR 3) / US 80 east (SR 8) to I-65 – Mobile, Hope Hull | Interchange; southern end of US 31/SR 3 concurrency; northern end of US 80/SR 8 concurrency |
| Montgomery | Montgomery | 139.276 | 224.143 | US 31 north (West Boulevard / SR 3) / Selma-Mobile Highway – H. Councill Trenholm State Technical College | Northern end of US 31/SR 3 concurrency |
| Montgomery | Montgomery | 139.836 | 225.044 | I-65 / US 80 west / US 82 west (SR 6 west / SR 8 west) to I-85 – Birmingham, Atlanta, Selma, Mobile, Tuscaloosa | I-65 exit 168; southern end of US 80/US 82/SR 6/SR 8 concurrency |
| Montgomery | Montgomery | 141.419 | 227.592 | US 331 south (Court Street / SR 9) – Luverne | Northern terminus of US 331; southern end of SR 9 concurrency |
| Montgomery | Montgomery | 145.315 | 233.862 | US 82 east / US 231 south (Troy Highway / SR 6 east / SR 53 south) – Union Springs, Troy, Ozark, Dothan, H. Councill Trenholm State Technical College | northern end of US 82/SR 6 concurrency; southern end of US 231/SR 53 concurrency |
| Montgomery | Montgomery | 148.423 | 238.864 | I-85 / US 80 east (SR 8 east) to I-65 – Montgomery, Atlanta, Tuskegee | I-85 exit 6; north end of US 80/SR 8 concurrency |
| Montgomery | Montgomery | 149.8 | 241.1 | Atlanta Highway - Faulkner University | Interchange; former US 80 east/SR 8 east |
| Montgomery | Montgomery | 152.883 | 246.041 | To I-65 (via SR 152 west) / Congressman William L. Dickinson Drive – Birmingham, Mobile, Airport, Maxwell AFB Gunter Annex, Alabama National Guard Headquarters | Interchange |
| Elmore | Wetumpka | | | To SR 111 / South Main Street | South end of SR 111 Truck concurrency |
| Elmore | Wetumpka | 163.340 | 262.870 | SR 170 east – Tallassee | Western terminus of SR 170 |
| Elmore | Wetumpka | | | Company Street – Downtown Wetumpka Historical District | Former SR 14 west |
| Elmore | Wetumpka | 163.681 | 263.419 | SR 14 / SR 111 Truck north (Coosa River Parkway / Tallassee Highway) – Prattville, Tallassee, Wetumpka Sports Complex | North end of SR 111 Truck concurrency |
| Elmore | Wetumpka | 164.428 | 264.621 | SR 9 north (Central Plank Road) – Santuck, Central | Northern end of SR 9 concurrency; southern end of signed portion of SR 9 |
| Coosa | Rockford | 188.890 | 303.989 | SR 22 | |
| Talladega | Sylacauga | 207.585 | 334.076 | US 231 north / US 280 (SR 38 / SR 53) – Airport | Interchange; northern end of US 231/SR 53 concurrency |
| Talladega | Sylacauga | 209.581 | 337.288 | SR 148 east (3rd Street) | Western terminus of SR 148 |
| Talladega | Winterboro | 220.745 | 355.255 | SR 76 west | Eastern terminus of SR 76 |
| Talladega | Talladega | 230.454 | 370.880 | SR 77 north (East Street) – Talladega Superspeedway, International Motorsports Hall of Fame | Southern end of SR 77 concurrency |
| Talladega | Talladega | 231.631 | 372.774 | SR 77 south (Haynes Street) – Central Alabama Community College | Northern end of SR 77 concurrency |
| Talladega | Oxford | 250.915 | 403.809 | I-20 – Birmingham, Atlanta | I-20 exit 185 |
| Talladega | Oxford | 251.266 | 404.373 | US 78 (Hamric Drive / SR 4) – Heflin | |
| Calhoun | Anniston | 254.373 | 409.374 | SR 202 west | Eastern terminus of SR 202 |
| Calhoun | Anniston | 257.596 | 414.561 | US 431 (Anniston Eastern Bypass / SR-1) | Trumpet/cloverleaf interchange |
| Calhoun | Jacksonville | 267.730 | 430.870 | SR 204 west (Nisbet Street NW) – Angel, Crystal Springs | Eastern terminus of SR 204 |
| Calhoun | Piedmont | 279.471 | 449.765 | US 278 – Gadsden, Cedartown, | Northern terminus of SR 21; Formerly an alignment of SR 200 |
| 1.000 mi = 1.609 km; 1.000 km = 0.621 mi ||||||

## Special routes
### Major intersections

The entire route is in Monroe County.
| Location | mi | km | Destinations | Notes |
| Monroeville | 0.00 | 0.00 | SR 21 / SR 41 south | Southern terminus; southern end of SR 41 concurrency |
| Monroeville | 2.2 | 3.5 | SR 47 south | Southern end of SR 47 concurrency |
| Monroeville | 2.5 | 4.0 | SR 41 north | Northern end of SR 41 concurrency |
| Monroeville | 3.2 | 5.1 | SR 21 / SR 47 north / SR 47 Truck south | Northern terminus; northern end of SR 47 concurrency; northern terminus of SR 47 Truck |
| 1.000 mi = 1.609 km; 1.000 km = 0.621 mi Concurrency terminus |||||

### Major intersections

The entire route is in Frisco City, Monroe County.
| mi | km | Destinations | Notes |
| 0.00 | 0.00 | SR 21 | Southern terminus |
| 0.5 | 0.80 | SR 21 | Northern terminus |
| 1.000 mi = 1.609 km; 1.000 km = 0.621 mi ||||