airport is Marianna Municipal Airport, originally known as the Graham Air Base. Local and private airports also exist throughout the county. Major highways Interstate 10 is the main west-to-east interstate highway in the county, and runs along southern Jackson County for a length of 33 miles. It contains five interchanges within the county; US 231 (Exit 130), SR 276 (Exit 136), SR 71 (Exit 142), SR 69 (Exit 152), and CR 268 (Exit 158). US 90 was the main west-to-east highway in the county, until it was surpassed by I-10. US 231 is the sole south-to-north U.S. highway running through the western part of the county. State Road 2 is the west to east route that's closest to the Alabama border. State Road 69 is a south-to-north state highway that enters from Calhoun County north of Ocheesee. North of the interchange with I-10, it passes through Grand Ridge, Dellwood, Two Egg, and finally terminates at SR 71 in Greenwood, across from the eastern terminus of Jackson County Road 162. State Road 71 is a south-to-north highway that enters the county from Altha in Calhoun County. North of the interchange with I-10, it has a westbound overlap with US 90 for approximately 1.7 miles, then branches off in a northeasterly direction. Curving north, it passes the Marianne Municipal Airport, then runs through Malone, only to curve to the northwest on its way to the Alabama State Line where it becomes AL 53. State Road 73 is a south-to-north highway that enters the county from Willis in Calhoun County. In Marianna, Florida it has a westbound overlap with US 90 which begins at the southern terminus of SR 166. then branches off in a northwesterly direction for 9 miles until finally terminating at US 231. State Road 77 is a south-to-north highway running through northwestern Jackson County from Chipley, Florida in Washington County. The road has an overlap with SR 2 in Graceville and terminates at the Alabama State Line where it becomes AL 109. State Road 166 is a short south to north state highway running through Marianna and a portion of rural Jackson County northeast of the city limits. State Road 273 is a south to north state highway running through northwestern Jackson County. State Road 276 exists primarily in Marianna, but has county extensions in both Washington and Jackson Counties. Railroads Jackson County has two railroad lines. The primary