Zone 1 – Southwest Arkansas. Start at the northwest corner of Sevier County; south on the Arkansas-Oklahoma state line to the Red River; east on the Red River following the Arkansas-Texas state line coinciding with the southern boundary of Little River County; south on the Arkansas-Texas state line to the Louisiana state line; east on the Arkansas-Louisiana state line to the southeast corner of Lafayette County; north on the Lafayette-Columbia county line to the Nevada county line; west on the Lafayette-Nevada county line to the Hempstead county line; north on the Hempstead-Nevada county line to the Pike county line; west on the Pike-Hempstead county line to the Howard county line; north on the Howard-Pike county line to U.S. Highway 70; west on U.S. Highway 70 to the Saline River; north on the Saline River to the northeast corner of Sevier County; west on the Sevier-Howard county line to the Polk Ccounty line; west on the Polk-Sevier county line to the Arkansas-Oklahoma state line.

Zone 2 – South-Central Arkansas. Start at the southwest corner of Columbia County on the Arkansas-Louisiana state line; east on the Arkansas-Louisiana state line to Arkansas Highway275; north on Arkansas Highway 275 to U.S. Highway 63; north on U.S. Highway 63 to U.S. Highway 79; north on U.S. Highway 79 to the White River; north on the White River to Interstate 40; west on Interstate 40 to Interstate 440; east on Interstate 440 to U.S. Highway 67; north on U.S. Highway 67 to U.S. Highway 64; west on U.S. Highway 64 to Interstate 40; west on Interstate 40 to Arkansas Highway 27; south onArkansas Highway 27 to Arkansas Highway 10; east on Arkansas Highway 10 to Arkansas Highway 9; south on Arkansas Highway 9 to Arkansas Highway 5; north on Arkansas Highway 5 to Interstate 30; west on Interstate 30 to U.S. Highway 70; west on U.S. Highway 70 to the Pike-Howard county line; south on the Pike-Howard county line to the Hempstead county line; east on the Hempstead-Pike county line to the Nevada county line; south on the Nevada-Hempstead county line to the Lafayette county line; south on the Lafayette-Nevada county line to the southwest corner of Nevada County; east on the Lafayette-Nevada county line to the Columbia county line; south on the Columbia-Lafayette county line to the Arkansas-Louisiana state line.

Zone 3 – Southeast Arkansas. Start at the intersection of Arkansas Highway 275 and the Arkansas-Louisiana state line (Union County); east on the Arkansas-Louisiana state line to the Mississippi River; north on the Arkansas-Mississippi state line to U.S. Highway 49; north on U.S. Highway 49 to U.S. Highway 79; south on U.S. Highway 79 to U.S. Highway 63; south on U.S. Highway 63 to Arkansas Highway 275; south on Arkansas Highway 275 to the Arkansas-Louisiana state line.

Zone 4 – Northeast Arkansas. Start at the junction of Interstate 40 and Interstate 440 (Pulaski County); east on Interstate 40 to the White River; south on the White River to U.S. Highway 79; north on U.S. Highway 79 to U.S. Highway 49; south on U.S Highway 49 to the Mississippi River; north on the Arkansas-Mississippi state line to the Tennessee state line; north on the Arkansas-Tennessee state line to the Missouri state line; west on the Arkansas-Missouri state line to the St. Francis River; south on the St. Francis River to the Craighead county line; west on the Craighead-Greene county line to the Lawrence county line; south on the Lawrence-Craighead county line to the Jackson county line; west on the Jackson-Lawrence county line to U.S. Highway 67; south on U.S. Highway 67 to the Jackson-White county line; west on the Jackson-White county line to the Independence county line; west on the Independence-White county line to the Cleburne county line; south on the Cleburne-White county line to the Faulkner county line; south on the Faulkner-White county line to U.S. Highway 64; east on U.S. Highway 64 to U.S. Highway 67; south on U.S. Highway 67 to Interstate 440; east on Interstate 440 to Interstate 40.

Zone 5 – Northwest Arkansas. Start at the northwest corner of Sevier County on the Arkansas-Oklahoma state line; east on the Sevier-Polk county line to the Howard county line; east on the Howard-Sevier county line to the Saline River; the south on the Saline River to U.S. Highway 70; east on U.S. Highway 70 to Interstate 30; east on Interstate 30 to Arkansas Highway 5; south on Arkansas Highway 5 to Arkansas Highway 9; north on Arkansas Highway 9 to Arkansas Highway 10; west on Arkansas Highway 10 to Arkansas Highway 27; north on Arkansas Highway 27 to Interstate 40; east on Interstate 40 to U.S. Highway 64; east on U.S. Highway 64 to the Faulkner-White county line; north on the Faulkner-White county line to the Cleburne county line; east on the Cleburne-White county line to the Independence county line; east on the Independence-White county line to the Jackson county line; south on the Jackson-White county line to U.S. Highway 67; the north on U.S. Highway 67 to the Jackson-Lawrence county line; east on the Jackson-Lawrence county line to the Craighead county line; east on the Craighead-Lawrence county line to the Greene county line; east on the Greene-Craighead county line to the St. Francis River; north on the St. Francis River to the Missouri state line; north on the Arkansas-Missouri state line to the northeast corner of Clay County; west on the Arkansas-Missouri state line to the Arkansas-Oklahoma state line; south on the Arkansas-Oklahoma state line to the northwest corner of Sevier County.