Length: 324 mi. Mississippi Highway 15 (MS 15), the longest highway in the state, begins in Biloxi, and ends near Walnut. The road is divided into two sections, passing through the counties of Harrison, Stone, Perry, Jones, Jasper, Newton, Neshoba, Winston, Choctaw, Webster, Oktibbeha, Chickasaw, Pontotoc, Union, and Tippah.
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