The Southeastern  Regional Transportation Planning Organization (SERTPO) is an agency tasked with coordinating transportation planning endeavors in the southeastern area of Oklahoma.

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SERTPO provides services to the counties listed below:

Garvin, Pontotoc, Murray, Carter, Coal, Love, Marshall, Johnston, Atoka, Bryan, Choctaw, Pushmataha, Pittsburg, Haskell, Latimer, Le Flore, McCurtain