Reference Data Rate Center Directory CALUMET, OK Rate Center CALUMET — OK Data last updated: March 10, 2026 LATA 536 State OK Area Codes 1 Exchanges (NXX) 1 Carriers 1 Coordinates 35.60026290193191, -98.11940290178146 Area Codes 405 Top Carriers Carrier OCN NXX Count PIONEER TEL. COOP., INC. 2018 1
