Reference Data Rate Center Directory HARMON, OK Rate Center HARMON — OK Data last updated: March 10, 2026 LATA 536 State OK Area Codes 1 Exchanges (NXX) 1 Carriers 1 Coordinates 36.14451561494959, -99.56084800157366 Area Codes 580 Top Carriers Carrier OCN NXX Count PIONEER TEL. COOP., INC. 2018 1
