Reference Data Rate Center Directory GRANDFIELD, OK Rate Center GRANDFIELD — OK Data last updated: March 10, 2026 LATA 536 State OK Area Codes 1 Exchanges (NXX) 1 Carriers 1 Coordinates 34.22924356975781, -98.6839870450411 Area Codes 580 Top Carriers Carrier OCN NXX Count PIONEER TEL. COOP., INC. 2018 1
