Reference Data Rate Center Directory PLAINFIELD, IA Rate Center PLAINFIELD — IA Data last updated: March 10, 2026 LATA 635 State IA Area Codes 1 Exchanges (NXX) 1 Carriers 1 Coordinates 42.84477358743893, -92.53538625303091 Area Codes 319 Top Carriers Carrier OCN NXX Count BUTLER-BREMER MUTUAL TEL. CO. 1115 1
