Reference Data Rate Center Directory ST OLAF, IA Rate Center ST OLAF — IA Data last updated: March 10, 2026 LATA 635 State IA Area Codes 1 Exchanges (NXX) 1 Carriers 1 Coordinates 42.92810487610268, -91.38691682069063 Area Codes 563 Top Carriers Carrier OCN NXX Count NORTHEAST IOWA TEL. CO. 1230 1
