| General Information | |
|---|---|
| Country | United States |
| State/Province | Iowa |
| Major City | Mason City |
| Time Zone | Central (UTC-06:00) |
| Current Local Time | 00:29 |
| Prefix | County | Primary City |
|---|---|---|
| 641-201 | Cerro Gordo | Mason City |
| 641-202 | Union | Creston |
| 641-203 | Lucas | Chariton |
| 641-204 | Marion | Pella |
| 641-205 | Marion | Knoxville |
| 641-207 | Keokuk | Keota |
| 641-208 | Davis | Bloomfield |
| 641-209 | Jefferson | Fairfield |
| 641-210 | Cerro Gordo | Mason City |
| 641-212 | Adair | Greenfield |
| 641-213 | Howard | Riceville |
| 641-216 | Appanoose | Centerville |
| 641-217 | Lucas | Chariton |
| 641-218 | Marion | Knoxville |
| 641-220 | Floyd | Charles City |
| 641-221 | Adair | Greenfield |
| 641-223 | Clarke | Osceola |
| 641-224 | Keokuk | Sigourney |
| 641-225 | Wapello | Eddyville |
| 641-226 | Wapello | Ottumwa |
| 641-227 | Jasper | Baxter |
| 641-228 | Floyd | Charles City |
| 641-229 | Chickasaw | New Hampton |
| 641-230 | Marion | Pella |
| 641-231 | Cerro Gordo | Clear Lake |
| 641-232 | Mahaska | Leighton |
| 641-233 | Jefferson | Libertyville |
| 641-234 | Ringgold | Mount Ayr |
| 641-235 | Howard | Riceville |
| 641-236 | Poweshiek | Grinnell |
| 641-237 | Howard | Riceville |
| 641-242 | Davis | Bloomfield |
| 641-243 | Cerro Gordo | Mason City |
| 641-247 | Adair | Fontanelle |
| 641-251 | Winnebago | Forest City |
| 641-257 | Floyd | Charles City |
| 641-259 | Jasper | Monroe |
| 641-260 | Poweshiek | Grinnell |
| 641-262 | Howard | Riceville |
| 641-264 | Mitchell | Little Cedar |
| 641-269 | Poweshiek | Grinnell |
| 641-275 | Jasper | Newton |
| 641-278 | Union | Creston |
| 641-289 | Decatur | Lamoni |
| 641-293 | Winnebago | Scarville |
| 641-295 | Mahaska | Oskaloosa |
| 641-297 | Warren | Prole |
| 641-298 | Winnebago | Thompson |
| 641-308 | Howard | Riceville |
| 641-309 | Howard | Riceville |