| Business | Phone |
| Cerro Gordo County Assessor 220 N Washington Ave, Mason City 50401 | (641) 421-3065 |
| Cerro Gordo County Auditor 220 N Washington Ave, Mason City 50401 | (641) 421-3019 |
| Cerro Gordo County Treasurer 220 N Washington Ave, Mason City 50401 | (641) 421-3126 |
| Cerro Gordo Property Tax 220 N Washington Ave, Mason City 50401 | (641) 421-3035 |