| Business | Phone |
| Jasper County Assessor 101 1st St N 105, Newton 50208 | (641) 792-6195 |
| Jasper County Auditor 101 1st St N 202, Newton 50208 | (641) 792-7016 |
| Jasper County Tax Dept 101 1st St N 102, Newton 50208 | (641) 792-7731 |
| Jasper County Treasurers Office 101 1st St N, Newton 50208 | (641) 792-6115 |