| Business | Phone |
| Pennington County Assessor 101 Main Ave N, Thief River Fls 56701 | (218) 683-7029 |
| Pennington County Auditor 101 Main Ave N, Thief River Fls 56701 | (218) 683-7000 |
| Pennington County Treasurer 101 Main Ave N, Thief River Fls 56701 | (218) 683-7022 |