| Business | Phone |
| Appraisal Office 175 N 27th St, Billings 59101 | (406) 596-4000 |
| Yellowstone County Assessor 217 N 27th St # 108, Billings 59101 | (406) 256-2801 |
| Yellowstone County Auditor 217 N 27th St, Billings 59101 | (406) 256-2720 |
| Assessor-Legal Descriptions 217 N 27th St, Billings 59101 | (406) 256-2819 |
| Treasurer-Business Personal 217 N 27th St, Billings 59101 | (406) 256-2804 |
| Treasurer-County School Acctg 217 N 27th St, Billings 59101 | (406) 256-2808 |
| Treasurer-Mobile Home Taxes 217 N 27th St, Billings 59101 | (406) 256-2803 |
| Montana State Revenue 175 N 27th St # 14, Billings 59101 | (406) 256-2750 |