| Business | Phone |
| New Marlborough Assessor 807 Mill River Southfield Rd, Mill River 1244 | (413) 229-8926 |
| New Marlborough Tax Collector 807 Mill River Southfield Rd, Mill River 1244 | (413) 229-8963 |
| New Marlborough Treasurer Southfield Rd, Mill River 1244 | (413) 229-8963 |