| Business | Phone |
| Dennis Town Accounting Dept 485 Main St, South Dennis 2660 | (508) 760-6153 |
| Dennis Town Assessing Dept 485 Main St, South Dennis 2660 | (508) 760-6139 |
| Dennis Town Clerk's Office 485 Main St, South Dennis 2660 | (508) 760-6112 |
| Dennis Town Disposal Area 100 Theophilis Smith Rd, South Dennis 2660 | (508) 760-6230 |
| Dennis Town Engineering Dept 120 Theo F Smith Rd, South Dennis 2660 | (508) 760-6166 |
| Dennis Town Harbormaster 485 Main St, South Dennis 2660 | (508) 760-6159 |
| Dennis Town Offices 485 Main St, South Dennis 2660 | (508) 394-8300 |
| Dennis Town Planning Dept 485 Main St, South Dennis 2660 | (508) 760-6119 |
| Dennis Town Selectmen 485 Main St, South Dennis 2660 | (508) 760-6148 |
| Dennis Water District 80 Old Bass River Rd, South Dennis 2660 | (508) 398-3351 |