| Business | Phone |
| Wastewater Alternatives Inc 37 Champney St, Groton 1450 | (978) 448-2415 |
| Trust Funds 173 Main St, Groton 1450 | (978) 448-1173 |
| Building Inspector 173 Main St, Groton 1450 | (978) 448-1109 |
| Groton Electric Dept 23 Station Ave, Groton 1450 | (978) 448-1150 |
| Groton Selectman 173 Main St, Groton 1450 | (978) 448-1111 |
| Groton Squannacook Hall 163 W Main St, Groton 1450 | (978) 448-1125 |
| City Accountant 173 Main St, Groton 1450 | (978) 448-1107 |
| City Wastewater 173 Main St, Groton 1450 | (978) 448-1117 |
| Recycling Center Cow Pond Brook Rd, Groton 1450 | (978) 448-1160 |
| Planning Board 173 Main St, Groton 1450 | (978) 448-1105 |
| Health Board 173 Main St, Groton 1450 | (978) 448-1120 |
| Legion Hall 163 W Main St, Groton 1450 | (978) 448-1175 |