| Business | Phone |
| Town Of Darien-Darien Senior 30 Edgerton St, Darien 6820 | (203) 655-1636 |
| Darien Administrative Officer 2 Renshaw Rd, Darien 6820 | (203) 656-7333 |
| Darien Assessor's Office 2 Renshaw Rd, Darien 6820 | (203) 656-7310 |
| Darien Building Official 2 Renshaw Rd, Darien 6820 | (203) 656-7347 |
| Darien Dog Warden Darien 6820 | (203) 655-8686 |
| Darien Registrar Of Voters 2 Renshaw Rd, Darien 6820 | (203) 656-7316 |
| Darien Selectmen's Office 2 Renshaw Rd, Darien 6820 | (203) 656-7338 |
| Darien Sewer Commission 2 Renshaw Rd, Darien 6820 | (203) 656-7331 |
| Darien Tree Warden 112 5 Mile River Rd, Darien 6820 | (203) 655-5151 |
| Darien Youth Commission 2 Renshaw Rd, Darien 6820 | (203) 656-7326 |