| Business | Phone |
| Water District 20 Watershed Ln, Chelmsford 1824 | (978) 256-2381 |
| Sewer Commission 50 Billerica Rd, Chelmsford 1824 | (978) 250-5233 |
| Chelmsford Building Inspector 50 Billerica Rd, Chelmsford 1824 | (978) 250-5225 |
| Chelmsford City Engineer 50 Billerica Rd, Chelmsford 1824 | (978) 250-5228 |
| Chelmsford Health Board 50 Billerica Rd, Chelmsford 1824 | (978) 250-5241 |
| Chelmsford Planning Board 50 Billerica Rd, Chelmsford 1824 | (978) 250-5231 |
| Chelmsford Recreational Comm 1 North Rd # A, Chelmsford 1824 | (978) 250-5262 |
| Chelmsford Recreational Comm 50 Billerica Rd, Chelmsford 1824 | (978) 250-5262 |
| Chelmsford Recycling Waste 50 Billerica Rd # Ll6, Chelmsford 1824 | (978) 250-5203 |
| Chelmsford Selectman 50 Billerica Rd, Chelmsford 1824 | (978) 250-5201 |
| Chelmsford Town Accountant 50 Billerica Rd, Chelmsford 1824 | (978) 250-5215 |
| Chelmsford Town Of Southrow 250 Boston Rd, Chelmsford 1824 | (978) 244-9367 |
| Chelmsford Town Office 230 North Rd, Chelmsford 1824 | (978) 244-8355 |
| Chelmsford Town Personnel Ofc 50 Billerica Rd, Chelmsford 1824 | (978) 250-5288 |
| Chelmsford Town Purchasing 50 Billerica Rd, Chelmsford 1824 | (978) 250-5289 |
| Chelmsford Town Veterans Agent 1a North Rd, Chelmsford 1824 | (978) 250-5238 |
| Chelmsford Twn Data Processing 50 Billerica Rd, Chelmsford 1824 | (978) 250-5204 |
| Chelmsford Water District 20 Watershed Ln, Chelmsford 1824 | (978) 256-2931 |