| Business | Phone |
| Fairfield Assessor's Office 230 Fairfield Rd, Fairfield 7004 | (973) 882-2717 |
| Fairfield Municipal Clerk 230 Fairfield Rd, Fairfield 7004 | (973) 882-4902 |
| Fairfield Twp Athletic Dir 221 Hollywood Ave, Fairfield 7004 | (973) 882-2750 |
| Fairfield Twp Cod Enforcement 230 Fairfield Rd, Fairfield 7004 | (973) 882-2730 |
| Fairfield Twp Council Office 230 Fairfield Rd, Fairfield 7004 | (973) 882-2707 |
| Fairfield Twp Engineering Div 230 Fairfield Rd, Fairfield 7004 | (973) 882-2725 |
| Fairfield Twp Municipal Adm 230 Fairfield Rd, Fairfield 7004 | (973) 882-2706 |
| Fairfield Twp Municipal Office 230 Fairfield Rd, Fairfield 7004 | (973) 882-2700 |
| Fairfield Twp Planning 230 Fairfield Rd, Fairfield 7004 | (973) 882-2729 |
| Fairfield Violations 230 Fairfield Rd, Fairfield 7004 | (973) 882-2715 |
| Two Bridges Sewerage Authority Fairfield Rd, Fairfield 7004 | (973) 575-9141 |
| Two Bridges Sewerage Authority Jane Rd, Fairfield 7004 | (973) 575-1284 |