| Business | Phone |
| Montclair Building Dept 205 Claremont Ave, Montclair 7042 | (973) 509-4951 |
| Montclair Construction Offcl 205 Claremont Ave, Montclair 7042 | (973) 509-4949 |
| Montclair Council 205 Claremont Ave, Montclair 7042 | (973) 509-4928 |
| Montclair Finance 205 Claremont Ave, Montclair 7042 | (973) 509-4962 |
| Montclair Manager 205 Claremont Ave, Montclair 7042 | (973) 509-4926 |
| Montclair Municipal Building 205 Claremont Ave, Montclair 7042 | (973) 744-1400 |
| Montclair Personnel 205 Claremont Ave, Montclair 7042 | (973) 509-4938 |
| Montclair Planning 205 Claremont Ave, Montclair 7042 | (973) 509-4954 |
| Montclair Purchasing 205 Claremont Ave, Montclair 7042 | (973) 509-4982 |
| Montclair Shade Tree Dept 205 Claremont Ave, Montclair 7042 | (973) 509-4985 |
| Montclair Twp Clerk 205 Claremont Ave, Montclair 7042 | (973) 509-4901 |
| Montclair Water Bureau 219 N Fullerton Ave, Montclair 7042 | (973) 744-4600 |
| Montclair Water Bureau 54 Watchung Ave, Montclair 7043 | (973) 744-4600 |
| Montclair Water Collections 205 Claremont Ave, Montclair 7042 | (973) 509-4925 |
| Municipal Offices Glen Ridge 1 Woodland Ave, Montclair 7042 | (973) 509-5362 |