| Main Office | Telephone | FAX |
| 201-768-0167 | 201-768-2581 | |
| Mayor | Telephone | |
| Raymond Cywinski | 201-768-0167 ext. 40 | ray.cywinski@demarestnj.org |
| Council | Telephone | |
| Joseph Gray, Council President | 201-768-0167 ext. 10 | joe.gray@demarestnj.org |
| Blake Chroman | 201-768-0167 ext. 10 | blake.chroman@demarestnj.org |
| Ted Davis | 201-768-0167 ext. 10 | ted.davis@demarestnj.org |
| Mary Montagne | 201-768-0167 ext. 10 | mary.montagne@demarestnj.org |
| Steven Schliem | 201-768-0167 ext. 10 | steve.schliem@demarestnj.org |
| Steve Verp | 201-768-0167 ext. 10 | steve.verp@demarestnj.org |
| Department | Contact | Telephone | |
| Administrative Assistant | Jeanine Siek | 201-768-0167 ext.10 | jeanine.siek@demarestnj.org |
| Ambulance | 201-767-8050 | ||
| Board of Health Deputy Registrar |
Elise Wrede | 201-768-0167 ext.30 | elise.wrede@demarestnj.org |
| Borough Clerk - Registrar | Susan Crosman | 201-768-0167 ext.39 | susan.crosman@demarestnj.org |
| Building Department | Diane Larsen | 201-768-0167 ext.12 | diane.larsen@demarestnj.org |
| Demarest Senior Center | 201-767-9785 | ||
| Demarest Swim Club | 201-768-8182 | ||
| Department of Public Works | Robert DeTemple | 201-768-5439 | robert.detemple@demarestnj.org |
| Environmental Commission | Jeanine Siek | 201-768-0167 ext.10 | jeanine.siek@demarestnj.org |
| Fire Department (non-emergency) |
201-768-0338 | ||
| Fire Department Chief | Eric Marello | 201-768-0338 | emarello@truckkingintl.com |
| Garbage Collector | Miele Sanitation | 201-768-5407 | |
| Municipal Court | 201-768-1160 | ||
| Municipal Court Administrator | Antoinette Ceccon | 201-768-0167 ext.37 | |
| Office of Emergency Management | 201-768-1540 | ||
| Planning Board Administrator/MHL | Susan Crosman | 201-768-0167 ext.39 | susan.crosman@demarestnj.org |
| Police (non-emergency) | 201-768-1540 | ||
| Police Chief | James Powderley III | 201-768-0167 ext.18 | chief@demarestpd.org |
| Public Library | 201-768-8714 | ||
| Recreation Commission | 201-768-0167 ext.15 | ||
| Recycling | 201-768-6669 | ||
| Shade Tree Commission | Jeanine Siek | 201-768-0167 ext.10 | jeanine.siek@demarestnj.org |
| Summer Recreation Director | Jackie Sicheri | demarestsummerrec@demarestnj.org | |
| Tax Finance Office Tax Collector/CFO |
Maureen Neville | 201-768-3611 ext.17 | maureen.neville@demarestnj.org |
| Tax Finance Office Deputy Tax Collector/Treasurer |
Sadie Delihasani | 201-768-3611 ext.42 | sadie.delihasani@demarestnj.org |
| Zoning Board Secretary | Diane Larsen | 201-768-0167 ext.12 | diane.larsen@demarestnj.org |
| Zoning Officer | 201-768-0167 ext.14 |