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Layers
Territory
- officials recorded 2
- partly recorded 3
- nothing recorded 13
- GEOID
- 34021
- OCD-ID
- ocd-division/country:us/state:nj/county:mercer
- POP
- 399,289 (2025)
- CENTER
- 40.2834, -74.7018
- SOURCE
- census tiger
Government of Mercer
Bodies, seats, agencies and services that belong to Mercer itself. Jurisdictions inside it are listed separately below.
Organization 27
Departments
-
Clerk to the Board of County Commissioners Legislative
Liaison between the Commissioners and the public; prepares meeting materials, resolutions and ordinances. Room 217, McDade Administration Building; office hours 8:30 a.m. to 4:30 p.m. weekdays.
609-989-6583 www.mercercounty.org -
Schedules court hearings for persons committed to psychiatric hospitals and investigates residency and ability to pay under N.J.S.A. 30:4-34.
609-989-6664 www.mercercounty.org -
Department of Human Resources Human Resources
Recruitment, employee relations, compensation and benefits, training and labor relations for Mercer County government.
609-989-6676 www.mercercounty.org -
Department of Human Services Human Services
Funds community-based organizations serving Mercer County residents through offices on addiction services, aging and disability, food security, homeless services, LGBTQIA+ affairs, mental health and youth services.
609-989-6526 www.mercercounty.org -
Department of Purchasing Finance
Procures goods and services by quote, bid or request for proposal under the New Jersey Local Public Contracts Law; solicitations are posted on BidNet Direct.
609-989-6710 www.mercercounty.org -
Department of Transportation and Infrastructure Public Works
County roads and bridges (Engineering and Highway divisions) and mosquito control.
609-530-7500 www.mercercounty.org -
Handles consumer complaints under the NJ Consumer Fraud Act (home improvement contractors, used-car dealers and others) and certifies commercial weighing and measuring devices.
609-989-6671 www.mercercounty.org -
Government arm of the Cultural and Heritage Commission: arts and history grants, festivals and exhibitions.
609-278-2712 www.mercercounty.org -
Division of Public Health Health
Public health information, emergency preparedness and environmental health for Mercer County.
609-278-7165 www.mercercounty.org -
Keeps accounting records, prepares the Annual Financial Statement and annual budget, processes vendor payments and payroll, and arranges long-term capital project financing.
609-989-6694 www.mercercounty.org -
Housing & Community Development Housing
Housing and community development programs, foreclosure assistance, and the Low-Income Home Energy Assistance Program (LIHEAP).
609-337-0933 www.mercercounty.org -
Mercer County Board of Taxation Assessment
Certifies property tax assessments; produces the Abstract of Ratables and the Equalization Table; hears property tax assessment appeals.
609-989-6704 www.mercercounty.org -
Files and records documents concerning real estate ownership and transfer; registers small business trade names; accepts U.S. passport applications; issues County and Veteran ID cards; swears in notaries; prints ballots and issues vote-by-mail ballots.
-
Short-term jail on Route 29 North (1750 River Road), Hopewell Township, with bed space for 871 inmates.
609-397-7460 www.mercercounty.org -
Mercer County Park Commission Parks & Recreation
County parks and facilities, nature center, stables, wildlife center, tennis center, golf courses, Howell Living History Farm and marina.
-
609-989-6351 mercercountyprosecutor.com
-
Serves warrants on behalf of the courts, apprehends fugitives, conducts sheriff's foreclosure sales and civil process.
-
Handles probate of wills, administration of estates, guardianships, adoptions and estate accountings.
609-989-6331 www.mercercounty.org -
Office of County Counsel Legal
Legal counsel for the County Executive and all County departments, and for the County Clerk, Prosecutor, Sheriff and Surrogate.
609-989-6511 www.mercercounty.org -
Office of Economic Development and Sustainability Economic Development
Economic development incentives and programs, small business development and business resources.
609-989-6555 www.mercercounty.org -
Office of Emergency Management Emergency Management
Plans for and coordinates response to natural and man-made disasters.
609-281-7228 www.mercercounty.org -
Office of the County Executive Administration
Exercises executive leadership of Mercer County government.
609-989-6518 www.mercercounty.org -
One-Stop Career Center Workforce
Partnership providing services to job seekers and employers. Hours Monday-Friday 8:30am-4:30pm.
609-989-6523 www.mercercounty.org -
Planning Department Planning
County land use planning, farmland and open space preservation, land development review, transportation planning and water resource planning.
609-989-6545 www.mercercounty.org -
Superintendent of Elections Elections
Acts as the county's Commissioner of Registration and custodian of voting machines; the Superintendent is appointed by the Governor for a five-year term.
609-989-6750 www.mercercounty.org -
Trenton-Mercer Airport Transportation
-
Veteran Services Human Services
Counsel, information and referral for Mercer County veterans and their families: VA claims, burial registration, survivor benefits, housing referrals.
609-989-6120 www.mercercounty.org
Services 16
- Apply for a U.S. Passport Mercer County Clerk's Office
- Apply for County Jobs Department of Human Resources
- Apply for Home Energy Assistance (LIHEAP) Housing & Community Development
- File a Consumer Complaint Division of Consumer Affairs / Weights & Measures
- File an OPRA Public Records Request Clerk to the Board of County Commissioners
- File a Property Tax Assessment Appeal Mercer County Board of Taxation
- Mosquito Control Inspection Request Department of Transportation and Infrastructure
- Picnic Area and Campground Rentals Mercer County Park Commission
- Probate a Will Mercer County Surrogate's Court
- Register a Business Trade Name Mercer County Clerk's Office
- Register for Bid Notifications Department of Purchasing
- Register for Emergency Notifications (Alert Mercer) Office of Emergency Management
- Report a Pothole Department of Transportation and Infrastructure
- Search Assessment and Tax Records Mercer County Board of Taxation
- Search Recorded Land Records Mercer County Clerk's Office
- Submit an Anonymous Tip Mercer County Prosecutor's Office
Within Mercer
Each of these governs itself. Counts are that jurisdiction's own records.
- jurisdictions
- 18
- agencies
- 34
- bodies
- 6
- officials
- 22
| Name | Agencies | Bodies | Officials |
|---|---|---|---|
| Trenton | 2 | 1 | 0 |
| Princeton | 4 | 1 | 7 |
| Hightstown | 11 | 2 | 15 |
| Pennington | 8 | 0 | 0 |
| Hopewell | 9 | 2 | 0 |
| Groveville | 0 | 0 | 0 |
| Hamilton Square | 0 | 0 | 0 |
| Lawrenceville | 0 | 0 | 0 |
| Mercerville | 0 | 0 | 0 |
| Princeton Junction | 0 | 0 | 0 |
| Robbinsville Center | 0 | 0 | 0 |
| The College of New Jersey | 0 | 0 | 0 |
| Titusville | 0 | 0 | 0 |
| Twin Rivers | 0 | 0 | 0 |
| Washington Crossing | 0 | 0 | 0 |
| White Horse | 0 | 0 | 0 |
| Windsor | 0 | 0 | 0 |
| Yardville | 0 | 0 | 0 |