County profile
399,289 residents · 2025 Census estimate
Latest available data
Reporting years differ because each source follows its own publication schedule.
Housing permits
Uses the 2024 Census population estimate.
Above the New Jersey value.
Permits are assigned to the issuing municipality and added to county totals.
Explore this measure →Municipal State Aid
Uses the 2025 Census population estimate.
Above the New Jersey value.
Aid is assigned to the municipality receiving the certified allocation.
Explore this measure →Unemployment
Above the New Jersey value.
Rates describe people in their county of residence.
Explore this measure →Transportation awards
Uses the 2025 Census population estimate.
Above the New Jersey value.
Awards are assigned to the government receiving them.
Explore this measure →Change over time
New Jersey figures use published source totals where available. Unemployment rates use labor-force counts. Local Aid totals include only awards assigned to counties.
Housing permits
| Year | Mercer | New Jersey |
|---|---|---|
| 2014 | Not available | Not available |
| 2015 | Not available | Not available |
| 2016 | Not available | Not available |
| 2017 | Not available | Not available |
| 2018 | Not available | Not available |
| 2019 | Not available | Not available |
| 2020 | 1.9 | 2.9 |
| 2021 | 1.1 | 3.2 |
| 2022 | 2.5 | 3.4 |
| 2023 | 1.9 | 2.3 |
| 2024 | 4.4 | 2.8 |
Municipal State Aid
| Year | Mercer | New Jersey |
|---|---|---|
| FY2019 | Not available | Not available |
| FY2020 | Not available | Not available |
| FY2021 | $269 | $156 |
| FY2022 | $272 | $156 |
| FY2023 | $283 | $164 |
| FY2024 | $295 | $171 |
| FY2025 | $265 | $154 |
| FY2026 | $263 | $153 |
| FY2027 | $263 | $153 |
Unemployment
| Year | Mercer | New Jersey |
|---|---|---|
| 1990 | 4.4% | 5.1% |
| 1991 | 5.7% | 6.8% |
| 1992 | 6.7% | 8.5% |
| 1993 | 6.0% | 7.8% |
| 1994 | 5.4% | 6.8% |
| 1995 | 5.4% | 6.4% |
| 1996 | 5.6% | 6.1% |
| 1997 | 4.7% | 5.3% |
| 1998 | 4.1% | 4.6% |
| 1999 | 3.8% | 4.4% |
| 2000 | 3.3% | 3.7% |
| 2001 | 3.7% | 4.2% |
| 2002 | 5.3% | 5.8% |
| 2003 | 5.2% | 5.8% |
| 2004 | 4.3% | 4.9% |
| 2005 | 3.9% | 4.4% |
| 2006 | 4.3% | 4.7% |
| 2007 | 3.8% | 4.2% |
| 2008 | 4.8% | 5.4% |
| 2009 | 7.4% | 8.9% |
| 2010 | 8.5% | 9.7% |
| 2011 | 8.3% | 9.4% |
| 2012 | 8.3% | 9.4% |
| 2013 | 7.4% | 8.4% |
| 2014 | 5.8% | 6.7% |
| 2015 | 4.9% | 5.7% |
| 2016 | 4.7% | 4.9% |
| 2017 | 4.4% | 4.5% |
| 2018 | 3.9% | 4.0% |
| 2019 | 3.4% | 3.5% |
| 2020 | 8.0% | 9.5% |
| 2021 | 6.1% | 6.7% |
| 2022 | 3.7% | 3.9% |
| 2023 | 4.2% | 4.3% |
| 2024 | 4.6% | 4.6% |
| 2025 | 5.3% | 5.2% |
Transportation awards
| Year | Mercer | New Jersey |
|---|---|---|
| FY2014 | Not available | Not available |
| FY2016 | Not available | Not available |
| FY2021 | $28 | $26 |
| FY2022 | $30 | $28 |
| FY2023 | $33 | $28 |
| FY2024 | $29 | $28 |
| FY2025 | $28 | $25 |
| FY2026 | $18 | $17 |
Transportation projects
An award does not confirm payment or project completion.
| Project | Recipient | Program | Amount |
|---|---|---|---|
| Hancock Street and New York Avenue Reconstruction Project | Trenton City | Municipal Aid | $1,465,446 |
| Prospect Street Cycle Track | Trenton City | Bikeways | $812,000 |
| North Harrison Street Traffic Calming | Princeton | Municipal Aid | $753,540 |
| Improvements to Various Sidewalks | Hightstown Borough | Municipal Aid | $576,237 |
| Pond Road Middle-School Route, Roadway Preservation and Safety Enhancements | Robbinsville Township | Municipal Aid | $531,910 |
| Road Improvements to Kuser Rd | Hamilton Township | Municipal Aid | $487,584 |