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County · New Jersey
Mercer County
392,138Population
1.2 %Change since 2020
3,051Net migration
5.3 %Unemployment rate
Facts
- Population
- 392,138 (2024)
- Change since 2020
- 1.2 %
- Net migration
- 3,051 (2023)
- Unemployment rate
- 5.3 % (2025)
- State
- New Jersey
- Population base, April 2020
- 387,333 (2020)
- Births
- 4,165 (2023)
- Births per 1,000 residents, 2023
- 10.6
- Deaths
- 3,133 (2023)
- Deaths per 1,000 residents, 2023
- 8.0
- Natural change, 2023
- 1,032
- International migration
- 6,076 (2023)
- Domestic migration
- -3,025 (2023)
- Net migration per 1,000, 2023
- 7.8
- Postal code
- NJ
- FIPS code
- 34021
Sources: US Census Bureau — Population Estimates, Bureau of Labor Statistics — LAUS
Unemployment rate, annual average
| Period | Value |
|---|---|
| 2025 | 5.3 % |
| 2024 | 4.6 % |
| 2023 | 4.2 % |
| 2022 | 3.7 % |
| 2021 | 6.1 % |
| 2020 | 8.0 % |
| 2019 | 3.4 % |
| 2018 | 3.8 % |
| 2017 | 4.4 % |
| 2016 | 4.7 % |
| 2015 | 4.9 % |
| 2014 | 5.8 % |
Population estimates, 2020–2024
| Period | Value |
|---|---|
| 2024 | 392,138 |
| 2023 | 386,296 |
| 2022 | 382,165 |
| 2021 | 382,231 |
| 2020 | 386,492 |