New Jersey Population By County in 2021 (ACS-5Yrs)
Updated on February 28, 2025.
Based on the US Census ACS-5Yrs estimates, in 2021, the total population of New Jersey was 9.23M. Among all New Jersey counties, Bergen was the most populated county (952.98K), followed by Middlesex (858.77K), and then Essex (852.72K).
On the other hand, the least populated counties were: Salem (64.75K), Cape May (95.49K), and Warren (109.35K).
The chart and table below shows the population of each county and the percentage of New Jersey population in each county.
You can see similar information for other states and by state for the United States.
Related Topics: New Jersey ACS-5Yrs Estimates, 2021 Topic List.
Data Source: US Census - ACS 5-Year Estimates, 2021 Census.
New Jersey Population By County in 2021
New Jersey Population By County in 2021
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| County | Population | % of State Population |
|---|---|---|
| Atlantic | 273865 | 2.97 |
| Bergen | 952979 | 10.32 |
| Burlington | 460102 | 4.98 |
| Camden | 521194 | 5.64 |
| Cape May | 95488 | 1.03 |
| Cumberland | 154921 | 1.68 |
| Essex | 852720 | 9.24 |
| Gloucester | 300821 | 3.26 |
| Hudson | 713264 | 7.72 |
| Hunterdon | 128807 | 1.40 |
| Mercer | 384951 | 4.17 |
| Middlesex | 858770 | 9.30 |
| Monmouth | 642160 | 6.95 |
| Morris | 508347 | 5.51 |
| Ocean | 630057 | 6.82 |
| Passaic | 521067 | 5.64 |
| Salem | 64752 | 0.70 |
| Somerset | 343950 | 3.73 |
| Sussex | 144492 | 1.57 |
| Union | 571963 | 6.19 |
| Warren | 109354 | 1.18 |