New Jersey 2020 Census Population Density By County Map

The population density of New Jersey from the 2020 Census was 1,262.99 people per square mile, based on data from the US Census Bureau.

Hudson County had the highest population density (15,691.66 people per square mile), followed by Essex County (6,850.39 people per square mile), and then Union County (5,598.58 people per square mile). On the other hand, the 3 counties with the lowest population density were: Salem County (195.37 people per square mile), Sussex County (278.06 people per square mile), and Hunterdon County (301.4 people per square mile).

You can also see this information for other states and also for the US by state.

Hover over or click on the counties to see the population density for each county. The data can also be found in a table below. You can use the table to sort, filter, and explore the data further.