In 2018, Mercer County, NJ had a population of 370k people with a median age of 38.9 and a median household income of $80,632. Between 2017 and 2018 the population of Mercer County, NJ declined from 374,733 to 369,811, a -1.31% decrease and its median household income grew from $79,173 to $80,632, a 1.84% increase.
The 5 largest ethnic groups in Mercer County, NJ are White (Non-Hispanic) (48.8%), Black or African American (Non-Hispanic) (20%), White (Hispanic) (12.6%), Asian (Non-Hispanic) (11.3%), and Other (Hispanic) (4.4%). 0% of the households in Mercer County, NJ speak a non-English language at home as their primary language, and 88.1% of the residents in Mercer County, NJ are U.S. citizens.
In 2018, the median property value in Mercer County, NJ was $289,700, and the homeownership rate was 62.6%. Most people in Mercer County, NJ drove alone to work, and the average commute time was 25.3 minutes. The average car ownership in Mercer County, NJ was 2 cars per household.