In 2019, Mercer County, NJ had a population of 367k people with a median age of 38.8 and a median household income of $79,492. Between 2018 and 2019 the population of Mercer County, NJ declined from 369,811 to 367,430, a −0.644% decrease and its median household income declined from $80,632 to $79,492, a −1.41% decrease.
The 5 largest ethnic groups in Mercer County, NJ are White (Non-Hispanic) (48.2%), Black or African American (Non-Hispanic) (19.4%), Asian (Non-Hispanic) (11.8%), White (Hispanic) (11.5%), and Other (Hispanic) (5.28%). 0% of the households in Mercer County, NJ speak a non-English language at home as their primary language.
87.5% of the residents in Mercer County, NJ are U.S. citizens.
The largest universities in Mercer County, NJ are Thomas Edison State University (2,422 degrees awarded in 2020), Princeton University (2,188 degrees), and The College of New Jersey (2,063 degrees).
In 2019, the median property value in Mercer County, NJ was $291,600, and the homeownership rate was 62.6%. Most people in Mercer County, NJ drove alone to work, and the average commute time was 27.8 minutes. The average car ownership in Mercer County, NJ was 2 cars per household.
Mercer County, NJ borders Burlington County, NJ, Hunterdon County, NJ, Middlesex County, NJ, Monmouth County, NJ, Somerset County, NJ, and Bucks County, PA.