Princeton is a city located in Mercer County New Jersey. With a 2020 population of 31,021, it is the 26th largest city in New Jersey and the 1254th largest city in the United States . Princeton is currently declining at a rate of -0.27% annually but its population has increased by 152.06% since the most recent census, which recorded a population of 12,307 in 2010. Princeton reached it's highest population of in . Spanning over 18 miles, Princeton has a population density of 1,729 people per square mile.
The average household income in Princeton is $234,375 with a poverty rate of 7.85%. The median rental costs in recent years comes to $1,532 per month, and the median house value is $866,200. The median age in Princeton is 33.8 years, 30.7 years for males, and 39.4 years for females.