Princeton Junction, NJ has a population of 2,503 and is the 9,851st largest city in the United States. The population density is 1,373 per sq mi which is 137218% higher than the New Jersey average and 1416% higher than the national average. The median age in Princeton Junction is 42 which is approximately 6% higher than the New Jersey average of 40. In Princeton Junction, 83% of the population over 15 years of age are married, 73% speak English and 1% speak Spanish. 33% of Princeton Junction residents were born in New Jersey, 37% were born out of state, 1% were born outside of the United States and 29% were foreign born.