Spring Lake, NJ has a population of 2,973 and is the 8,866th largest city in the United States. The population density is 2,231 per sq mi which is 223016% higher than the New Jersey average and 2363% higher than the national average. The median age in Spring Lake is 55 which is approximately 39% higher than the New Jersey average of 40. In Spring Lake, 64% of the population over 15 years of age are married, 97% speak English and 1% speak Spanish. 63% of Spring Lake residents were born in New Jersey, 33% were born out of state, 1% were born outside of the United States and 3% were foreign born.