Elmer, NJ has a population of 1,408 and is the 13,067th largest city in the United States. The population density is 1,575 per sq mi which is 157449% higher than the New Jersey average and 1639% higher than the national average. The median age in Elmer is 41 which is approximately 5% higher than the New Jersey average of 40. In Elmer, 59% of the population over 15 years of age are married, 98% speak English and 1% speak Spanish. 77% of Elmer residents were born in New Jersey, 22% were born out of state, 0% were born outside of the United States and 1% were foreign born.