Silver Lake, NJ has a population of 4,007 and is the 7,447th largest city in the United States. The population density is 12,285 per sq mi which is 1228440% higher than the New Jersey average and 13460% higher than the national average. The median age in Silver Lake is 38 which is approximately 4% lower than the New Jersey average of 40. In Silver Lake, 44% of the population over 15 years of age are married, 44% speak English and 40% speak Spanish. 51% of Silver Lake residents were born in New Jersey, 8% were born out of state, 6% were born outside of the United States and 35% were foreign born.