Monmouth Beach, NJ has a population of 3,249 and is the 8,406th largest city in the United States. The population density is 3,176 per sq mi which is 317546% higher than the New Jersey average and 3406% higher than the national average. The median age in Monmouth Beach is 53 which is approximately 33% higher than the New Jersey average of 40. In Monmouth Beach, 70% of the population over 15 years of age are married, 92% speak English and 2% speak Spanish. 55% of Monmouth Beach residents were born in New Jersey, 37% were born out of state, 1% were born outside of the United States and 7% were foreign born.