Millville, NJ has a population of 28,399 and is the 1,506th largest city in the United States. The population density is 676 per sq mi which is 67518% higher than the New Jersey average and 646% higher than the national average. The median age in Millville is 39 which is approximately 3% lower than the New Jersey average of 40. In Millville, 50% of the population over 15 years of age are married, 88% speak English and 10% speak Spanish. 73% of Millville residents were born in New Jersey, 19% were born out of state, 5% were born outside of the United States and 3% were foreign born.