New Market, PA has a population of 628 and is the 18,147th largest city in the United States. The population density is 3,411 per sq mi which is 1131% higher than the Pennsylvania average and 3665% higher than the national average. The median age in New Market is 40 which is approximately 1% lower than the Pennsylvania average of 41. In New Market, 53% of the population over 15 years of age are married, 86% speak English and 4% speak Spanish. 88% of New Market residents were born in Pennsylvania, 4% were born out of state, 0% were born outside of the United States and 8% were foreign born.