Montgomery, PA has a population of 1,454 and is the 12,878th largest city in the United States. The population density is 2,660 per sq mi which is 860% higher than the Pennsylvania average and 2836% higher than the national average. The median age in Montgomery is 34 which is approximately 17% lower than the Pennsylvania average of 41. In Montgomery, 61% of the population over 15 years of age are married, 98% speak English and 1% speak Spanish. 85% of Montgomery residents were born in Pennsylvania, 14% were born out of state, 0% were born outside of the United States and 1% were foreign born.