West Middlesex, PA has a population of 843 and is the 16,247th largest city in the United States. The population density is 997 per sq mi which is 260% higher than the Pennsylvania average and 1001% higher than the national average. The median age in West Middlesex is 43 which is approximately 5% higher than the Pennsylvania average of 41. In West Middlesex, 54% of the population over 15 years of age are married, 97% speak English and 1% speak Spanish. 82% of West Middlesex residents were born in Pennsylvania, 16% were born out of state, 1% were born outside of the United States and 1% were foreign born.