State Line, PA has a population of 2,619 and is the 9,561st largest city in the United States. The population density is 956 per sq mi which is 245% higher than the Pennsylvania average and 956% higher than the national average. The median age in State Line is 46 which is approximately 13% higher than the Pennsylvania average of 41. In State Line, 68% of the population over 15 years of age are married, 96% speak English and 4% speak Spanish. 41% of State Line residents were born in Pennsylvania, 55% were born out of state, 2% were born outside of the United States and 2% were foreign born.