Hereford, PA has a population of 839 and is the 16,278th largest city in the United States. The population density is 848 per sq mi which is 206% higher than the Pennsylvania average and 835% higher than the national average. The median age in Hereford is 48 which is approximately 18% higher than the Pennsylvania average of 41. In Hereford, 60% of the population over 15 years of age are married, 81% speak English and 18% speak Spanish. 75% of Hereford residents were born in Pennsylvania, 13% were born out of state, 1% were born outside of the United States and 10% were foreign born.