Bath, PA has a population of 2,691 and is the 9,381st largest city in the United States. The population density is 2,981 per sq mi which is 976% higher than the Pennsylvania average and 3191% higher than the national average. The median age in Bath is 35 which is approximately 14% lower than the Pennsylvania average of 41. In Bath, 52% of the population over 15 years of age are married, 97% speak English and 1% speak Spanish. 78% of Bath residents were born in Pennsylvania, 20% were born out of state, 0% were born outside of the United States and 2% were foreign born.