Little Britain, PA has a population of 437 and is the 20,379th largest city in the United States. The population density is 302 per sq mi which is 9% higher than the Pennsylvania average and 233% higher than the national average. The median age in Little Britain is 26 which is approximately 35% lower than the Pennsylvania average of 41. In Little Britain, 57% of the population over 15 years of age are married, 86% speak English and 0% speak Spanish. 85% of Little Britain residents were born in Pennsylvania, 15% were born out of state, 0% were born outside of the United States and 0% were foreign born.