Pennsylvania Population Rank 2025. Usafacts uses census data to break down the population of pennsylvania by race, age, and more. Montgomery county (820,656), bucks county (626,751), and delaware county (563,995) are all in the top five most populous counties in the state, and census statistics show that each of.
The ages, races, and population density of pennsylvania tell a story. The tables below provide updated data and demographic estimates for pennsylvania as of july 1, 2025.