Montgomery and Chester counties picked up about 2,500 and 2,600 residents, respectively, between July 2024 and July 2025, according to new estimates from the U.S. Census Bureau. Meanwhile, Bucks County lost around 600 people, and Delaware County lost around 500. Growth in Montgomery and Chester could relate to those counties having more available land and more new housing units, while Bucks and Delaware counties haven’t built up as rapidly. Philadelphia’s population appears to still be rebounding — but at a slowing rate — from significant losses during the pandemic years. The gain of 1,546 new residents between July 2024 and July 2025 was much more modest than the prior year’s estimated gain of 6,913 residents.
Source: Philadelphia Inquirer; 3/26/2026