The state will drop from 18 to 17 seats for the 2022 elections. Since peaking at 36 in 1910, Pennsylvania has lost U.S. House seats following every census Pennsylvania has maintained a relatively steady population of about 12.7 million over the last 10 years, but it has been outpaced by growing states such as Florida, Colorado, Montana, North Carolina, Montana and Oregon, which will gain one seat, and Texas, which will gain two seats. “This is not a surprise,” said Kris Kanthak, a University of Pittsburgh political science professor. “We’re older. We’re not getting quite as many people coming in.” Besides Pennsylvania, states losing a House seat under reapportionment, the term used to describe the reallocation of seats based on census results, include California, New York, West Virginia, Ohio, Illinois and Michigan.