PA voter registration by county (Oct. 2025)
The books are closed for voter registration in the Keystone State in 2025. And while Republicans are celebrating their gains, and Democrats are licking their wounds, the bigger story for 2026 is the rise of the independent in Pennsylvania politics.
According to voter registration numbers provided by the Department of State, the gap between Democrats and Republicans continues to shrink.
Among the 8.9 million registered voters in Pennsylvania, 42.8 percent have indicated they are a member of the Democratic party, while 40.9% identify as Republican. That works out to a little more than 170,000 voters.
Independents continue to grow, as 12.7% checked the “no affiliation” box.
Since last October, Democrats have seen approximately 158,000 voters fall off their rolls, while the GOP has only lost about 30,000 – a difference of 128,000. Percentage-wise, that translates to a 3.97% loss by Dems and a 1.84% reduction in Republican registered voters.
Who’s growing? Yep, independents.
Those choosing “no affiliation” have grown by 134,000 or 3.11%. Among the top 10 counties with independent voters, Montgomery (+5.54%), Lancaster (+5.29%) and Berks (+5.27%) have seen the largest gains, with Philadelphia, Bucks, Chester and York also rising by 4.0+ percent.
Among the top 10 GOP counties, only two – Berks (+0.33%) and Westmoreland (+0.25%) saw increases over the past 12 months with Delaware (-3.44%) shedding the most.
The numbers are bleaker for Dems with the top 10 counties all losing 2.5% or more of their registered voters with Allegheny, Lehigh, Berks and Northampton conceding more than four percent.
Largest Democratic Counties
| County | Oct 2024 | July 2025 | Oct 2025 | Change / Year |
| Philadelphia | 796,221 | 767,574 | 768,569 | -3.47% |
| Allegheny | 522,563 | 499,485 | 501,247 | -4.08% |
| Montgomery | 310,207 | 300,726 | 302,253 | -2.56% |
| Delaware | 208,246 | 199,972 | 201,051 | -3.46% |
| Bucks | 199,932 | 192,350 | 192,609 | -3.66% |
| Chester | 162,840 | 157,235 | 158,551 | -2.63% |
| Lancaster | 114,199 | 110,591 | 111,027 | -2.76% |
| Lehigh | 114,929 | 109,643 | 109,872 | -4.40% |
| Berks | 108,704 | 103,744 | 103,820 | -4.49% |
| Northampton | 98,549 | 94,698 | 93,909 | -4.71% |
| Total | 3,971,607 | 3,806,544 | 3,813,866 | -3.97% |
Largest Republican Counties
| County | Oct 2024 | July 2025 | Oct 2025 | Change / Year |
| Allegheny | 270,952 | 264,188 | 264,863 | -2.25% |
| Montgomery | 212,792 | 208,604 | 209,005 | -1.78% |
| Bucks | 203,901 | 202,198 | 202,815 | -0.53% |
| Lancaster | 185,018 | 183,744 | 184,158 | -0.46% |
| York | 170,667 | 167,520 | 168,210 | -1.44% |
| Chester | 156,183 | 151,781 | 152,194 | -2.55% |
| Delaware | 149,923 | 145,024 | 144,760 | -3.44% |
| Philadelphia | 131,600 | 130,925 | 131,498 | -0.08% |
| Westmoreland | 130,712 | 130,719 | 131,039 | +0.25% |
| Berks | 117,619 | 117,419 | 118,002 | +0.33% |
| Total | 3,673,873 | 3,631,635 | 3,643,258 | -1.84% |
Largest “No Affiliation” Counties
(does not include 3rd parties)
| County | Oct 2024 | July 2025 | Oct 2025 | Change / Year |
| Philadelphia | 138,397 | 141,596 | 144,559 | +4.45% |
| Allegheny | 108,834 | 107,108 | 109,627 | +0.73% |
| Montgomery | 75,906 | 77,940 | 80,110 | +5.54% |
| Bucks | 64,179 | 65,565 | 67,093 | +4.54% |
| Chester | 54,078 | 55,100 | 56,672 | +4.80% |
| York | 48,910 | 49,281 | 51,060 | +4.40% |
| Lancaster | 46,093 | 47,135 | 48,532 | +5.29% |
| Delaware | 45,569 | 46,243 | 47,362 | +3.93% |
| Lehigh | 43,363 | 43,235 | 44,025 | +1.53% |
| Berks | 36,897 | 37,721 | 38,841 | +5.27% |
| Total | 1,096,427 | 1,103,810 | 1,130,562 | +3.11% |
Age Groups
| Range | Registered | Democrat | Republican | Other |
| 18-to-24 | 793,555 | 41.27% | 34.76% | 23.97% |
| 25-to-34 | 1,447,939 | 45.03% | 32.47% | 22.50% |
| 35-to-44 | 1,447,836 | 43.86% | 35.45% | 21.69% |
| 45-to-54 | 1,283,357 | 40.27% | 42.04% | 17.67% |
| 55-to-64 | 1,469,103 | 38.99% | 48.35% | 12.66% |
| 65-to-74 | 1,398,151 | 44.42% | 45.61% | 9.97% |
| 75 and over | 1,067,075 | 45.77% | 46.54% | 7.69% |
Steve Ulrich is managing editor of Politics PA where this article originally appeared.
