Counties · Allegheny
Allegheny County
Allegheny has 924,460 registered voters as of Oct 19, 2026, 10.2% of the state's roll. Democrats lead by 244,729, down from 252,111 at the November 2024 election. The scenario model treats Allegheny as its own region.
Registered now
924,460
All parties, Oct 19, 2026
Democratic lead
244,729
D 54.9% · R 28.5% of the roll
Since Nov 2024
−28,083
−2.9% from 952,543
Inactive
10.3%
828,927 active, 95,533 inactive
Registration by party
Since Nov 2024 the Republican share here fell from 28.8% to 28.5% and the Democratic share fell from 55.2% to 54.9%.
Now (Oct 19, 2026)
- Democrats 54.9%
- Republicans 28.5%
- Other and no party 16.6%
May 2026 primary
- Democrats 54.9%
- Republicans 28.8%
- Other and no party 16.3%
Nov 2024 election
- Democrats 55.2%
- Republicans 28.8%
- Other and no party 16.0%
| When | Dem | Rep | Other | Total |
|---|---|---|---|---|
| Now (Oct 19, 2026) | 507,863 | 263,134 | 153,463 | 924,460 |
| May 2026 primary | 502,464 | 263,931 | 149,141 | 915,536 |
| Nov 2024 election | 526,268 | 274,157 | 152,118 | 952,543 |
Democrats lead by 244,729, up from 238,533 at the May primary.
Turnout, 2014–2024
In 2022, 61.0% of Allegheny's registered voters cast a governor vote, 0.5 points above the state. In 2024 it was 75.6%, 1.0 points below the state.
- Allegheny
- Statewide
Results by year
Shapiro carried Allegheny by 39.0 points in 2022, and Harris by 20.3 in 2024. Democrats carried it in all 6 elections.
| Election | Democrat | Votes | Republican | Votes | Other | Margin | Registered | Turnout |
|---|---|---|---|---|---|---|---|---|
| 2014 governor | Wolf | 207,017 (58%) | Corbett | 148,057 (42%) | 0 | Wolf +16.6 | 881,574 | 40.3% |
| 2016 president | Clinton | 366,934 (57%) | Trump | 259,125 (40%) | 22,949 | Clinton +16.6 | 924,921 | 70.2% |
| 2018 governor | Wolf | 364,710 (67%) | Wagner | 168,893 (31%) | 7,702 | Wolf +36.2 | 941,028 | 57.5% |
| 2020 president | Biden | 430,212 (60%) | Trump | 283,089 (39%) | 8,345 | Biden +20.4 | 942,256 | 76.6% |
| 2022 governor | Shapiro | 393,386 (69%) | Mastriano | 169,913 (30%) | 9,514 | Shapiro +39.0 | 939,488 | 61.0% |
| 2024 president | Harris | 429,916 (60%) | Trump | 283,595 (39%) | 6,993 | Harris +20.3 | 952,543 | 75.6% |
What Garrity needs here
On the smallest uniform path to a statewide tie, Garrity needs 37.9% of the ballot in Allegheny. That is 8.2 points more than Mastriano won in 2022, and 1.5 points below Trump's 2024 share.
Mastriano 2022
29.7%
Wagner 2018 31.2% · Corbett 2014 41.7%
Trump 2024
39.4%
Share of the presidential ballot
Tie-path target
37.9%
38.5% of the two-party vote
Gain over Mastriano
+8.2 pts
Share of the ballot
Net votes needed
+92,451
Over a 2022 replay, 11.5% of the statewide gap
In 2022 Shapiro won Allegheny by 223,473 votes. At the target, on about 563,650 ballots at 2022 turnout on today's roll, Garrity would still lose the county by 127,447 votes. That is 92,451 net votes better for her than a 2022 replay on the same roll.
How turnout is measured
Turnout is votes in the top race divided by registered voters. The top race is governor in 2014, 2018 and 2022 and president in 2016, 2020 and 2024. The state's returns files have no total-ballots count, so this undercounts by the roughly 1% who skip the top race.
The state's own 2024 count of people who voted in Allegheny is 722,247, against 720,504 presidential votes.
A turnout rate can rise because the roll shrank, not because more people voted. That did not happen to a large degree here: no four-year span saw the roll fall 5% or more while votes held within 3%. Warren is the clearest case statewide: 20,650 presidential votes in 2020 and 20,723 in 2024 on a roll that fell from 31,431 to 26,871.