| Pennsylvania's 18th congressional district | |
|---|---|
| Obsolete district | |
| Created | 1820 |
| Eliminated | 2020 |
| Years active | 1823–2023 |

Pennsylvania's 18th congressional district was a district including the city ofPittsburgh and parts of surrounding suburbs. A variety of working class and majority black suburbs located to the east of the city were included, such asMcKeesport andWilkinsburg. Also a major part of the district was a number of middle class suburbs that have historic Democratic roots, such asPleasant Hills andPenn Hills. The district became obsolete following the2020 United States census. It was largely replaced byPennsylvania's 12th congressional district.
The district covered much of the area that was the center of theWhiskey Rebellion of the 1790s.
In February 2018, theSupreme Court of Pennsylvania ruled that the district map violated the state constitution due to gerrymandering and redrew all of the state's congressional districts. The 18th and14th districts swapped numbers and had their boundaries adjusted for the2018 elections (afterMarch's special election) and thereafter.[1][2]
Before the court-ordered redistricting in February 2018, the district was concentrated in the southern suburbs ofPittsburgh. It was predominantly white, although it contained a diverse range of suburbs. It was drawn in such a way that in some locations, neighborhoods and even streets were split between the 18th and the neighboring12th and14th districts. In parts of the eastern portion of the district, one side of the street was in the 12th while the other side was in the 18th. In the west, one side of the street was in the 14th while the other side was in the 18th.
Although there were 35,000 more[3]Democrats in the district than Republicans in 2018, the district had been trending increasingly Republican since the mid-1990s; most of the district's state legislators were Republicans. The district was home to many large coal mines and the energy industry was an important employer. The western part of the district contained some rural regions of Washington County, as well as the very wealthy suburbs in the northern part of that county, which tends to be more Republican than the part contained in the neighboring9th District. The district also contained many of Allegheny County's southern suburbs of Pittsburgh, which ranged from traditionally wealthy areas such asUpper St. Clair to middle-class communities such asBethel Park and working-class labor towns such asElizabeth.
The district skewed older and had the second-oldest electorate in the state in 2017.[4]
The district wound along the eastern suburbs at the edge of Allegheny County, including most of the large suburban commercial center ofMonroeville, and in western Westmoreland County. Central Westmoreland County, including the city ofGreensburg, was also part of the district. It also contained the rural foothills of the county at the district's eastern end. Westmoreland County has become a major Republican stronghold.
| Party enrollment as of October 18, 2021[5] | |||||
|---|---|---|---|---|---|
| Party | Total voters | Percentage | |||
| Democratic | 328,743 | 62.84% | |||
| Republican | 118,874 | 22.72% | |||
| Independent/other parties | 75,486 | 14.43% | |||
| Total | 523,103 | 100% | |||
The district became obsolete following the2020 United States census.[6] It was largely replaced byPennsylvania's 12th congressional district, while some suburbs ofPittsburgh, such asWilkinsburg, were redrawn into the17th district.[7]
| Year | Office | Results[8][9] |
|---|---|---|
| 2008 | President | Obama 63% - 36% |
| Attorney General | Morganelli 55% - 45% | |
| Auditor General | Wagner 78% - 22% | |
| 2010 | Senate | Sestak 61% - 39% |
| Governor | Onorato 56% - 44% | |
| 2012 | President | Obama 63% - 35% |
| Senate | Casey Jr. 67% - 33% | |
| 2014 | Governor | Wolf 65% - 35% |
| 2016 | President | Clinton 62% - 35% |
| Senate | McGinty 62% - 34% | |
| Attorney General | Shapiro 66% - 34% | |
| Treasurer | Torsella 65% - 29% | |
| Auditor General | DePasquale 68% - 27% | |
| 2018 | Senate | Casey Jr. 71% - 27% |
| Governor | Wolf 72% - 26% | |
| 2020 | President | Biden 65% - 34% |
| Attorney General | Shapiro 67% - 30% | |
| Treasurer | Torsella 63% - 33% | |
| Auditor General | Ahmad 62% - 34% |
| Party | Candidate | Votes | % | |
|---|---|---|---|---|
| Republican | Tim Murphy (incumbent) | 216,727 | 64.0 | |
| Democratic | Larry Maggi | 122,146 | 36.0 | |
| Total votes | 338,873 | 100.0 | ||
| Republicanhold | ||||
| Party | Candidate | Votes | % | |
|---|---|---|---|---|
| Republican | Tim Murphy (incumbent) | 166,076 | 100.0 | |
| Total votes | 166,076 | 100.0 | ||
| Republicanhold | ||||
| Party | Candidate | Votes | % | |
|---|---|---|---|---|
| Republican | Tim Murphy (incumbent) | 293,684 | 100.0 | |
| Total votes | 293,684 | 100.0 | ||
| Republicanhold | ||||
| Party | Candidate | Votes | % | ±% | |
|---|---|---|---|---|---|
| Democratic | Conor Lamb | 114,102 | 49.86% | +49.86% | |
| Republican | Rick Saccone | 113,347 | 49.53% | −50.47% | |
| Libertarian | Drew Gray Miller | 1,381 | 0.60% | +0.60% | |
| Total votes | 228,830 | 100.00% | |||
| Plurality | 755 | 0.33% | -99.67% | ||
| Democraticgain fromRepublican | |||||
| Party | Candidate | Votes | % | |
|---|---|---|---|---|
| Democratic | Mike Doyle (incumbent) | 231,472 | 100.0 | |
| Total votes | 231,472 | 100.0 | ||
| Democratichold | ||||
| Party | Candidate | Votes | % | |
|---|---|---|---|---|
| Democratic | Mike Doyle (incumbent) | 266,084 | 69.3 | |
| Republican | Luke Negron | 118,163 | 30.7 | |
| Total votes | 384,247 | 100.0 | ||
| Democratichold | ||||
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