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United States · Election results history · 2018 Senate · Pennsylvania
Election 2018 Results

Each election opens in its own mode: the forecast before the votes are counted, the live count while races are still too close to call, and the results once every race is decided.

2018 US Senate election in Pennsylvania

Robert P Casey Jr (Democrat) beat Louis J. Barletta (Republican) in Pennsylvania in 2018, 55.6% to 42.7%, a margin of 12.9 points and 642,832 votes.

The Democratic hold continued from 2012, when Robert P. Casey, Jr. also won.

Republicans led in 52 of the 67 counties and Democrats in 15. The largest, Philadelphia, cast 554,507 votes and went to the Democrat by 74.8 points. The closest was Cameron, where 427 votes separated the two parties.

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Early projection, based on early and incomplete polling: the likely matchups, each weighted by the betting markets' odds of both nominations, not a result. Each county is its 2024 presidential margin moved by its state's projected swing; set a national vote and every state, district and county moves by the same amount from our projection. Colours run in 100 steps from a safe Republican to a safe Democratic margin. Boundaries: US Census Bureau.

Senate

CandidatePartyVotesShare
Robert P Casey Jr won Democratic 2,777,680 55.6%
Louis J. Barletta Republican 2,134,848 42.7%
All other candidates 82,115 1.6%
Total4,994,643

Every county

CountyDemocratRepublicanOthersTotalMargin
Philadelphia 481,467 86.8% 66,653 12.0% 6,387 554,507 D+74.8
Allegheny 355,907 65.7% 176,351 32.6% 9,445 541,703 D+33.1
Montgomery 248,454 65.2% 126,666 33.3% 5,745 380,865 D+32.0
Bucks 165,408 56.2% 124,133 42.2% 4,776 294,317 D+14.0
Delaware 163,216 65.0% 84,423 33.6% 3,363 251,002 D+31.4
Chester 140,138 59.2% 92,380 39.0% 4,200 236,718 D+20.2
Lancaster 90,521 44.7% 107,454 53.1% 4,389 202,364 R+8.4
York 69,272 41.0% 95,814 56.8% 3,726 168,812 R+15.7
Westmoreland 63,956 43.9% 79,379 54.5% 2,413 145,748 R+10.6
Berks 73,714 51.0% 68,159 47.2% 2,660 144,533 D+3.8
Lehigh 73,632 57.3% 52,576 40.9% 2,230 128,438 D+16.4
Northampton 62,275 54.3% 50,385 44.0% 1,956 114,616 D+10.4
Dauphin 59,533 54.8% 47,152 43.4% 2,023 108,708 D+11.4
Luzerne 49,200 45.4% 58,040 53.6% 1,056 108,296 R+8.2
Cumberland 47,738 45.7% 54,525 52.2% 2,137 104,400 R+6.5
Erie 58,906 58.4% 40,348 40.0% 1,635 100,889 D+18.4
Lackawanna 51,444 61.1% 31,922 37.9% 890 84,256 D+23.2
Washington 39,220 47.5% 41,958 50.9% 1,318 82,496 R+3.3
Butler 31,010 39.0% 46,875 59.0% 1,610 79,495 R+20.0
Beaver 34,442 50.9% 31,916 47.2% 1,284 67,642 D+3.7
Centre 34,778 57.3% 24,332 40.1% 1,554 60,664 D+17.2
Monroe 30,626 55.3% 23,968 43.3% 818 55,412 D+12.0
Franklin 17,385 31.6% 36,735 66.8% 907 55,027 R+35.2
Cambria 21,590 43.5% 27,367 55.2% 650 49,607 R+11.6
Lebanon 18,368 37.4% 29,836 60.7% 945 49,149 R+23.3
Schuylkill 17,691 36.2% 30,452 62.3% 699 48,842 R+26.1
Blair 14,599 33.8% 27,826 64.5% 740 43,165 R+30.6
Mercer 18,136 44.1% 22,290 54.2% 671 41,097 R+10.1
Lycoming 13,893 33.8% 26,488 64.5% 699 41,080 R+30.7
Fayette 19,563 48.1% 20,514 50.4% 628 40,705 R+2.3
Adams 14,880 38.1% 23,419 59.9% 803 39,102 R+21.8
Lawrence 14,324 44.6% 17,375 54.0% 448 32,147 R+9.5
Crawford 11,720 39.0% 17,813 59.3% 502 30,035 R+20.3
Indiana 12,702 43.0% 16,314 55.2% 527 29,543 R+12.2
Northumberland 10,524 36.4% 17,926 62.1% 425 28,875 R+25.6
Somerset 9,322 32.6% 18,896 66.0% 419 28,637 R+33.4
Clearfield 9,540 35.6% 16,852 62.9% 411 26,803 R+27.3
Armstrong 8,570 35.0% 15,449 63.1% 469 24,488 R+28.1
Columbia 8,837 39.0% 13,437 59.4% 364 22,638 R+20.3
Carbon 8,739 38.7% 13,519 59.9% 316 22,574 R+21.2
Pike 8,696 41.8% 11,772 56.6% 326 20,794 R+14.8
Bradford 6,926 34.1% 13,032 64.1% 370 20,328 R+30.0
Wayne 7,625 37.8% 12,269 60.9% 268 20,162 R+23.0
Bedford 4,567 24.3% 14,044 74.6% 212 18,823 R+50.3
Venango 6,945 37.5% 11,210 60.6% 357 18,512 R+23.0
Perry 5,186 30.2% 11,607 67.6% 385 17,178 R+37.4
Susquehanna 5,521 34.7% 10,112 63.5% 283 15,916 R+28.8
Huntingdon 5,126 32.2% 10,491 65.9% 294 15,911 R+33.7
Jefferson 4,437 28.5% 10,872 69.8% 267 15,576 R+41.3
Tioga 4,145 28.2% 10,242 69.7% 317 14,704 R+41.5
Union 5,901 40.9% 8,317 57.6% 223 14,441 R+16.7
Warren 5,390 37.5% 8,734 60.8% 245 14,369 R+23.3
Clarion 4,924 35.1% 8,838 63.0% 269 14,031 R+27.9
Mifflin 3,934 28.6% 9,564 69.5% 254 13,752 R+40.9
Snyder 4,322 32.3% 8,826 65.9% 245 13,393 R+33.6
McKean 3,972 31.9% 8,285 66.5% 197 12,454 R+34.6
Greene 5,819 46.8% 6,422 51.7% 187 12,428 R+4.9
Clinton 5,289 42.7% 6,869 55.5% 220 12,378 R+12.8
Elk 4,498 39.9% 6,610 58.6% 174 11,282 R+18.7
Wyoming 3,868 36.4% 6,582 61.9% 178 10,628 R+25.5
Juniata 2,412 28.5% 5,853 69.1% 203 8,468 R+40.6
Montour 2,966 42.2% 3,943 56.1% 125 7,034 R+13.9
Potter 1,537 24.8% 4,564 73.6% 101 6,202 R+48.8
Fulton 1,061 20.0% 4,173 78.7% 70 5,304 R+58.7
Sullivan 962 35.2% 1,720 63.0% 48 2,730 R+27.8
Forest 693 35.9% 1,201 62.2% 38 1,932 R+26.3
Cameron 653 37.0% 1,080 61.2% 32 1,765 R+24.2

Margin: the Democrat's share of all votes minus the Republican's. Sources and how the results were checked.

Pennsylvania Senate elections we hold

YearWinnerMargin
2024 Dave McCormick (R) R+0.2
2022 John K Fetterman (D) D+4.9
2018 Robert P Casey Jr (D) D+12.9
2016 Patrick J. Toomey (R) R+1.4
2012 Robert P. Casey, Jr. (D) D+9.1
2010 Pat Toomey (R) R+2.0
2006 Bob Casey, Jr. (D) D+17.4
2004 Arlen Specter (R) R+10.6
2000 Rick Santorum (R) R+6.9
1998 Arlen Specter (R) R+26.6
1994 Rick Santorum (R) R+2.5
1992 Arlen Specter (R) R+2.8
1988 John Heinz (R) R+34.0
1986 Arlen Specter (R) R+13.6
1982 John Heinz (R) R+20.1
1980 Arlen Specter (R) R+2.4
1976 H. John Heinz III (R) R+5.6
1974 Richard Schweiker (R) R+7.1
1970 Hugh Scott (R) R+6.0
1968 Richard Schweiker (R) R+6.1
1964 Hugh Scott (R) R+1.5
1962 Joseph S. Clark (D) D+2.4
1958 Hugh Scott (R) R+2.8
1956 Joseph S. Clark (D) D+0.4
1952 Edward Martin (R) R+3.6
1950 James H. Duff (R) R+3.6
1946 Edward Martin (R) R+19.4
1944 Francis Myers (D) D+0.6
1940 Joseph F. Guffey (D) D+4.4
1938 James J. Davis (R) R+10.6
1934 Joseph F. Guffey (D) D+4.3
1932 James J. Davis (R) R+6.2
1928 David A. Reed (R) R+30.4
1926 William S. Vare (R) R+11.5
1922 David A. Reed (R) R+25.5
1920 Boies Penrose (R) R+32.8
1916 Philander Knox (R) R+19.1
1914 Boies Penrose (R) R+22.8