Partisan identification in the electorate On August 10, 2026, the Pennsylvania Department of State reported that there were 3,842,840 (42.8%) registered Democrats, 3,635,181 (40.5%) registered Republicans, 1,183,935 (13.1%) registered unaffiliated and 314,412 (3.5%) registered with other parties.

Partisan affiliation of elected officials The following table indicates the party of elected officials in the U.S. state of Pennsylvania: Governor Lieutenant governor Attorney general State auditor general State treasurer

The table also indicates the historical party composition in the: State senate State house of representatives State delegation to the United States Senate State delegation to the United States House of Representatives

Following the 2020 Census, Pennsylvania lost one seat in the U.S. House of Representatives. As a result, starting with the general election of 2022, Pennsylvania sent 17 members to the house, and beginning with the general election of 2024 has 19 electoral votes.

1777–1790

YearExecutive officesState LegislatureUnited States CongressElectoral votesPresidentVice PresidentExecutive CouncilSenator (Class I)Senator (Class III)House1777Thomas Wharton Jr. George Bryan 51, 15, 6?began in 17891778George Bryan 54, 7?, 51779Joseph Reed Matthew Smith43, 26, 3?1780William Moore 51, 14, 7?178141, 311782William Moore James Potter 38, 361783John Dickinson James Ewing 39, 34, 1?178444, 291785James Irvine 56, 181786Benjamin Franklin Charles Biddle38, 37178741, 281788Peter Muhlenberg37, 321789Thomas Mifflin George Ross47, 22William Maclay Robert Morris 6PA, 2AAGeorge Washington /John Adams 179042, 27

1791–1872

YearExecutive officesState LegislatureUnited States CongressElectoral votesGovernorAuditor GeneralSenateHouseSenator (Class I)Senator (Class III)House1791Thomas Mifflin not an elected office10F, 8DR36F, 33DRvacantRobert Morris 4PA, 4AA179242F, 27DRGeorge Washington /John Adams 17939F, 9DR8AA, 5PA179410F, 8DR48F, 21DRAlbert Gallatin James Ross 179514F, 10DR49F, 29DRJames Ross William Bingham 8DR, 5F179615F, 9DR45F, 33DR7DR, 6FThomas Jefferson / John Adams 179744F, 34DR8DR, 5F179841F, 37DR179947F, 31DR9DR, 4F1800Thomas McKean 16F, 8DR41DR, 37FThomas Jefferson / John Adams 180113F, 11DR55DR, 23FPeter Muhlenberg 10DR, 3FGeorge Logan 180217DR, 8F71DR, 15F180321DR, 4F77DR, 9FSamuel Maclay 18DR180424DR, 1F81DR, 5FThomas Jefferson/George Clinton 180525DR78DR, 8F17DR, 1F1806Thomas McKean 15Const, 10DR53Const, 33DR180713Const, 12DR46DR, 40ConstAndrew Gregg 15DR, 3F180814DR, 7Quid, 4F43DR, 23F, 20QuidJames Madison/George Clinton 1809Simon Snyder 19DR, 7Quid, 5F74DR, 21FMichael Leib 16DR, 2F181022DR, 6F, 3Quid73DR, 15F, 7Quid181121DR, 7F, 3Quid72DR, 17F, 6Quid17DR, 1F181226DR, 5F84DR, 11FJames Madison/Elbridge Gerry 181377DR, 18FAbner Lacock 22DR, 1F181425DR, 6F85DR, 10FJonathan Roberts 21DR, 2F181521DR, 10F71DR, 24F19DR, 4F181619DR, 12F71DR, 26FJames Monroe/Daniel D. Tompkins 181757DR, 30F, 10Quid1818William Findlay 55DR, 42F181920DR, 11F64DR, 33FWalter Lowrie 182023DR, 6F, 2Quid67DR, 24F, 6Quid18DR, 5F1821Joseph Hiester 20DR, 11F52F, 45DRvacant15DR, 8F182217DR, 14F67DR, 30FWilliam Findlay 16DR, 7F182323DR, 10F71DR, 29F20DR, 6F1824John Andrew Shulze 21DR, 11F, 1?77DR, 23FAndrew Jackson/John C. Calhoun 182526DR, 7F79DR, 21FWilliam Findlay William Marks 14J, 11DR, 1F182627DR, 6F77DR, 23F17J, 9DR182774DR, 26FIsaac D. Barnard 22J, 3DR, 1NR182826J, 7NR76J, 22NR, 2 vac.Andrew Jackson/John C. Calhoun 182989J, 11NR24J, , 1NR1830George Wolf 26J, 6NR, 87J, 183125J, 5NR, 72J, William Wilkins 17J, , 2NR183223J, , 4NR74J, , 4NRGeorge M. Dallas Andrew Jackson/Martin Van Buren 183322J, , 2NR61J, , 5NR, 1?Samuel McKean 14J, , 4NR183424J, , 2NR64J, , 11NR183525J, , 2W62J, , 11WJames Buchanan 17J, , 4NR1836Joseph Ritner 23D, , 1W, 28DMartin Van Buren/Richard Mentor Johnson 183715D, 12W, 72D, , 7WSamuel McKean James Buchanan 16D, , 3W, 2J183819W, 14D56D, 44W1839David R. Porter 18W, 15Dvacant17D, 6W, 184017D, 16W69D, 31WDaniel Sturgeon William Henry Harrison/John Tyler 184120W, 13D55W, 45D15D, 13W184217W, 16D64D, 34W, 2184319D, 14W57D, 40W, 2, 1I12D, 12W184422D, 11W58D, 42W13W, 11DJames K. Polk/George M. Dallas 1845Francis R. Shunk 21D, 11W, 1KN51D, 41W, 8KNSimon Cameron 12D, 10W, 2KN184618W, 14D, 1KN67D, 33W184756W, 44D16W, 7D, 1KN184819W, 14D64D, 36W15W, 8D, 1KNZachary Taylor/Millard Fillmore William F. Johnston 184921W, 12D50D, 45W, 5KNJames Cooper 11W, 11D, 1KN, 1FS185017D, 16W59D, 41W1851Ephraim Banks 16W, 16D, 1I60D, 36W, 2ID, 1IW, 1 vac.Richard Brodhead 15D, 9W1852William Bigler 17W, 16D58D, 37W, 5KNFranklin Pierce/William R. King 185317W, 15D, 1KN62D, 38W16D, 9W185418D, 14W, 1KN70D, 26W, 4KN1855James Pollock 17D, 15W, 1KN46W, 32D, 22KNvacant13O, 7D, 3W, 1R, 1KN185617D, 16Fus66D, 34FusWilliam Bigler James Buchanan/John C. Breckinridge 1857Jacob Fry Jr. 18Fus, 15D53D, 47FusSimon Cameron 15D, 10R1858William F. Packer 21D, 12R68D, 30R, 2I14D, 11R185917D, 16R67R, 33D20R, 5D1860Thomas E. Cochran 21R, 12D66R, 34DAbraham Lincoln/Hannibal Hamlin 1861Andrew Gregg Curtin 27R, 6D71R, 29DDavid Wilmot Edgar Cowan 19R, 6D186223R, 10D51D, 49R17R, 8D1863Isaac Slenker 21R, 12D55D, 45RCharles R. Buckalew 12R, 12D186417R, 16D52R, 48DAbraham Lincoln/Andrew Johnson 186520R, 13D64R, 36D15R, 9D1866John F. Hartranft 21R, 12D67R, 33D16R, 8D1867John W. Geary 62R, 38DSimon Cameron 18R, 6D186819R, 14D54R, 46DUlysses S. Grant/Schuyler Colfax 186918R, 15D62R, 38DJohn Scott 16R, 8D187060R, 40D18R, 6D187117D, 16R55R, 45D13R, 11D187217R, 16D63R, 39D, 1IUlysses S. Grant/Henry Wilson C. D. Brigham

1873–1978

YearExecutive officesState LegislatureUnited States CongressElectoral votesGovernorLieutenantGovernorAuditorGeneralTreasurerSenateHouseSenator(Class I)Senator(Class III)House1873John F. Hartranft no such officeHarrison Allen Robert W. Mackey 18R, 14D, 1LR60R, 39D, 1IJohn Scott Simon Cameron 22R, 5D187420R, 12D, 1LR57R, 43D1875John Latta Justus F. Temple 30R, 20D110D, 89R, 1I, 1ProhWilliam A. Wallace 17D, 10R1876Henry Rawle 29R, 21D18D, 9RRutherford B. Hayes/William A. Wheeler 187731R, 19D119R, 81D, 1IDJ. Donald Cameron 17R, 10D1878William P. Schell Amos C. Noyes 1879Henry M. Hoyt Charles W. Stone 32R, 17D, 1GB107R, 77D, 17GB17R, 8D, 2GB1880Samuel Butler James A. Garfield/Chester A. Arthur 1881John A. Lemon 121R, 78D, 1GB, John I. Mitchell 18R, 7D, 2GB1882Silas M. Bailey 1883Robert E. Pattison Chauncey Forward Black 30R, 20D113D, 88R15R, 12D, 1GB1884Jerome B. Niles William Livsey James G. Blaine/John A. Logan 188531R, 19D140R, 60D, 1GBR20R, 8D1886Matthew Quay 1887James A. Beaver William T. Davies A. Wilson NorrisWilliam Livsey 34R, 16D131R, 69D, 1GBLMatthew Quay 1888William B. Hart Benjamin Harrison/Levi P. Morton Thomas McCamant 1889William Livsey 144R, 60D21R, 7D1890Henry K. Boyer 1891Robert E. Pattison Louis Arthur Watres 31R, 19D122R, 79D, 3Fus18R, 10D1892David McMurtrie Gregg John Wallace Morrison 17R, 11DBenjamin Harrison/Whitelaw Reid 189333R, 17D135R, 69D20R, 10D1894Samuel Jackson 1895Daniel H. Hastings Walter Lyon Amos H. Mylin44R, 6D175R, 29D28R, 2D1896Benjamin J. Haywood William McKinley/Garret Hobart 1897172R, 32DBoies Penrose 27R, 3D1898Levi G. McCauley James S. Beacom 1899William A. Stone John P. S. Gobin 37R, 13D127R, 71D, 6Fusvacant20R, 10D1900James E. Barnett William McKinley/Theodore Roosevelt 1901Edmund B. Hardenbergh 38R, 12D156R, 48DMatthew Quay 26R, 4D1902Frank G. Harris 1903Samuel W. Pennypacker William M. Brown 40R, 10D160R, 44D28R, 4D1904William Preston Snyder William L. Mathues 29R, 3DTheodore Roosevelt/Charles W. Fairbanks Philander C. Knox 1905187R, 17D31R, 1D1906William H. Berry 1907Edwin Sydney Stuart Robert S. Murphy Robert K. Young 157R, 50D25R, 7D1908John O. Sheatz William Howard Taft/James S. Sherman 190939R, 11D173R, 34DGeorge T. Oliver 27R, 5D1910A. E. Sisson 1911John K. Tener John Merriman Reynolds Charles Frederick Wright 38R, 18D162R, 44D, 1Soc23R, 9D191224R, 8DTheodore Roosevelt/Hiram Johnson 1913Archibald W. Powell Robert K. Young 34R, 13D, 3Prog127R, 57D, 14Prog, 9Wash22R, 12D, 2Prog19141915Martin Grove Brumbaugh Frank B. McClain 38R, 11D, 1Prog164R, 41D, 1Soc, 1Prog30R, 6D1916Charles Evans Hughes/Charles W. Fairbanks 1917Charles A. Snyder Harmon M. Kephart 39R, 10D, 1Prog169R, 37D, 1Soc, 1ProgPhilander C. Knox 29R, 6D, 1Prog191828R, 7D, 1Prog1919William Cameron Sproul Edward E. Beidleman 44R, 6D184R, 23D29R, 7D192030R, 6DWarren G. Harding/Calvin Coolidge 1921Samuel S. Lewis Charles A. Snyder 47R, 3D193R, 14D35R, 1DWilliam E. Crow 1922George W. Pepper David A. Reed 1923Gifford Pinchot David J. Davis 43R, 7D167R, 41D30R, 6D1924Calvin Coolidge/Charles G. Dawes 1925Edward Martin Samuel S. Lewis 42R, 8D194R, 14D36R19261927John Stuchell Fisher Arthur James 45R, 5D191R, 17DWilliam Scott Vare 34R, 2D1928Herbert Hoover/Charles Curtis 1929Charles A. Waters Edward Martin 44R, 6D192R, 16D35R, 1D1930Joseph R. Grundy 36R1931Gifford Pinchot Edward C. Shannon 46R, 4D184R, 22D, 2SocJames J. Davis 33R, 3D1932Herbert Hoover/Charles Curtis 1933Frank E. Baldwin Charles A. Waters 43R, 7D140R, 65D, 2I, 1Soc23R, 11D193422R, 12D1935George Howard Earle III Thomas Kennedy 31R, 19D117D, 89R, 2SocJoseph F. Guffey 23D, 11R1936Franklin D. Roosevelt/John Nance Garner 1937Warren R. Roberts F. Clair Ross 34D, 16R154D, 54R27D, 7R19381939Arthur James Samuel S. Lewis 27R, 23D129R, 79D19R, 15D1940Franklin D. Roosevelt/Henry A. Wallace 1941F. Clair Ross G. Harold Wagner 32R, 18D126D, 82R19D, 15R19421943Edward Martin John C. Bell Jr. 132R, 76D20R, 13D194421R, 12DFranklin D. Roosevelt/Harry S. Truman 1945Ted A. RosenbergRamsey S. Black 109R, 99DFrancis J. Myers 18R, 15DG. Harold Wagner 194619R, 14D1947John C. Bell Jr. vacant34R, 16D170R, 38DEdward Martin 28R, 5DJames H. Duff Daniel Strickler 1948Thomas E. Dewey/Earl Warren 1949Weldon Brinton Heyburn Charles R. Barber 35R, 15D117R, 91D17R, 16D19501951John S. Fine Lloyd H. Wood 30R, 20D120R, 88DJames H. Duff 20R, 13D1952Dwight D. Eisenhower/Richard Nixon 1953Charles R. Barber Weldon Brinton Heyburn 32R, 18D110R, 98D19R, 11D19541955George M. Leader Roy E. Furman 26R, 24D112D, 98R16R, 14D19561957Charles C. Smith Robert F. Kent 27R, 23D126R, 84DJoseph S. Clark Jr. 17R, 13D19581959David L. Lawrence John Morgan Davis 28R, 22D108D, 102RHugh Scott 16D, 14R1960John F. Kennedy/Lyndon B. Johnson 1961Thomas Z. Minehart Grace M. Sloan 25D, 25R109D, 101R16R, 14D19621963William Scranton Raymond P. Shafer 27R, 23D108R, 102D14R, 13D1964Lyndon B. Johnson/Hubert Humphrey 1965Grace M. Sloan Thomas Z. Minehart 28R, 22D116D, 93R15D, 12R19661967Raymond P. Shafer Raymond J. Broderick 27R, 23D104R, 99D14D, 13R1968Hubert Humphrey/Edmund Muskie 1969Bob Casey Sr. Grace M. Sloan 107D, 96RRichard Schweiker 19701971Milton Shapp Ernest Kline 26D, 24R113D, 90R1972Richard Nixon/Spiro Agnew 1973107R, 96D13D, 12R1974197530D, 20R113D, 90R14D, 11R1976Jimmy Carter/Walter Mondale 1977Al Benedict Robert E. Casey 31D, 19R118D, 85RJohn Heinz 17D, 8R1978

1978–present