Democrats regained the governorship of Kentucky and held the office in Louisiana, despite strong campaign efforts by President Donald Trump for the Republican candidates.

[15] Georgia Republican Sen. Johnny Isakson announced in August 2019 that he would resign on December 31, 2019, due to deteriorating health.

Also during 2019, changes in partisan balance in the House of Representatives happened as the result of members of Congress switching their party affiliation.

[17] Following a week of speculation, on December 19, the day after voting against the impeachment of Donald Trump, Rep. Jeff Van Drew of New Jersey officially left the Democratic Party to become a Republican.

[31] Democrats gained majorities of both houses of the Virginia General Assembly, giving them control of the legislature for the first time in 20 years.

[47] Incumbent mayors won re-election in major cities during 2019, including Arlington, Texas (Jeff Williams[48]); Cary, North Carolina (Harold Weinbrecht[49]); Charlotte, North Carolina (Vi Lyles[50]); Charleston, South Carolina (John Tecklenburg[51]); Colorado Springs, Colorado (John Suthers[52]); Denver (Michael Hancock[53]); Duluth, Minnesota (Emily Larson[54]); Durham, North Carolina (Steve Schewel[55]); Evansville, Indiana (Lloyd Winnecke[56]); Fairbanks, Alaska (Jim Matherly[57]); Fort Collins, Colorado (Wade Troxell[58]); Fort Wayne, Indiana (Tom Henry[59]); Fort Worth, Texas (Betsy Price[60]); Gainesville, Florida (Lauren Poe[61]); Grand Rapids, Michigan (Rosalynn Bliss[62]); Hartford, Connecticut (Luke Bronin[63]); Houston (Sylvester Turner[64]); Indianapolis, Indiana (Joe Hogsett[65]); Jacksonville, Florida (Lenny Curry[66]); Las Vegas, Nevada (Carolyn Goodman[67]); Manchester, New Hampshire (Joyce Craig[68]); Memphis, Tennessee (Jim Strickland[69]); Orlando, Florida (Buddy Dyer[70]); Philadelphia, Pennsylvania (Jim Kenney[71]); Rapid City, South Dakota (Steve Allender[72]); San Antonio, Texas (Ron Nirenberg[73]); and Springfield, Massachusetts (Domenic Sarno[74]) and Worcester, Massachusetts (Joseph Petty[75]).

[78] Incumbents Andrew Ginther in Columbus, Ohio,[79] Dan Gelber in Miami Beach, Florida,[80] and Ken McClure in Springfield, Missouri[81] were unopposed in seeking re-election.

In Flint, Michigan, state representative Sheldon Neeley defeated incumbent Karen Weaver, who was seeking a second term.

[87][88] Open mayoral seats were won in Aurora, Colorado (Mike Coffman[89]); Dallas, Texas (Eric Johnson[73]); Green Bay, Wisconsin (Eric Genrich[90]); Kansas City, Missouri (Quinton Lucas[91]); Knoxville, Tennessee (Indya Kincannon[92]); Lafayette, Louisiana (Josh Guillory[93]); Lincoln, Nebraska (Leirion Gaylor Baird[94]); Newark, Delaware (Jerry Clifton[95]); Raleigh, North Carolina (Mary-Ann Baldwin[96]); and West Palm Beach, Florida (Keith James[97]).

In South Bend, Indiana, Democrat James Mueller defeated Republican Sean Haas to replace incumbent Pete Buttigieg, who declined to run for a third term in favor of a presidential campaign.

[108][109] Mayors were successfully recalled in Wickenburg, Arizona; Brighton, Colorado; Bovill and Dalton Gardens, Idaho; Albion, Michigan; York, Nebraska; Metolius, Oregon; and Rio Bravo, Texas.

[111] In Fall River, Massachusetts, voters successfully recalled Mayor Jasiel Correia and re-elected him in the same election.

On October 15, 2019, Correia suspended his campaign,[115] and, ultimately, came in third, behind write-in votes with school board member Paul Coogan winning the election.

[170][171] Cyrus Ben defeated incumbent Tribal Chief Phyliss J. Anderson to lead the Mississippi Band of Choctaw Indians.

[172] Byron Nelson Jr. was elected tribal chairman of the Hoopa Valley Tribe, defeating incumbent Ryan Jackson.

[174] Jimmy Whiteshirt defeated incumbent Bruce Pratt in a runoff election to become president of the Pawnee Nation.

[181] Similarly, the Little Traverse Bay Bands of Odawa Indians voted to retain Regina Gasco-Bentley as tribal chairperson in a recall effort.

[182] Mashpee Wampanoag Tribal Council Chair Cedric Cromwell faced a September 15 recall election over questions about his management of tribal funds; however, the election was called off on September 12 due to questions about the recall petition process.

The remaining votes for Speaker went to several different individuals, including Republican Congressman Jim Jordan and Democratic Congresswoman Cheri Bustos.

[196][197][198] Similarly, in Belton, South Carolina, Tiffany Ownbey defeated incumbent Wendell Page, making her the first woman to be elected mayor of the city.

[203] Without providing any evidence, Republican incumbent Matt Bevin said there were "significant irregularities" in the vote count process for Kentucky governor.

[206] The following tables show the partisan results of the congressional, gubernatorial, and state legislative election races, as well as party switchers, in 2019.