How many of the largest cities’ mayors are affiliated with a political party?

In most of the nation’s largest cities, mayoral elections are officially nonpartisan, though many officeholders and candidates are affiliated with political parties.
The mayors of 62 of the nation’s 100 largest cities are Democrats. There are 29 Republican mayors, four independents, four nonpartisan mayors, and one of unknown affiliation.
As part of Ballotpedia’s coverage of the 100 largest U.S. cities, we are tracking the 2019 mayoral elections in those cities and noting partisan changes that may occur. Thirty-one mayoral elections in those cities are being held in 2019. In 20 of those cities, the incumbent was Democratic at the start of 2019. Seven incumbents were Republican, three were independent, and the affiliation of one was unknown.
In the 10 largest U.S. cities, eight mayors are Democrats, one is Republican, and one is independent.
2019 is a mayoral election year in six of those cities: Chicago, Houston, Philadelphia, Phoenix, San Antonio, and Dallas, Texas. Five of those cities began the year with a Democratic mayor and one (San Antonio), with an independent mayor.
One partisan change has taken place in 2019. Voters in Phoenix elected Kate Gallego (D) in a nonpartisan mayoral runoff election on March 12, 2019. Gallego succeeded Thelda Williams, a Republican. The general election was held on November 6, 2018.
Democratic mayors oversaw 67 of the 100 largest cities at the beginning of 2016, 64 at the beginning of 2017, 63 at the start of 2018, and 61 at the start of 2019.
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