New Jersey's 7th congressional district includes all of Hunterdon and Warren Counties; and parts of Morris, Somerset, Sussex, and Union Counties. The district is represented by Republican Thomas Kean Jr., who was first elected in 2022, defeating Democratic incumbent Tom Malinowski. The district, which has become more ethnically diverse over time, is one of the most affluent congressional districts in the United States, with the fifth-highest median income in the nation. Counties and municipalities in the district For the 118th and successive Congresses (based on redistricting following the 2020 Census), the district contains all or portions of six counties and 93 municipalities. Hunterdon County (24): All 24 municipalities Morris County (12): Chester Borough, Chester Township, Long Hill Township, Mendham Borough, Mendham Township (part; also 11th), Mine Hill Township, Mount Arlington, Mount Olive Township, Netcong, Roxbury Township, Washington Township and Wharton Somerset County (13): Bedminster Township, Bernards Township, Bernardsville, Branchburg Township, Bridgewater Township (part; also 12th), Far Hills, Green Brook Township, Hillsborough Township (part; also 12th), Peapack-Gladstone, Raritan, Somerville, Warren Township and Watchung Sussex County (10): Andover Borough, Byram, Fredon, Green Township, Hopatcong, Ogdensburg, Sparta, Stanhope, Stillwater, and Walpack Union County (12): Berkeley Heights, Clark, Fanwood, Linden (part; also 10th), Mountainside, New Providence, Rahway, Scotch Plains, Springfield, Summit, Westfield and Winfield Township Warren County (22): All 22 municipalities History In the 2012 general election, Republican incumbent Leonard Lance held his seat against Democratic challenger Upendra J. Chivukula. In the 2010 general election, Democratic challenger Ed Potosnak challenged Lance, but Lance defeated Potosnak by a margin of 59% to 41%. For the 2012 election, both Potosnak and former Edison Mayor Jun Choi announced their candidacies for the Democratic nomination. Choi dropped out of the race in December 2011 after redistricting left his Edison home outside the 7th District. Potosnak dropped out of the race in January 2012 to take a position as executive director of the New Jersey League of Conservation Voters, leaving a momentarily empty field for the Democratic nomination. Effect of 2000 redistricting New Jersey's 7th district and the 12th district were redistricted after the 2000 census by a bipartisan panel. By consensus of the panel, the Democratic and Republican parties agreed to trade areas in the two districts to make them safer for their respective incumbents. It is likely that this tradeoff, which made New Jersey's 7th less competitive for Democrats, had an effect on the outcome of 2006