[1] Primary elections were held April 26, 2016, in which Chris Van Hollen and Kathy Szeliga were chosen as the Democratic and Republican party nominees, respectively.

As typically occurs with the state's elections, most support for the Democratic nominee, Van Hollen, came from the densely populated Baltimore–Washington metropolitan area in central Maryland, while the Republican nominee, Szeliga, did well in the more sparsely populated areas on the Eastern Shore and in Western Maryland, and narrowly won Anne Arundel County, home to the state capital Annapolis, as well as exurban Frederick County.

Shortly after being sworn in for her fifth term in 2011, she succeeded Margaret Chase Smith as the longest-serving female senator in U.S. history,[2] and on March 17, 2012, she became the longest-serving female member of Congress in U.S. history, surpassing Congresswoman Edith Nourse Rogers of Massachusetts, who served from 1925 to 1960.

Representatives (current and former) Individuals Statewide politicians Organizations Szeliga won the April 26, 2016, primary in Baltimore City and each of Maryland's counties except Calvert, St. Mary's, Charles, and Prince George's, in which Chris Chaffee received more votes.

Representatives (current and former) Individuals Statewide politicians Newspapers Organizations [167] Democratic Republican Green Write-in votes cast Van Hollen 7 of 8 congressional districts.