Nevada's 4th congressional district is a congressional district that was created as a result of the 2010 United States census. Located in the central portion of the state, it includes most of northern Clark County, southern Lyon County, most of Lincoln County, a sliver of Churchill County and all of Esmeralda, Mineral, and Nye counties. With a Cook Partisan Voting Index rating of D+3, it is the equal most Democratic districts in Nevada, along with Nevada’s 1st congressional district.

Lyon County is a county in the U.S. state of Nevada. As of the 2020 census, the population was 59,235. Lyon County comprises the Fernley, NV Micropolitan Statistical Area which is part of the Reno-Carson City-Fernley, NV Combined Statistical Area.