New York's 26th congressional district is a congressional district for the United States House of Representatives in Western New York. It includes parts of Erie and Niagara counties. The district includes the cities of Buffalo, Lackawanna, Niagara Falls, Tonawanda, and North Tonawanda.

Erie County is a county along the shore of Lake Erie in western New York State. As of the 2020 census, the population was 954,236. The county seat is Buffalo, which makes up about 28% of the county's population. Both the county and Lake Erie were named for the regional Iroquoian language-speaking Erie tribe of Native Americans, who lived in the area before 1654. They were later pushed out by the more powerful Iroquoian nations tribes. The county is part of the Western New York region of the state.