Beresford is a city in Lincoln and Union counties in the U.S. state of South Dakota. The population was 2,005 as of the 2010 census. The southern two-thirds is part of the Sioux City, IA–NE–SD Metropolitan Statistical Area, while the northern one-third is part of the Sioux Falls Metropolitan Statistical Area. The Beresford Republic is the weekly newspaper. According to the United States Census Bureau, the city has a total area of 1.78 square miles (4.62 km²), all of it land. Beresford is located on the border between Lincoln and Union counties; the border between the counties is located along Beresford's Cedar Street. Approximately two-thirds of Beresford's area (including its city hall building) is located in Union County.