Merrill is a city in Lincoln County, Wisconsin, United States. The population was 10,146 at the 2000 census. The city is located to the south of and adjacent to the Town of Merrill.
The Merrill area had a 2000 census population of 16,289, and comprises the core of the United States Census Bureau's Merrill MSA, which includes all of Lincoln County (2000 population: 29,641). Together with the Wausau MSA (which includes all of Marathon County, 2000 population: 125,834) it forms the Wausau-Merrill CSA. As of the 2000 census, the CSA's total population was 155,475.
Merrill was originally a logging town by the name of Jenny Bull Falls. The settlement commenced with a trading post in 1843. The name was changed to Merrill in honor of S.S. Merrill, the general manager of the Chicago, Milwaukee, St. Paul, and Pacific Railroad. The railroad and passenger depot, a hub of social activity through the lumber industry's boom years and after, became a community youth center, but has since been razed. By 1900, the timber industry was in decline and the community was compelled to diversify its economy.