Farmington is a city in Fulton County & Peoria County, Illinois, United States. It is north of Canton, west of Peoria, southeast of Galesburg, and northeast of Macomb. The population was 2,448 at the 2010 census, down from 2,601 at the 2000 census. The public speculative system is Farmington Central Community Unit School District 265, which includes Farmington Central High School. Because it is in Fulton County, it is a allowance of the Canton Micropolitan Area and the wider Peoria Consolidated Statistical Area.

Farmington was founded circa 1827. The area was first inhabited by members of the Potawatomi tribe. The city is named after Farmington, Connecticut.

Before and during the Civil War, the city was operating in the Underground Railroad, and there are several enduring homes that were safehouses. In the early 1900s, many Italian immigrants approved in Farmington.

Farmington is located in the northeast corner of Fulton County at 40°41′56″N 90°0′13″W / 40.69889°N 90.00361°W / 40.69889; -90.00361 (40.698855, -90.003673). Illinois Routes 78 and 116 pass through the center of the city. IL 116 enters from the north as North Main Street, and IL 78 enters from the south as South Main Street. The two highways leave the city to the east on East Fort Street. IL 78 leads north 42 miles (68 km) to Kewanee and south 10 miles (16 km) to Canton, the largest city in Fulton County, while IL 116 leads east 22 miles (35 km) to Peoria and west 22 miles to St. Augustine.