London is a city in and the county seat of Madison County, Ohio, United States. Located about southwest of the Ohio capital of Columbus, London was established in 1811 to serve as the county seat. The population was 10,279 at the 2020 census. The ZIP code is 43140. History Soon after the village was platted in the early 1810s, a Methodist church was founded in the community. Today known as First United Methodist Church, this congregation built a small log church building in 1820; it was London's first church. In the early 1900s, the church added facilities for the storage of human milk to sustain the orphanage it then operated. Geography According to the United States Census Bureau, the city has a total area of , all land. Demographics 2010 census At the 2010 census London had 9,904 residents, comprising 3,991 households and 2,511 families. The population density was . There were 4,410 housing units at an average density of . The racial makeup of the city was 89.2% White, 6.0% African American, 0.3% Native American, 1.0% Asian, 0.6% from other races, and 2.9% from two or more races. Hispanic or Latino residents of any race were 1.7%. There were 3,991 households, 32.8% of which had children under the age of 18. 41.2% of households were married couples living together; 16.2% had a female householder with no husband present; 5.4% had a male householder with no wife present; and 37.1% were non-families. 30.8% of households were made up of individuals, and 13.5% were one person aged 65 or older. The average household size was 2.43, and the average family size was 3.00. The median age was 37.1 years. 25.6% of residents were under the age of 18; 8.5% were between the ages of 18 and 24; 26.7% were from 25 to 44; 24.6% were from 45 to 64; and 14.6% were 65 or older. The gender makeup of the city was 46.9% male and 53.1% female. 2000 census At the 2000 census there were 8,771 people in 3,590 households, including 2,301 families, in the city. The population density was 1,031.0 people per square mile (397.9/km). There were 3,848 housing units at an average density of 452.3/sq mi (174.6/km). The racial makeup of the city was 89.96% White, 6.78% African American, 0.30% Native American, 0.42% Asian, 0.02% Pacific Islander, 0.42% from other races, and 2.10% from two or more races. Hispanic