Lyman is a town in York County, Maine, United States. The population was 4,344 at the 2010 census. It is part of the Portland–South Portland–Biddeford, Maine metropolitan statistical area. Lyman, together with Alfred, is home to Massabesic Experimental Forest.
According to the United States Census Bureau, the town has a total area of 40.49 square miles (104.87 km), of which, 38.99 square miles (100.98 km) of it is land and 1.50 square miles (3.88 km) is water. Lyman is drained by the Kennebunk River.
The town is crossed by U.S. Route 202 and State Routes 5, 35 and 111. It is bordered by the towns of Hollis and Dayton to the northeast, Arundel and Kennebunk to the southeast, Alfred to the southwest, and Waterboro to the northwest.
As of the census of 2010, there were 4,344 people, 1,660 households, and 1,269 families residing in the town. The population density was 111.4 inhabitants per square mile (43.0/km). There were 2,067 housing units at an average density of 53.0 per square mile (20.5/km). The racial makeup of the town was 97.8% White, 0.2% African American, 0.2% Native American, 0.4% Asian, and 1.4% from two or more races. Hispanic or Latino of any race were 0.7% of the population.
There were 1,660 households of which 31.1% had children under the age of 18 living with them, 64.6% were married couples living together, 7.5% had a female householder with no husband present, 4.3% had a male householder with no wife present, and 23.6% were non-families. 16.9% of all households were made up of individuals and 6.7% had someone living alone who was 65 years of age or older. The average household size was 2.62 and the average family size was 2.91.
The median age in the town was 43.3 years. 21.5% of residents were under the age of 18; 6.3% were between the ages of 18 and 24; 24.7% were from 25 to 44; 34.2% were from 45 to 64; and 13.2% were 65 years of age or older. The gender makeup of the town was 49.6% male and 50.4% female.
As of the census of 2000, there were 3,795 people, 1,366 households, and 1,087 families residing in the town. The population density was 97.5 people per square mile (37.6/km²). There were 1,749 housing units at an average density of 44.9 per square mile (17.3/km²). The racial makeup of the town was 98.45% White, 0.29% African American, 0.26% Native American, 0.24% Asian, 0.11% from other races, and 0.66% from two or more races. Hispanic or Latino of any race were 0.32% of the population.
There were 1,366 households out of which 37.3% had children under the age of 18 living with them, 68.6% were married couples living together, 7.2% had a female householder with no husband present, and 20.4% were non-families. 12.5% of all households were made up of individuals and 3.5% had someone living alone who was 65 years of age or older. The average household size was 2.78 and the average family size was 3.04.
In the town, the population was spread out with 26.5% under the age of 18, 6.5% from 18 to 24, 31.1% from 25 to 44, 27.7% from 45 to 64, and 8.2% who were 65 years of age or older. The median age was 38 years. For every 100 females, there were 99.3 males. For every 100 females age 18 and over, there were 95.7 males.
The median income for a household in the town was $47,860, and the median income for a family was $53,140. Males had a median income of $37,917 versus $25,192 for females. The per capita income for the town was $20,203. About 4.8% of families and 4.3% of the population were below the poverty line, including 2.4% of those under age 18 and 5.7% of those age 65 or over.