is in central Macoupin County. Illinois Routes 4 and 108 pass through the city center, joining as East 1st South Street through the city's east side. Route 4 leads north-northeast to Springfield, the state capital, and south to Staunton, while Route 108 leads east to Interstate 55 and west to Carrollton. According to the U.S. Census Bureau, Carlinville has a total area of , all land. Briar Creek passes through the east side of the city, joining Macoupin Creek just south of the city limits. Macoupin Creek is a west-flowing tributary of the Illinois River. Climate Demographics As of the census of 2000, there were 5,685 people, 2,125 households, and 1,393 families residing in the city. The population density was . There were 2,289 housing units at an average density of . The racial makeup of the city was 97.01% White, 1.50% African American, 0.25% Native American, 0.26% Asian, 0.02% Pacific Islander, 0.23% from other races, and 0.74% from two or more races. Hispanic or Latino of any race were 0.76% of the population. There were 2,125 households, of which 31.1% had children under the age of 18 living with them, 50.3% were married couples living together, 11.3% had a female householder with no husband present, and 34.4% were non-families. 30.1% of all households were made up of individuals, and 15.9% had someone living alone who was 65 years of age or older. The average household size was 2.38 and the average family size was 2.96. In the city, the population was spread out, with 23.4% under the age of 18, 12.8% from 18 to 24, 25.1% from 25 to 44, 19.4% from 45 to 64, and 19.4% who were 65 years of age or older. The median age was 37 years. For every 100 females, there were 89.7 males. For every 100 females age 18 and over, there were 84.1 males. The median income for a household in the city was $34,259, and the median income for a family was $39,693. Males had a median income of $35,137 versus $21,286 for females. The per capita income for the city was $16,663. About 9.0% of families and 12.5% of the population were below the poverty line, including 15.3% of those under age 18 and 14.6% of those age 65 or over. Transportation Illinois Route 4 passes north to south through Carlinville. Interstate 55 passes east of the city. Illinois Route