Red Bud is a city in Randolph County, Illinois, in the United States. The population was 3,698 at the 2010 census.
Red Bud is located at 38°12′37″N 89°59′47″W / 38.210205°N 89.996494°W / 38.210205; -89.996494.
According to the 2010 census, Red Bud has a total area of 2.453 square miles (6.35 km), of which 2.43 square miles (6.29 km) (or 99.06%) is land and 0.023 square miles (0.06 km) (or 0.94%) is water.
Red Bud lies in the northwestern part of Randolph County and is bounded on the north and west by Monroe County, on the east by the Kaskaskia River, and on the south by Ruma and Horse creeks. Originally it was two-thirds rich rolling prairie, with good timber bordering the Kaskaskia.
As of the census of 2000, there were 3,422 people, 4,370 households, and 935 families residing in the city. The population density was 1,626.3 people per square mile (629.2/km²). There were 1,462 housing units at an average density of 694.8 per square mile (268.8/km²). The racial makeup of the city was 98.71% White, 0.32% Asian, 0.09% from other races, and 0.88% from two or more races. Hispanic or Latino of any race were 0.88% of the population.
There were 1,370 households out of which 31.5% had children under the age of 18 living with them, 55.0% were married couples living together, 10.2% had a female householder with no husband present, and 31.7% were non-families. 28.4% of all households were made up of individuals and 16.4% had someone living alone who was 65 years of age or older. The average household size was 2.40 and the average family size was 2.95.
In the city, the population was spread out with 23.2% under the age of 18, 8.1% from 18 to 24, 25.9% from 25 to 44, 23.0% from 45 to 64, and 19.9% who were 65 years of age or older. The median age was 40 years. For every 100 females, there were 86.4 males. For every 100 females age 18 and over, there were 81.8 males.
The median income for a household in the city was $40,300, and the median income for a family was $50,280. Males had a median income of $36,049 versus $20,957 for females. The per capita income for the city was $19,967. About 6.0% of families and 9.4% of the population were below the poverty line, including 10.1% of those under age 18 and 13.0% of those age 65 or over.