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is a city located in McDonough County, Illinois founded in 1831. It is situated in western Illinois southwest of Galesburg at 40°27'38" North, 90°40'27" West (40.460501, -90.674048). As of 2000, the city had a population of 18,558. It is the county seat of McDonough County. According to the United States Census Bureau, the city has a total area of 10.2 square miles (26.5 km²), of which, 9.9 square miles (25.5 km²) of it is land and 0.4 square miles (1.0 km²) of it is water. The total area is 3.90% water; the East Fork La Moine River flows past the northern part of the city. Macomb is the home of Western Illinois University.
As of the census of 2000, there are 18,558 people, 6,575 households, and 2,952 families residing in the city. The population density is 1,884.2 people per square mile (727.4/km²). There are 7,037 housing units at an average density of 714.5/sq mi (275.8/km²). The racial makeup of the city is 88.73% White, 5.93% African American, 0.16% Native American, 3.06% Asian, 0.03% Pacific Islander, 0.69% from other races, and 1.40% from two or more races. 2.10% of the population are Hispanic or Latino of any race.
There were 6,575 households out of which 19.1% had children under the age of 18 living with them, 34.9% were married couples living together, 7.4% had a female householder with no husband present, and 55.1% were non-families. 38.4% of all households were made up of individuals and 12.4% had someone living alone who was 65 years of age or older. The average household size was 2.10 and the average family size was 2.77.
In the city the population was spread out with 12.6% under the age of 18, 42.9% from 18 to 24, 18.2% from 25 to 44, 14.0% from 45 to 64, and 12.4% who were 65 years of age or older. The median age was 23 years. For every 100 females there were 94.3 males. For every 100 females age 18 and over, there were 93.8 males.
The median income for a household in the city was $25,994, and the median income for a family was $42,069. Males had a median income of $27,663 versus $21,780 for females. The per capita income for the city was $13,470. 29.1% of the population and 12.2% of families were below the poverty line. 22.8% of those under the age of 18 and 8.1% of those 65 and older were living below the poverty line.