Andalusia is a village in Rock Island County, Illinois, United States. The population was 1,184 at the 2020 census, up from 1,178 at the 2010 census.

Andalusia is located along the Mississippi River at 41°26′26″N 90°43′15″W / 41.44056°N 90.72083°W / 41.44056; -90.72083 (41.440431, -90.720932).

According to the 2010 census, Andalusia has a total area of 1.181 square miles (3.06 km), of which 1.18 square miles (3.06 km) (or 99.92%) is land and 0.001 square miles (0.00 km) (or 0.08%) is water.

Historical population

Census	Pop.	Note	%±
1890	281		—
1900	326		16.0%
1910	299		−8.3%
1920	228		−23.7%
1930	252		10.5%
1940	365		44.8%
1950	510		39.7%
1960	560		9.8%
1970	950		69.6%
1980	1,238		30.3%
1990	1,052		−15.0%
2000	1,050		−0.2%
2010	1,178		12.2%
2020	1,184		0.5%
U.S. Decennial Census

At the 2000 census there were 1,050 people, 402 households, and 307 families living in the village. The population density was 1,463.4 inhabitants per square mile (565.0/km). There were 415 housing units at an average density of 578.4 per square mile (223.3/km). The racial makeup of the village was 97.05% White, 0.57% African American, 0.10% Native American, 0.76% from other races, and 1.52% from two or more races. Hispanic or Latino of any race were 2.19%.

Of the 402 households 34.1% had children under the age of 18 living with them, 63.2% were married couples living together, 10.7% had a female householder with no husband present, and 23.4% were non-families. 18.9% of households were one person and 8.0% were one person aged 65 or older. The average household size was 2.61 and the average family size was 3.02.

The age distribution was 24.7% under the age of 18, 9.1% from 18 to 24, 29.5% from 25 to 44, 26.2% from 45 to 64, and 10.5% 65 or older. The median age was 39 years. For every 100 females, there were 93.7 males. For every 100 females age 18 and over, there were 91.1 males.

The median household income was $46,552 and the median family income was $56,250. Males had a median income of $37,438 versus $25,179 for females. The per capita income for the village was $20,626. About 3.1% of families and 2.9% of the population were below the poverty line, including 2.8% of those under age 18 and 11.1% of those age 65 or over.

• Official Website
• Rock Island County Historical Society