|Elevation||670 ft (204 m)|
|Area||0.54 sq mi (1 km2)|
|- land||0.54 sq mi (1 km2)|
|- water||0.00 sq mi (0 km2)|
|Density||2,028.8 / sq mi (783 / km2)|
|- summer (DST)||CDT (UTC-5)|
|Wikimedia Commons: Flanagan, Illinois|
Flanagan is located at .
According to the 2010 census, the village has a total area of 0.54 square miles (1.4 km2), all land. A small man-made lake (originally four separate lakes, some being filled in), called the Legion Lake, exists on the west side of the village. A walking trail surrounds it and a park shelter is located on the site. Artesian Park, another small park within the village boundaries, is located on the east side of town. It boasts two picnic shelters, a tennis court and playground equipment. A small business district of roughly 1 block in length is located in the center of town. Just north of this, the Flanagan Co-op can be found, a complex of several grain elevators and silos at Main and Lumber Streets.
As of the census of 2000, there were 1,083 people, 447 households, and 298 families residing in the village. The population density was 2,028.8 people per square mile (789.0/km²). There were 475 housing units at an average density of 889.8 per square mile (346.0/km²). The racial makeup of the village was 98.61% White, 0.18% African American, 0.18% Asian, 0.09% from other races, and 0.92% from two or more races. Hispanic or Latino of any race were 0.18% of the population.
There were 447 households out of which 28.6% had children under the age of 18 living with them, 59.3% were married couples living together, 6.0% had a female householder with no husband present, and 33.3% were non-families. 30.0% of all households were made up of individuals and 17.0% had someone living alone who was 65 years of age or older. The average household size was 2.29 and the average family size was 2.86.
In the village the population was spread out with 22.5% under the age of 18, 5.7% from 18 to 24, 23.5% from 25 to 44, 21.8% from 45 to 64, and 26.5% who were 65 years of age or older. The median age was 44 years. For every 100 females there were 84.2 males. For every 100 females age 18 and over, there were 78.1 males.
The median income for a household in the village was $39,479, and the median income for a family was $49,167. Males had a median income of $30,875 versus $21,359 for females. The per capita income for the village was $19,767. About 2.6% of families and 4.9% of the population were below the poverty line, including 4.6% of those under age 18 and 9.6% of those age 65 or over.
- "US Gazetteer files: 2010, 2000, and 1990". United States Census Bureau. 2011-02-12. Retrieved 2011-04-23.
- "2010 Census U.S. Gazetteer Files for Places – Illinois". United States Census. Retrieved 2012-10-13.
- "American FactFinder". United States Census Bureau. Retrieved 2008-01-31.