|Area||4.39 sq mi (11 km2)|
|- land||4.39 sq mi (11 km2)|
|- water||0.01 sq mi (0 km2)|
|Density||1,607.0 / sq mi (620 / km2)|
|- summer (DST)||CDT (UTC-5)|
|Wikimedia Commons: Geneseo, Illinois|
Geneseo is a variation of the Native American word Genesee, meaning "shining valley" or "beautiful valley".
According to the 2010 census, the city has a total area of 4.39 square miles (11.4 km2), of which 4.39 square miles (11.4 km2) (or 100%) is land and 0.01 square miles (0.026 km2) (or 0.23%) is water.
Geneseo is known for its Victorian style homes, historic architecture, many parks, and friendly hometown atmosphere.
Geneseo has many mature maple trees lining their boulevards which provide a spectacular fall color show. The city is home to the Maple Leafs football team which has won many state championships. On Tuesday nights throughout the summer, various Geneseo civic groups host ice cream socials in the city park with the Maple City Band as well as other local music groups playing music in the city's bandshell. On Father's Day weekend, Geneseo celebrates an annual Music Festival which includes various music groups, parade, ice cream social, as well as arts and craft vendors in the city park. During the month of December, Geneseo hosts an annual "Christmas Walk." Until 2008 the annual "Christmas Walk" was known as the "Victorian Walk." Downtown businesses offer in store hospitality and feature live window displays depicting holiday traditions from different decades, 2008 will feature the 1940s.
This town is also home to the famous gun manufacturing company, Springfield Armory, Inc. which is located on Main Street. It employs many of the town's citizens and is a vital part of the economy. Springfield Armory, Inc. is currently operated by the Reese family.
The high school team is well known for its football and music program. The Geneseo Maple Leafs have won the State Championships 4 times in football, with 6 second-place state finishes, along with 6 State Championships in music. 
The city government is organized under an Aldermanic form. The Mayor is elected at large for a two year term. The Mayor (Nadine Palmgren) serves as Chief Executive Officer and also Presiding Officer over the City Council of Geneseo. The City Council consists of eight aldermen representing four individual wards. (Ward 1, Justin Snodgrass and Carl Freeman- Ward 2, James Roodhouse and Robert Wachtel - Ward 3, Keith Kennett and Howard Beck - Ward 4, S. Jason Robinson and Douglas Crow)
As of the census of 2000, there were 6,480 people, 2,707 households, and 1,810 families residing in the city. The population density was 1,607.0 people per square mile (620.8/km²). There were 2,854 housing units at an average density of 707.8 per square mile (273.4/km²). The racial makeup of the city was 98.56% White, 0.19% African American, 0.09% Native American, 0.35% Asian, 0.02% Pacific Islander, 0.28% from other races, and 0.51% from two or more races. Hispanic or Latino of any race were 0.94% of the population.
There were 2,707 households out of which 30.0% had children under the age of 18 living with them, 56.3% were married couples living together, 7.6% had a female householder with no husband present, and 33.1% were non-families. 30.7% of all households were made up of individuals and 18.7% had someone living alone who was 65 years of age or older. The average household size was 2.35 and the average family size was 2.94.
In the city the population was spread out with 24.4% under the age of 18, 6.0% from 18 to 24, 25.4% from 25 to 44, 23.0% from 45 to 64, and 21.3% who were 65 years of age or older. The median age was 41 years. For every 100 females there were 89.4 males. For every 100 females age 18 and over, there were 84.0 males.
The median income for a household in the city was $40,760, and the median income for a family was $51,455. Males had a median income of $38,990 versus $22,794 for females. The per capita income for the city was $20,115. About 3.3% of families and 5.3% of the population were below the poverty line, including 4.3% of those under age 18 and 6.7% of those age 65 or over.
- Earnest Elmo Calkins, advertising executive
- Jack Wanner, MLB shortstop for the New York Highlanders
- Barry Pearson, NFL wide receiver for the Pittsburgh Steelers and Kansas City Chiefs
- "2010 US Census". Census.gov. US Department of Commerce. Retrieved 18 June 2014.
- Gannett, Henry (1905). The Origin of Certain Place Names in the United States. Govt. Print. Off. pp. 135–136.
- "2010 Census U.S. Gazetteer Files for Places - Illinois". United States Census. Retrieved 2012-05-03.
- "Homepage". Geneseo Football. Retrieved 20 July 2015.
- "Annual Estimates of the Resident Population for Incorporated Places: April 1, 2010 to July 1, 2014". Retrieved June 4, 2015.
- "Census of Population and Housing". Census.gov. Retrieved June 4, 2015.
- "American FactFinder". United States Census Bureau. Retrieved 2008-01-31.