|Townships||Spring Grove, Kelly, Suez, North Henderson|
|Area||0.48 sq mi (1 km2)|
|- land||0.48 sq mi (1 km2)|
|- water||0.00 sq mi (0 km2)|
|Density||1,778.6 / sq mi (687 / km2)|
|- summer (DST)||CDT (UTC-5)|
The Warren County portion of Alexis is part of the Galesburg Micropolitan Statistical Area, while the Mercer County portion is part of the Davenport–Moline–Rock Island, IA-IL Metropolitan Statistical Area.
Alexis was first named Alexander after one of its founders, J. E. Alexander, in 1870. After learning of another Illinois town named Alexander, the founders wanted a new name. Around this time, Grand Duke Alexis was visiting the country, after whom the town was renamed.
Alexis is located at (41.063433, -90.554951).
The village is situated along the boundary between Warren and Mercer counties. In the 2000 census, 499 of Alexis' 863 residents (57.8%) lived in Warren County and 364 (42.2%) lived in Mercer County.
According to the 2010 census, the village has a total area of 0.48 square miles (1.2 km2), all land.
As of the census of 2000, there were 863 people, 361 households, and 246 families residing in the village. The population density was 1,778.6 people per square mile (680.0/km²). There were 383 housing units at an average density of 789.3 per square mile (301.8/km²). The racial makeup of the village was 99.65% White, 0.12% from other races, and 0.23% from two or more races. Hispanic or Latino of any race were 2.20% of the population.
There were 361 households out of which 28.3% had children under the age of 18 living with them, 58.7% were married couples living together, 6.6% had a female householder with no husband present, and 31.6% were non-families. 28.8% of all households were made up of individuals and 15.5% had someone living alone who was 65 years of age or older. The average household size was 2.39 and the average family size was 2.94.
In the village the population was spread out with 24.3% under the age of 18, 7.0% from 18 to 24, 25.5% from 25 to 44, 24.1% from 45 to 64, and 19.1% who were 65 years of age or older. The median age was 40 years. For every 100 females there were 88.0 males. For every 100 females age 18 and over, there were 88.7 males.
The median income for a household in the village was $36,705, and the median income for a family was $46,364. Males had a median income of $32,419 versus $19,000 for females. The per capita income for the village was $17,059. About 4.0% of families and 5.9% of the population were below the poverty line, including 4.0% of those under age 18 and 3.8% of those age 65 or over.
Alexis Fire Equipment  a manufacturer of fire engines and fire fighting related equipment is the village's largest employer.
- City data. 2000 census information Retrieved on May 16, 2007
- Origin of Name of Alexis, Illinois, USA
- "US Gazetteer files: 2010, 2000, and 1990". United States Census Bureau. 2011-02-12. Retrieved 2011-04-23.
- "Subcounty population estimates 2000-2006: Illinois" (CSV). United States Census Bureau, Population Division. 2007-06-28. Retrieved 2008-06-08.
- "Places: Illinois". 2010 Census Gazetteer Files. United States Census Bureau. Retrieved 2012-10-13.
- "American FactFinder". United States Census Bureau. Retrieved 2008-01-31.