The story so far
from Wikipedia & the U.S. CensusMercer Township is located in Mercer County, Illinois. As of the 2010 census, its population was 4,071 and it contained 1,873 housing units. Mercer Township changed its name from Centre Township on an unknown date sometime before 1921. Mercer Township contains Aledo, the county seat of Mercer County.
Between the 2010 and 2020 censuses its population fell from 4,071 to 3,964 (-3%). Half of its homes were built before 1956.
Wikipedia doesn’t have a history of Mercer yet — the old photos, dates and memories neighbors add here are how it gets written.
Intro from Wikipedia, licensed CC BY-SA 4.0. Population and housing: U.S. Census Bureau.
Start Mercer’s collection
The first neighbors to add old photos shape how Mercer’s history is told.
0 of 10 decades since 1900 have photos 📦Share a family photoSign in to add one+10Famous people close to Mercer
See all 21 →Mercer, decade by decade
2000
1 historic place in Mercer
Mercer has 1 listing on the National Register, and they protect 11 historic buildings, because Mercer County Fairgrounds alone counts 11.
Where they are
When they were listed
Then & now
When neighbors add old photos, retakes from the same spot appear here side by side.



