Carpentersville is a village in Kane County, Illinois, United States. The population was 37,691 at the 2010 census.
Julius Angelo Carpenter (August 19, 1827 – March 30, 1880) was the founder of Carpentersville, Illinois and its first prominent citizen. The electric interurban railroad came to Carpentersville in 1896. The line was built by the Carpentersville, Elgin and Aurora Railway from a connection with the streetcar system in Elgin, Illinois.Until the 1950s, Carpentersville consisted of a street grid along the Fox River centered around Main Street, which was the only highway bridge across the Fox River between Algonquin and Dundee.