Trilla is an unincorporated community in Pleasant Grove Township, Coles County, Illinois, United States.
As of the 2020 census, Trilla had a population of 156.
Trilla first appeared as a census designated place in the 2020 U.S. census.
Coles County Zipline provides dial-a-ride bus transit service to the city. The nearest passenger rail service is at Mattoon station, where Amtrak operates to Chicago, Carbondale, New Orleans, and other destinations.
It is in the Mattoon Community Unit School District 2. The district's comprehensive high school is Mattoon High School.