Taylorville is a city in and the county seat of Christian County, Illinois, United States. The population was 11,246 at the 2010 census, making it the county's largest city.
Taylorville was known (in the early to mid-1990s) to have had a high rate of neuroblastoma, a cancer affecting the adrenal gland and striking children. The local power company Central Illinois Public Service Company was sued and lost for contaminating the groundwater in 1994.
Some outer homes and a business in Taylorville were damaged by an F1 tornado on April 2, 2006.
On August 11, 2012, a Beechcraft Model 18 airplane crashed into a residential area of Taylorville, killing the pilot but injuring none on the ground. A subsequent NTSB investigation into the accident concluded that an improper flap configuration and failure to maintain the correct airspeed due to pilot error, resulted in the crash.
At about 5:15 PM on December 1, 2018, as part of the December 2018 tornado outbreak, a strong tornado hit Taylorville. The tornado injured at least 26 residents and damaged more than 600 homes and businesses, 34 of which were completely destroyed. Damage surveys by the National Weather Service rated the tornado EF3 with winds over 150 mph (240 km/h).
Taylorville is located at 39°32′27″N 89°17′17″W (39.540768, −89.288005).
According to the 2010 census, Taylorville has a total area of 11.77 square miles (30.48 km2), of which 9.86 square miles (25.54 km2) (or 83.77%) is land and 1.91 square miles (4.95 km2) (or 16.23%) is water.
As of the census of 2000, there were 11,427 people, 4,856 households, and 3,039 families living in the city. The population density was 1,416.6 people per square mile (546.7/km²). There were 5,208 housing units at an average density of 645.6 per square mile (249.2/km²).