Piatt County Illinois - Government Site
Population: 16,688
Area: 440 square miles
County Seat: Monticello
Area Code(s) in use: 217
Time Zone: CST
Adjacent counties:
Champaign De Witt Douglas Macon McLean Moultrie
Airport
Ashworth Landing Strip, Bartram Landing Strip, Clapper Airport, Kirwan Landing Strip, Marvin D Bradd Airport, Morris Farm Incorporated Airport, Niklaus RLA Airport, Norfleet Farms Airport, Piatt County Airport, Robert A Ashworth Airport, Spence Landing Strip, Triple Creek Airport, Van Gorder Airport, Weidner Landing Field, White Landing Strip
Bridge
County Line Bridge, Hog Chute Bridge
Building
Allerton Public Library, Mansfield Public Library, Monticello and Sangamon Valley Railway Museum, Monticello City Hall, Piatt County Courthouse, Piatt County Jail
Canal
Ditch Number 4, Friends Creek Ditch, Hammond Mutual Ditch, Unity Number 3 Ditch, Washington Elementary School
Cemetery
Antioch Cemetery, Argo Cemetery, Ater Cemetery, Bement Cemetery, Blue Ridge Cemetery, Boyer Cemetery, Bucks Pond Cemetery, Camp Creek Cemetery, Cerro Gordo Cemetery, Clover Cemetery, County Cemetery, Cronninger Cemetery, Deland Cemetery, Dillow Family Cemetery, Dooley Family Cemetery, Dunkard Cemetery, Hammond Cemetery, Haneline Cemetery, Hughes Cemetery, Ingram Cemetery, Kentuck Cemetery, Lake Fork Cemetery, LaPlace Cemetery, Long Cemetery, Mackey Cemetery, Mackville Cemetery, Madden Cemetery, Mallory Cemetery, Mansfield Cemetery, Marquiss Cemetery, Monticello Cemetery, Monticello Cemetery, Moore Cemetery, Morain Cemetery, Mosgrove Cemetery, Old Monticello Cemetery, Pioneer Cemetery, Stringtown Cemetery, Van Meter Cemetery, Warfield Family Cemetery, West France Cemetery, Willow Branch Cemetery, Woolington Cemetery
Church
Bement Baptist Church, Bement United Methodist Church, Bethel Church, Calvary Baptist Church, Church of Christ, Church of Christ, Church of God (historical), Church of the Nazarene, First Baptist Church, First Baptist Church of Monticello, First Christian Church, First Christian Church, First Presbyterian Church, First Presbyterian Church, First United Methodist Church, Hammond United Methodist Church, Kentucky Church (historical), Lake Fork United Church of Christ, Mansfield United Methodist Church, Monticello Assembly of God Church, Saint Michaels Roman Catholic Church, Saint Philomenas Church, United Methodist Church of Cerro Gordo
Civil
Piatt County, Township of Bement, Township of Blue Ridge, Township of Cerro Gordo, Township of Goose Creek, Township of Monticello, Township of Sangamon, Township of Unity, Township of Willow Branch
Crossing
Interchange 166, Interchange 53, Interchange 61, Interchange 63, Interchange 66, Interchange 69
Dam
Four H Memorial Lake Dam
Hospital
Kirby Hospital
Lake
Buck Pond (historical)
Locale
Monticello Golf Club, Monticello Water Works
Park
Allerton State Park, Atwood Park, Bement County Forest Preserve, Forest Preserve Park, Lodge Park, Richey Park, Sangamon Park
Populated Place
Amenia, Bement, Blue Ridge, Bodmann, Burrowsville, Centerville, Cerro Gordo, Cisco, Combs, De Land, Galesville, Hammond, Harris, LaPlace, Lintner, Lodge, Mackville, Mansfield, Milmine, Monticello, Piatt, Pierson, Voorhies, White Heath
Post Office
Bement Post Office, La Place Post Office, Monticello Post Office, White Heath Post Office
Reservoir
Arrowhead Lake, Four-H Lake
School
Ashland School (historical), Atwood-Hammond Elementary School, Atwood-Hammond High School, Bement Elementary School, Bement High School, Blue Ridge Junior High School, Camp Creek School (historical), Cerro Gordo Elementary School, Cerro Gordo High School, Cerro Gordo Junior High School, Dighton School (historical), East Cisco School (historical), Elwood School (historical), Enterprise School (historical), Excelsior School (historical), Fairview School (historical), Haneline School (historical), Independent School (historical), Kentucky School (historical), Klinger School (historical), Lincoln Elementary School, Madden School (historical), Mansfield Elementary School, McGath School (historical), Monticello Christian Academy, Monticello High School, Morain School (historical), Mount Vernon School (historical), New Union School (historical), Piatt School (historical), Pleasant Falls School (historical), Pleasant Grove School (historical), Prospect School (historical), Ridge School (historical), Slabtown School (historical), South Prairie School (historical), Stringtown School (historical), Sunny Mound School (historical), Victory School (historical), Warren School (historical), Watson School (historical), West Point School (historical), Western School (historical), White Heath Elementary School, Wildcat School (historical), Wisegarver School (historical)
Stream
Blue Ridge Special Creek, Camp Creek, East Lake Fork, Goose Creek, Lake Fork Special Ditch, Lone Tree Creek, Madden Creek, Wildcat Creek, Willow Branch
Tower
WILL-FM (Urbana), WILL-TV (Urbana), WVLJ-FM (Monticello)
| Race | Population |
| White |  16,410 |
| Mixed | 111 |
| Asian | 79 |
| Black | 68 |
| American Indian | 17 |
| Hawaiian & Pacific Islander | 3 |
| Additional population tables : | |
| State population table | |
| Illinois population by county | |