Ultrarunner.net
The UltraRunning link for U.S.
| Alpine Runners | Lake Zurich |
| Alton Road Runners | Alton |
| Cary Hillstriders Running Club | Crystal Lake |
| Decatur Running Club | Decatur |
| Fox River Trail Runners | Geneva |
| Galesburg Road Runners Club | Galesburg |
| Hillstriders Running Club | Crystal Lake |
| Illinois Valley Striders | Peoria |
| Kennekuk Road Runners | Danville |
| Lake Run Club | Bloomington |
| Lincoln Park Pacers Running Club | |
| Lisle Windrunners | Lisle |
| Miowest Trail & ultra running Assoc. | Peoria, |
| Oak Park Runners Club | Oak Park |
| Prairie State Roadrunners | New Lenox |
| River To River Runners | Herrin |
| Rockford Road Runners> | Rockford |
| Running Fools | Wheaton |
| ST. Jude Runners Association | Peoria |
| Second Wind Running Club | Champaign |
| Springfield RRC | Springfield |
| St. Jude Runners Association | Peoria |
| Starved Rock Runners Ltd | Wenona |
| The Cutting Edge Running Club | Springfield |
| US Athletics | Edwardsvillle |
| Walnut Grove Roadrunners | Eureka |