| 5101 | 19 Sep 26 | Italian Fest 5K | 5K | Collinsville, IL |
| 5102 | 12 Sep 26 | Itasca Oktoberfast 5K | 5K | Itasca, IL |
| 5103 | 03 Apr 27 | ITC Community Sports parkrun | 5K | Novi, MI |
| 5104 | 13 Sep 26 | Ithaca 5 & 10 | 5K/10K | Ithaca, NY |
| 5105 | 19 Sep 26 | Ithaca Tompkins Regional Airport Runway 5K | 5K | Ithaca, NY |
| 5106 | 12 Dec 26 | ITMS Howl-iday Hustle, Run, Walk, and Play | 5K | Winter Springs, FL |
| 5107 | 12 Sep 26 | IU Indianapolis Jaguar 5K | 5K | Indianapolis, IN |
| 5108 | 27 Sep 26 | IUP College of Health Sciences Run for the Health of It 5K | 5K | Indiana, PA |
| 5109 | 27 Sep 26 | J-Hawk Latebird Race Series: Triathlon/Duathlon | Olympic/Sprint/Sprint Triathlon Relay/duathlon/supersprint triathlon | Whitewater, WI |
| 5110 | 19 Sep 26 | J.J. The Jet Plane Foundation 5K For Pediatric Cancer | 5K | Frenchburg, KY |
| 5111 | 10 Sep 26 | J.P. Morgan Corporate Challenge | 3.5M | San Francisco, CA |
| 5112 | 08 Oct 26 | J.P. Morgan Corporate Challenge - Philadelphia | 3.5M | Philadelphia, PA |
| 5113 | 19 Sep 26 | Jack 15 Road Race | 15.2M | Brookings, SD |
| 5114 | 07 Nov 26 | Jack and Allie Superhero 5K | 5K | Clermont, FL |
| 5115 | 25 Apr 27 | Jack Bristol Lake Waramaug Ultra Races | 50K/100K | Kent, CT |