Chicago Hash House Harriers
- Running club that runs every week, Winter on Sundays, and Summer on Monday nights. Features events calendar, membership information and social networking.
- http://www.chicagohash.com/

Chicago 1/2 Marathon
- Half marathon. Features online registration, event information, results, directions and parking information, and expo details.
- http://www.chicagohalfmarathon.com/

Chicago Lakefront 50K and 50M
- Registration, location and course details are provided for this annual ultramarathon event. Features both a 50 kilometer and 50 mile run.
- http://www.chicagoultra.org/

RunBig Chicago Clydesdales
- Provides resources, articles and links of interest to area Clydesdale (men) and Athena (women) runners and multisport athletes.
- http://orik.com/runbig/

CARA - Chicago Area Runners Association
- Provides training programs for various distances and levels, clinics, events and results calendar, locations, racing circuit, safety information and fun runs.
- http://www.cararuns.org/

Chicago Marathon
- Annual event held in October; event information, registration, past results, photo gallery, downloads, training and merchandise provided.
- http://www.chicagomarathon.com/