All GNC Locations - Illinois
- Alton
- Aurora
- Bannockburn
- Bartlett
- Batavia
- Belleville
- Bloomingdale
- Bloomington
- Bolingbrook
- Bourbonnais
- Broadview
- Buffalo Grove
- Calumet City
- Carbondale
- Carol Stream
- Champaign
- Chicago
- Chicago Heights
- Chicago Ridge
- Collinsville
- Crestwood
- Crystal Lake
- Danville
- Deer Park
- Dekalb
- Des Plaines
- Downers Grove
- Edwardsville
- Effingham
- Elgin
- Elk Grove Village
- Elmhurst
- Evergreen Park
- Fairview Heights
- Forsyth
- Fox Lake
- Frankfort
- Galesburg
- Glen Ellyn
- Glenview
- Great Lakes
- Gurnee
- Harrisburg
- Hillside
- Hodgkins
- Hoffman Estates
- Homer Glen
- Jacksonville
- Joliet
- Lake In The Hills
- Lake Zurich
- Libertyville
- Lincolnwood
- Lombard
- Machesney Park
- Marion
- Matteson
- Mattoon
- Mchenry
- Merrionette Park
- Moline
- Mount Prospect
- Mount Vernon
- Mundelein
- Naperville
- Niles
- North Riverside
- Northlake
- Oak Park
- Orland Park
- Oswego
- Palatine
- Pekin
- Peoria
- Peru
- Plainfield
- Quincy
- Rockford
- Rolling Meadows
- Romeoville
- Round Lake Beach
- Schaumburg
- Silvis
- Skokie
- South Elgin
- Springfield
- St Charles
- Sterling
- Swansea
- Tinley Park
- Vernon Hills
- Wauconda
- Waukegan
- West Dundee
- Wheaton
- Wilmette
- Wood Dale
- Wood River
- Woodridge
- Yorkville