All Petco Locations - Illinois
- Algonquin
- Alton
- Bloomingdale
- Bolingbrook
- Bourbonnais
- Calumet City
- Carbondale
- Chicago
- Crystal Lake
- Dekalb
- Downers Grove
- Edwardsville
- Elmhurst
- Fairview Heights
- Geneva
- Highland Park
- Hillside
- Hodgkins
- Homewood
- Lake Zurich
- Mchenry
- Moline
- Mount Prospect
- Naperville
- Normal
- Norridge
- North Aurora
- North Riverside
- Oak Lawn
- Orland Park
- Oswego
- Palatine
- Peoria
- Quincy
- River Forest
- Rockford
- Romeoville
- Round Lake Beach
- Schaumburg
- Shorewood
- Skokie
- South Elgin
- Springfield
- St Charles
- Vernon Hills
- West Dundee
- Wheaton
- Wood Dale