Colorado

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Ark-Valley Humane Society
Chaffee County
Cat Care Society
Lakewood  
Cat Care TNR of SW Colorado
Durango
Colorado Animal Rescue Shelter
Glenwood Springs  
Community Cat Coalition of Colorado
Denver
D-SNiP
Durango  
Delta County Humane Society
Delta
Divine Feline
Statewide  
Dreampower Animal Rescue
Colorado Springs  
Dumb Friends League
Denver  
Every Creature Counts
Fort Lupton
For Pet's Sake
Cortez   
Forgotten Felines Rescue
Denver
Fort Collins Cat Rescue and Spay/Neuter Clinic
Fort Collins  
Foundation for the Protection of Animals
Durango
Grand Junction Community Cat Care
Grand Junction
Grand Valley Pets Alive
Grand Junction  
Hamlett Spay and Neuter Clinic of Colorado Springs
Colorado Springs
Humane Society of Boulder Valley
Boulder  
Humane Society of Pagosa Springs
Pagosa Springs   
Humane Society of the Pikes Peak Region
Colorado Springs  
Longmont Friends of Feral and Abandoned Cats
Longmont  
Longmont Humane Society
Longmont  
Look What The Cat Brought In
El Paso County
Mary S. Roberts Pet Adoption Center
Riverside
MaxFund
Denver   
Northern Colorado Friends of Ferals
Fort Collins  
Pet Aid Colorado
Denver  
Planned Pethood Plus
Denver   
Rocky Mountain Alley Cat Alliance
Denver  
RUFF Sanctuary
Grand Junction
Second Chance Humane Society
Multiple locations
Spay Doc
Eastern Colorado
Spay Today, Neuter Now
Denver metro area
The Cat Care Network of Colorado and New Mexico
Trinidad