Organizations
Largest first
By revenue on the last return. Organizations that file Form 990-N report no figures and come last.
| Organization | Return | Revenue |
|---|---|---|
| Denver Dumb Friends LeagueDenver | Form 990 | $92,897,062FY2025 |
| Denver Zoological Foundation IncDenver | Form 990 | $66,039,623FY2025 |
| The Wild Animal Sanctuary a Colorado Non-Profit CorporationKeenesburg | Form 990 | $38,304,328FY2025 |
| Cheyenne Mountain Zoological SocietyColorado Springs | Form 990 | $34,386,132FY2026 |
| Humane Society of the Pikes Peak RegionColorado Springs | Form 990 | $21,526,597FY2024 |
| Morris Animal FoundationDenver | Form 990 | $17,312,374FY2025 |
| Noco HumaneLoveland | Form 990 | $13,540,762FY2026 |
| True Companions IncDenver | Form 990 | $11,286,636FY2025 |
| Rocky Mountain Bird ObservatoryBrighton | Form 990 | $11,103,618FY2025 |
| The Humane Society of Boulder Valley IncBoulder | Form 990 | $8,546,693FY2025 |
| Rocky Mountain Butterfly ConsortiumWestminster | Form 990 | $8,279,543FY2025 |
| Environment for the Americas IncBoulder | Form 990 | $6,989,701FY2024 |
| Animal Friends AllianceFort Collins | Form 990 | $5,681,276FY2025 |
| Longmont Humane Society IncLongmont | Form 990 | $5,289,153FY2024 |
| Native American Fish & Wildlife SocietyNorthglenn | Form 990 | $4,686,340FY2025 |
| Colorado Pet PantryBoulder | Form 990 | $4,197,522FY2025 |
| Colorado Horse RescueLongmont | Form 990 | $3,573,081FY2025 |
| Wildlife Protection SolutionsGolden | Form 990 | $3,333,739FY2024 |
| Cat Care SocietyLakewood | Form 990 | $3,311,480FY2025 |
| La Plata County Humane SocietyDurango | Form 990 | $3,213,203FY2024 |
| Dogs Playing for LifeLongmont | Form 990 | $2,978,488FY2025 |
| Pueblo Zoological SocietyPueblo | Form 990 | $2,946,096FY2025 |
| Planned Pethood InternationalConifer | Form 990 | $2,463,647FY2025 |
| Colorado Wolf and Wildlife CenterDivide | Form 990 | $2,351,170FY2024 |
| Friends of Foothills Animal ShelterGolden | Form 990 | $2,120,126FY2024 |
| American Birding Association IncColorado Springs | Form 990 | $2,118,882FY2025 |
| Second Chance Humane Society IncRidgway | Form 990 | $2,065,208FY2025 |
| Golden Retriever Rescue of the RockiesArvada | Form 990 | $2,032,461FY2025 |
| Soul Dog RescueFort Lupton | Form 990 | $1,861,232FY2024 |
| Pet Sustainability CoalitionBoulder | Form 990 | $1,797,130FY2025 |
| Humane Society of the South Platte Valley IncLittleton | Form 990 | $1,756,051FY2025 |
| Ark-Valley Humane Society IncBuena Vista | Form 990 | $1,700,580FY2025 |
| Greenwood Wildlife Rehabilitation CenterBoulder | Form 990 | $1,667,703FY2024 |
| Hamlett Spay and Neuter Clinic of Colorado SpringsColorado Springs | Form 990 | $1,651,313FY2025 |
| South Platte Water Related Activities Program IncSterling | Form 990 | $1,650,715FY2024 |
| Street Dog CoalitionFort Collins | Form 990 | $1,549,397FY2025 |
| Longhopes Donkey Shelter IncBennett | Form 990 | $1,508,693FY2025 |
| Roice-Hurst Humane Society IncGrand Junction | Form 990 | $1,488,713FY2025 |
| Luvin ArmsErie | Form 990 | $1,480,134FY2024 |
| Trout UnlimitedDenver | Form 990 | $1,442,473FY2025 |
| SpaytodayLakewood | Form 990 | $1,419,334FY2024 |
| Animal Welfare and Protection SocietyPueblo | Form 990 | $1,329,941FY2025 |
| Peppers Senior Dog SanctuaryLittleton | Form 990 | $1,306,256FY2025 |
| Humane Society of Pagosa Springs IncPagosa Springs | Form 990 | $1,284,562FY2025 |
| Big Bones Canine Rescue ServiceWindsor | Form 990 | $1,240,870FY2025 |
| Evergreen Animal Protective LeagueEvergreen | Form 990 | $1,222,225FY2025 |
| Lifeline Pet RescueBrighton | Form 990 | $1,195,031FY2023 |
| Rocky Mountain Puppy RescueBerthoud | Form 990 | $1,186,131FY2025 |
| Amici Cannis USAFort Collins | Form 990 | $1,165,283FY2025 |
| Partners in Animal Protection and ConservationGolden | Form 990 | $1,144,777FY2024 |
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