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The ASPCA endorses TNR as the only proven humane and effective method to manage community cat colonies
Source: American Society for the Prevention of Cruelty to Animals (2025)
American Society for the Prevention of Cruelty to Animals. (2025). ASPCA Position Statement. As cited in Cat Cognition. https://catcognition.com/statistics/feral-cats/#aspca-tnr-endorsement
99.4% reduction
A 16-year TNR program on the San Francisco Bay reduced the initial population of 175 cats by 99.4%, with only 1 cat remaining
PMC / Frontiers (2020)
30-40 million
The estimated number of community cats (strays and ferals) in the US is 30-40 million
HumanePro (Humane Society) (2025)
82% mean reduction
TNR in a Chicago neighborhood decreased colony populations by a mean of 82% from peak, with 8 of 20 colonies completely eliminated
Alley Cat Allies Research (2023)
95% sterilization rate
Córdoba, Spain achieved 95% sterilization rate of community cats through TNR from 2020-2024, projecting 55% population reduction by 2028
Alley Cat Allies (2025)
