Here are some relatively recent statistics on worldwide domestic cat populations:
Number of cats in the world: 200 million
Number of cats in the USA: 75 million
Number of cats in China: 46.8 million
Number of cats in Russia: 12.5 million
Number of cats in France: 8.7 million
Number of cats in Britain: 7.5 million
Number of cats in Italy: 7 million
Number of cats in Germany: 6.5 million
Number of cats in Poland: 5.4 million
Number of cats in Canada: 4.5 million
Number of cats in India: 3.9 million
Number of cats in Spain: 2.8 million
Number of cats in the Netherlands: 2.3 million
Ratios of Cats to People
Here are some cat-to-human ratios for a number of locations:
World – 1:34
Austria – 1:1
Europe, USA – 1:4
Canada, the Netherlands 1:7
Britain – 1:10
China – 1:28
India and Taiwan – 1:500
These statistics were obtained and/or extrapolated from Cats:500 Questions Answered by Dr. David Sands, various CIA publications containing population figures, and Statistics Canada.