U.S. Blood-type Distribution
O+
38 percent of population
A+
34 percent of population
B+
9 percent of population
O-
7 percent of population
A-
6 percent of population
AB+
3 percent of population
B-
2 percent of population
AB-
1 percent of population
ABO and Rh blood type distribution by nation (averages for each population) Country O+ A+ B+ AB+ O− A− B− AB−
Austria[13] 30% 33% 12% 6% 7% 8% 3% 1%
Australia[14] 40% 31% 8% 2% 9% 7% 2% 1%
Belgium[15] 38.1% 34% 8.5% 4.1% 7% 6% 1.5% 0.8%
Canada[16] 39% 36% 7.6% 2.5% 7% 7% 1.4% 0.5%
Denmark[17] 35% 37% 8% 4% 6% 7% 2% 1%
Finland[18] 27% 38% 15% 7% 4% 6% 2% 1%
France[19] 36% 37% 9% 3% 6% 7% 1% 1%
Germany[20] 35% 37% 9% 4% 6% 6% 2% 1%
Hong Kong, China[21] 40% 26% 27% 7% <0.3% <0.3% <0.3% <0.3%
Ireland[22] 47% 26% 9% 2% 8% 5% 2% 1%
Korea, South[23] 27.4% 34.4% 26.8% 11.2% 0.1% 0.1% 0.1% 0.05%
Netherlands[24] 39.5% 35% 6.7% 2.5% 7.5% 7% 1.3% 0.5%
New Zealand[25] 38% 32% 9% 3% 9% 6% 2% 1%
Poland[26] 31% 32% 15% 7% 6% 6% 2% 1%
Sweden[27] 32% 37% 10% 5% 6% 7% 2% 1%
UK[28] 37% 35% 8% 3% 7% 7% 2% 1%
USA[29] 37.4% 35.7% 8.5% 3.4% 6.6% 6.3% 1.5% 0.6%
http://health.howstuffworks.com/question593.htm
http://www.bloodbook.com/world-abo.html