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Blood Types and the Population. O positive is the most common blood type. Not all ethnic groups have the same mix of these blood types. Hispanic people, for example, have a relatively high number of Oâs, while Asian people have a relatively high number of Bâs. The mix of the different blood types in the U.S. population is:
1 Type O Positive Donors: Approximately 84% of the U.S. population has Rh positive blood. This means that your RBCs can be given to 84% of those in need if their exact blood type is unavailable.  Type A Positive/Negative Donors: Your blood type is the second most common U.S. blood type.