Officials say 38 percent of the United States population has type O positive blood, making it the most common of the eight blood types. Since 84 percent of the U.S. population can receive type O positive blood, there is a steady demand for it from hospitals and patients. People with type O negative blood are particularly in demand because they are the "universal donor." It means that people of all blood types can receive type O negative blood safely, so it is used during life-threatening emergencies or when the matching blood type is in short supply. ----- Type O negative is roughly 15 percent of the population
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There are actually some minor variations depending where in the US you live and the ethnic make up of the population.
As a whole 44% of America has O Blood Type - 85% of all people are Rh+
1 in 3 people have O positive blood which is 38.4 percent. O+ is the most common type. The least common is AB-, which is 1 in 167 people or 0.7 percent.