The Answer: In the United States, 37% of the population has type O+ blood, making it the most common type. It's followed closely by A+, with 34%.Find out much more on our Blood Types page!âThe Editors.1  Calculator.2  Spelling Checker. 3  Place Finder. 4  Distance Calculator. 5  Periodic Table.n the United States, 37% of the population has type O+ blood, making it the most common type. It's followed closely by A+, with 34%. Find out much more on our Blood Types page! âThe Editors. 1  Calculator. 2  Spelling Checker. 3  Place Finder. 4  Distance Calculator. 5  Periodic Table.
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