Redheads make up about 1% to 2% of the world’s population. This means there are approximately 70 to 140 million redheads worldwide. Although the United States does not have the highest percentage of redheads, 2 to 6%, compared to Scotland with 10 to 15%, it has the highest number of people with red hair, because of the size of its population. If the above percentages are used, there would be 6 to 18 million redheads in the US.