Roughly 1-2% of the world’s population has natural red hair, which translates to about 70 to 140 million people globally. The highest concentration of redheads is found in Ireland and Scotland, where about 10% or more of the population has red hair. The United States has the largest total number of redheads—estimated at up to 18 million—due to its large population, despite a lower percentage of redheads compared to Ireland and Scotland.