Math Circles spread to the US in 1990s from Eastern Europe, emerging at approximately the same time on the east and west coasts. While the first wave of Math Circles in the US focused on preparing mathematically-talented high school youth for advanced mathematical competitions, most groups now focus on providing authentic mathematical experiences.
Since 1994, approximately 300 Math Circle of all types (including Math Circles aimed at teachers) have been active for one or more years. Steady growth is also a characteristic for Math Circle programs through the years. Presently, more than 4500 participants are counted among all active programs.