How many people have run the 800 meter under 2 minutes?

Answer 1

The number must be huge.

The National Federation of State High School Associations(NFHS), and
Track and Field News (T&FN) maintain lists of the outdoor national records
in the sport of Track and Field at the United States high school level.
According to those . . .

-- Michael Granville, of Bell Gardens CA High School, ran 800 meters in 1:46.45
at a high school meet in Norwalk, California, on May 31, 1996.

-- At the National Scholastic Championships in Greensboro NC on June 18, 2011,
the team from Long Beach CA Polytechnic High School ran the 4 x 800 meters relay
in 7:28.75, and each of the four runners in that race ran his individual 800 in under
2 minutes.

This doesn't even consider college or professional track.