How Many Legal Medical Marijuana Patients Are There in the United States?

– 2.1 MILLION. Maine has the highest per capita medical marijuana patient population (38.42 per 1,000 people) with Michigan in second (27.06 patients per 1,000 people), and New Mexico in third (25.03 patients per 1,000) – all well above the national average of 10.79 per 1,000 people.