Measured by the average number of people who become sick from an infectious person, the site tracks the effective reproduction rate (Rt) of COVID-19 infections. If the value is less than one, the spread of the disease is slowing. The higher the Rt number, the worse the spread.
Editor’s note: This list contains ties and is based on data last updated June 21.
11 states with fastest spread of COVID-19
1. Hawaii — 1.60
2. Oregon — 1.46
3. Montana — 1.43
4. Florida — 1.39
5. Nevada — 1.37
6. Oklahoma — 1.32
7. Arizona — 1.28
8. South Carolina — 1.20
9. Alaska — 1.18
Missouri — 1.18
10. Idaho — 1.17
11 areas with slowest spread of COVID-19
1. Washington, D.C. — 0.68
2. Massachusetts — 0.69
3. Connecticut — 0.72
4. New Jersey — 0.75
Illinois — 0.75
5. Minnesota — 0.79
Rhode Island — 0.79
Virginia — 0.79
6. Maryland — 0.80
7. New York — 0.83
Pennsylvania — 0.83
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