Alabama , Alaska , Idaho , Maine , Mississippi , West Virginia , and Wyoming remain free of coronavirus cases .
Confirmed cases had appeared in 41 out of the 50 U.S. states , and Washington , D.C. On January 31 , 2020 , the U.S. government began to require Americans returning home after traveling in China 's Hubei Province to submit to a 14-day quarantine .
2020 coronavirus pandemic in the United States