As the novel coronavirus sweeps across the United States, it appears to be infecting and killing black Americans at a disproportionately high rate, according to a Washington Post analysis of early data from jurisdictions across the country.

The emerging stark racial disparity led the surgeon general Tuesday to acknowledge in personal terms the increased risk for African Americans amid growing demands that public-health officials release more data on the race of those who are sick, hospitalized and dying of a contagion that has killed more than 12,000 people in the United States.

A Post analysis of available data and census demographics shows that counties that are majority-black have three times the rate of infections and almost six times the rate of deaths as counties where white residents are in the majority.

In Milwaukee County, home to Wisconsin’s largest city, African Americans account for about 70 percent of the dead but just 26 percent of the population. The disparity is similar in Louisiana, where 70 percent of the people who have died were black, although African Americans make up just 32 percent of the state’s population.

In Michigan, where the state’s 845 reported deaths outrank all but New York’s and New Jersey’s, African Americans account for 33 percent of cases and roughly 40 percent of deaths, despite comprising only 14 percent of the population. The state does not offer a breakdown of race by county or city, but more than a quarter of deaths occurred in Detroit, where African Americans make up 79 percent of the population.

And in Illinois, a disparity nearly identical to Michigan’s exists at the state level, but the picture becomes far starker when looking at data just from Chicago, where black residents have died at a rate six times that of white residents. Of the city’s 118 reported deaths, nearly 70 percent were black — a share 40 points greater than the percentage of African Americans living in Chicago.