From Bearing Arms:

Only a tiny fraction of U.S. counties account for nearly all of the country’s homicides, according to research released Tuesday that showed a striking concentration where killings take place.

The worst 31 counties — generally urban jurisdictions — have about a fifth of the country’s population but accounted for 42% of the country’s homicides in 2020, said John R. Lott Jr., president of the Crime Prevention Research Center, which conducted the study.