These are the incidents currently loaded for the maps. They are public incident records, not a finding that someone committed a crime. The numbers are the rows loaded for the map. They are not a census of every report a city has published.
Chicago: See Chicago crime incidents on a map. Filter by type and date. The city's open data withholds about the last seven days. No account.
Milwaukee: See Milwaukee crime incidents on a map. These are live calls-for-service, and the default window is 24 hours. No account.
New York: See New York crime complaints on a map. The city publishes them after a quarter closes. No account.
Minneapolis: See Minneapolis crime incidents on a map. This page is Minneapolis, not all of Minnesota. Addresses are anonymized to the block. No account.
Denver: See Denver crime incidents on a map. Filter by type and date. Traffic stops are left out. No account.