Google Map of Coronavirus cases: shows suspected cases, current cases, deaths, self-quarantines, etc. Updated regularly. It cites its sources for each placemark, linking to the relevant article or post that announces that infection case.
COVID 19 Data Visualizations
COVID-19 Dashboard - A lot of online maps use data from Johns Hopkins University, which also offers its own map. Out of all the “big circle” maps out there, the Johns Hopkins map seems to be the most precise — There’s also a mobile version for those of you tracking the virus from your phones. This version is embedded as a black column, above.
ncov2019.live: An alternative dashboard with more information about specific states, with filters. Updated often.
WorldoMeter - US Coronavirus numbers: This page shows only US cases including current active cases, recovered, and deaths. Provides graphs which clearly indicate exponential growth. Check out the numbers for other countries including:
University of Virginia Data Studio - World map of infections outside of China