I recently created an interactive Covid-19 Hot Spots Dash App that provides both state-level and county-level heat maps of new infections per capita in the US.
It is hosted on Google Cloud Platform at https://covid19dashboard.app/. Source code at https://github.com/icanhazcodeplz/covid-data
Hopefully, it provides some useful data for you. Let me know what you think! Bug reports and feature requests are especially helpful :).
Initial View:
After clicking a state (or county):
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