OnTheMap for Emergency Management provides real-time access to a range of detailed Census Bureau data about the people living and working in areas affected by hurricanes, floods, wildfires, winter storms, and federal disaster declaration areas.
U.S. Census Bureau Data Tool: https://onthemap.ces.census.gov/em/
You can add filters to narrow down a search and then explore population data for the location/region impacted by events.
More details at: https://disaster.unl.edu