Data.census.gov is the new platform to access data and digital content from the U.S. Census Bureau. It replaces the American FactFinder website, which was retired in 2020.
The earliest data on data.census.gov will be from the 2000 Census. American Community Survey (ACS) Data will not be available prior to 2010 with the exception of the 2009 Comparison Profiles. All ACS data, including 2005 to 2009 data, are available in the Census Data API.
For detailed information about the new platform see this guide