When you look at a data table, you need to know what area those data represent. Sometimes it's not obvious!
Before gathering data, you might need to look at a map to see what area(s) or Geographies you want to analyze. You can do that using Social Explorer or data.census.gov (linked below).
Most of us are familiar with the geographic entities Nation (whole United States), State, and County.
It gets trickier when you want statistics on a smaller area, like "Richmond, VA." Some common Census Geographies we might look at data for:
There are lots of other geographies too, like Congressional Districts, School Districts, Blocks, Block Groups, and more.
(These maps were all generated using Social Explorer:)
The boundaries of certain Census areas change over time. If you are doing research that compares data over time at areas smaller than Counties, these sources can help you do that effectively.