The standard hierarchy of census geographic entities displays the relationships between legal, administrative, and statistical boundaries maintained by the U.S. Census Bureau. The hierarchy provides a quick and easy way to see how the different geographic entities at the Census Bureau relate to one another. In other words, it shows how different geographic areas may, or may not, be related. It depicts relationships with a line and shows where relationships do not exist by displaying entities on different line tracts.
Standard Hierarchy of Census Geographic Entities
This diagram shows how levels of geography relate from the National level down to Census Blocks.
Hierarchy of American Indian, Alaska Native, and Native Hawaiian Areas
This diagram shows American Indian, Alaska Native, and Native Hawaiian Areas relate starting at the block level.