From Off Campus
Small Geographic Areas
- The smallest geographic areas that the Census Bureau collects data for are: Census Tracts, Block Groups, and Blocks. These areas are only covered in the decennial censuses. The Census Bureau and the Department of Agriculture also collect data at the ZIP Code level.
- Census Tracts and Block Numbering Areas (Census Bureau)
- ZIP Code Statistics (Census Bureau)
- Geographic Names Information System (GNIS) (U.S. Geological Survey)
Easy way to identify geographic “features.” Includes state and county in which the feature is located. Links to sites offering map viewers for graphical display of the feature; includes population in 2000.
- Zip + 4 Code Look-up (U.S. Postal Service)
- How Far Is It?
Useful for locating streets and features. Note: Census outline maps do not contain much detail.
- Tom Nunamaker's Census Age Calculator
The Decennial Census
The federal census has been taken every 10 years (decennially) since 1790. The taking of the census is established in Article 1, Section 2 of the United States Constitution.
The Census Bureau reports data for a wide variety of geographic types, ranging from the entire United States down to a Census Block. Some geographic types follow recognized boundaries, such as counties and cities. Others are created by the Census Bureau.
Geographic Terms and Concepts (Census Bureau)
The diagram shows the many geographic types for which data are available. In general, larger geographic types (e.g., state) are shown near the top and smaller geographic types (e.g., census tract) are shown towards the bottom.
Census Geography help in American FactFinder.
Associate Librarian, Reference and Instructional Services Department,
Reference and Instructional Services Department, Room 117H
University of Delaware Library
181 S. College Ave.
Newark, DE 19717-5267
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