The nation-based comma delimited relationship files contain a separate record for each unique entity code combination. For example, in the Congressional Districts and Counties file, if the county contains two congressional districts, there will be two records in the file for that county; one for each congressional district.
There are no tables for the single member states (Alaska, Delaware, Montana, North Dakota, South Dakota, Vermont, and Wyoming) or for the statistically equivalent areas of non-voting delegates (the District of Columbia, American Samoa, Guam, Puerto Rico, and the U.S. Virgin Islands).
These files contain only geographic reference codes; they do not include entity names. The codes are right justified and zero filled.
Note: For inter-censal changes to congressional districts, new tables are only generated for states with changes after the initial post-decennial redistricting. No new tables were generated for the 114th Congress, for example, because no states made changes to their 113th Congressional District boundaries.