These Block Equivalency Files (BEFs) are the whole 2020 Census tabulation block representations of the 118th Congressional District plans as submitted by the states to the U.S. Census Bureau. The .ZIP file contains a national block equivalency file and individual state files for all states, the District of Columbia, and Puerto Rico. The fields in these files should be imported as text to preserve leading zeros.

In instances where plans included split 2020 Census tabulation blocks, the Census Bureau requested that the state assign the whole block to one district for the purpose of tabulating data. These block equivalency files contain the whole block tabulation plan.

Only one state--Colorado--split blocks in their 118th Congressional District plan. Colorado split one block, 080010096072000, between Congressional District 07 and Congressional District 08. The data for that census block will be tabulated to Congressional District 08.

- Congressional districts are identified by a 2‐character numeric FIPS code. Congressional districts are numbered uniquely within state. The District of Columbia and Puerto Rico have the code of 98, which identifies their status with respect to representation in Congress:

• 01 to 53—Congressional district codes
• 00—At large (single district for state)
• 98—Nonvoting delegate

- In Connecticut, Illinois, and New Hampshire the state did not assign the current (118th) congressional districts to cover all of the state or equivalent area. The code “ZZ” has been assigned to areas with no congressional district defined (usually large water bodies). These unassigned areas are treated within state as a single congressional district for purposes of data presentation.