These Block Equivalency Files (BEFs) are the whole 2020 Census tabulation block representations of the 2024 State Legislative District plans as submitted by the states to the U.S. Census Bureau. Eleven states had changes to their state legislative districts since the 2022 elections. The .ZIP file contains a national block equivalency file and individual state files for just those eight states that had changes to both their state legislative districts - upper chamber and lower chamber plans (Georgia, Minnesota, Montana, North Carolina, North Dakota, Ohio, Washington, and Wisconsin) and those three states with changes only to their state legislative districts - lower chamber plans (Michigan, New York, and South Carolina). 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. The Census Bureau's maps and TIGER/Line shapefiles depict the correct location of the boundary (splits tabulation blocks).  A listing of those blocks split in the states' official plans is also provided.

Four states split blocks in their 2024 State Legislative District- Upper Chamber (SLDU) and State Legislative District- Lower Chamber (SLDL) plans: Colorado, Minnesota, North Dakota, and Washington. Additionally, Delaware split a block in their 2024 SLDU plan and Pennsylvania split a block in their 2024 SLDL plan.

These TIGER/Line products include the the 2024 State Legislative Districts, the 119th Congressional Districts, and other geography effective as of January 1, 2024. The congressional and state legislative district boundaries are the boundaries as submitted by the state liaisons in Phase 4 of the Redistricting Data Program and in effect for the 2024 election cycle.

If the boundary of a congressional or state legislative district split a 2020 Census tabulation block, the Census Bureau's annual TIGER/Line products will depict the correct location (showing the block split) of the boundary.

The geographic files for the 119th Congressional and 2024 State Legislative Districts are identified by their abbreviation within the file name: "cd119" for the 119th congressional districts; "sldu" for the state legislative districts - upper house; and "sldl" for the state legislative districts - lower house.

The State Legislative District (SLD) Reference Maps display the boundaries, names, and/or codes of SLDs in effect for the 2024 election cycle. Two separate map types make up this series: one that displays State Legislative Districts – Upper Chamber (SLDUs) and one that displays the State Legislative Districts – Lower Chamber (SLDLs). Each of these maps show the extent of the subject SLD, as well as the surrounding SLDs of the same type.