# Block Boundary Suggestion Project The **Block Boundary Suggestion Project** is the opening phase of the Census Bureau's decennial Redistricting Data Program, run under the authority of [[Public Law 94-171]]. It is the point at which a state may ask the Bureau to treat particular physical features as census block boundaries for the coming count — the Bureau's own examples are "non-standard features often used as electoral boundaries (such as power lines, property lines, or streams)." The phase matters more than its name suggests. Redistricting data is tabulated by whole blocks, so a line that is not a block boundary cannot become a district boundary. The project therefore sets the menu of edges every map drawn from the next census can follow. For the 2030 cycle the Bureau announced the phase by *Federal Register* notice on July 30, 2025, and state submissions closed on **May 29, 2026**; it has said it plans to provide state liaisons with updated materials in early 2027. What was accepted is not yet on the public record. > [!note] Stub > This is a short entry that hasn't been fully written yet. ## See also - [[Census Geography Tree]] — the 2030 geographic calendar, and why the bottom of the hierarchy was settled first - [[Census Block]] · [[Voting District]] · [[Public Law 94-171]] · [[Participant Statistical Areas Program]] - [[2030 Census]] · [[How a Redistricting Map Is Drawn and Challenged]]