S.B. No. 4 proposes a comprehensive redefinition of the electoral districts for the election of members of the United States House of Representatives from Texas. The bill meticulously outlines the specific counties and tracts that comprise each district, ensuring clarity in the geographic boundaries for Districts 1 through 38. For example, District 1 includes counties such as Cass and Bowie, while District 2 is primarily made up of tracts within Harris County. The bill emphasizes the importance of accurately delineating these districts to reflect population changes and ensure fair representation, providing a detailed enumeration of tracts and blocks for each district.

Additionally, the bill establishes definitions for key terms such as "tract," "block group," and "block," referencing the 2020 Census TIGER/Line Shapefiles as the basis for these geographic areas. It also includes a provision to correct any erroneously omitted geographic areas in the appropriate district, guided by judicial precedent from the case of Smith v. Patterson. Importantly, the bill repeals all previous enactments related to congressional districts in Texas, including a specific act from the 87th Legislature, and states that the new districts will be applicable for elections starting in 2026. The bill is set to take effect immediately upon receiving a two-thirds vote from both houses or 91 days after the legislative session if that threshold is not met.