Code and derived data for the preprint "Childhood Lead-Exposure Prevention Through Predictive Mapping of At-Risk Housing Nationwide: A Free, Public-Data Screening Map Checked Against Measured Blood Lead in Eleven States" (Ritter, 2026). The map scores childhood lead-exposure risk for all 83,388 U.S. census tracts and 3,222 counties and county-equivalents from public U.S. Census American Community Survey data (housing age and poverty), a Washington State Department of Health-style housing-age-plus-poverty index anchored to the EPA hotspots analysis of Zartarian et al. (2024), and is checked against measured childhood blood lead in eleven states (Spearman rho 0.43 to 0.77). Independent tests, on surveillance the source study never used, are Wisconsin, Massachusetts, Rhode Island, and Minnesota at the tract scale and New Jersey, Illinois, Iowa, Missouri, and New York at the county scale; Michigan and Ohio reuse the source study's own surveillance and are consistency checks, not independent tests. Includes the analysis code, the derived tract- and county-level risk scores, and the per-state predicted-versus-measured validation joins. All inputs are public; no individual-level or identifiable data are included.