Sources
HOLC polygons: Mapping Inequality, University of Richmond. The Jacksonville survey map is dated 1937; there is no separate 1939 Jacksonville map in that collection.
Adequacy: SFID District Cost Database 2026 (v6), ppcstot, predcost, fundinggap, latest year 2023.
Schools: NCES CCD 2024–25 directory and membership (v1a); locations from EDGE public school geocodes 2024–25. Race shares exclude adult education.
Income-to-poverty ratio: NCES EDGE School Neighborhood Poverty (SIDE) estimates, ACS 2018–2022, for 2021–22 schools, the newest release. Schools opened since then have no estimate and show as hollow dots.