This website has extremely informative visualizations that show how state and federal funding for school fills in those gaps: https://apps.urban.org/features/school-funding-do-poor-kids-...

Not really off-topic, IMO. The state department of education has it for state-level statistics in CO and NC. CO even publishes a browser in map form. Local school districts publish their own local budgets in these states, too.

That doesn't directly answer your question, but that's where I think you should start.