From which source do many public-school districts receive the largest proportion of funding?

Public school districts typically receive the largest proportion of their funding from state government sources. This funding often comes from state income taxes, sales taxes, and various other state-controlled revenues. States allocate funding to local school districts based on their own funding formulas, which can consider factors like property tax revenues, student enrollment numbers, and specific student needs, such as those requiring additional resources for special education.

Federal government contributions, while important, generally account for a smaller percentage of overall school funding compared to state and local sources. City or local government funding, although significant in many districts, often does not surpass the state contributions. Various other sources, such as grants, donations, and fundraising, may supplement school budgets but are not typically the primary means of school financing. Thus, the predominant role of state government funding makes it the correct answer to which source provides the largest proportion for public school districts.