A school district is the fixed administrative and regulatory body and is responsible for the management of education institutions within a territorial limit under its jurisdiction. A school district commonly is responsible for managing the money received, commonly from the superintending, superior governing body for the region. School districts are commonly responsible for the hiring of employees and the payment that can be effectively earned and withhold with the exception of the legal rights given by the superior regional body identified by the country or determinate state.

In the U.S., all states except Hawaii have their K–12 public schools function as units of local school districts. A school district usually operates several elementary, middle, and high schools. The largest urban and suburban districts operate hundreds of schools.^{[citation needed]} While practice varies significantly by state (and in some cases, within a state), most American school districts operate as independent local governmental units under a grant of authority and within geographic limits created by state law. The executive and legislative power over locally-controlled policies and operations of an independent school district are, in most cases, held by a school district's board of education. Depending on state law, members of a local board of education (often referred to informally as a school board) may be elected, appointed by a political office holder, serve ex officio, or a combination of any of these.^{[citation needed]}

An independent school district is a legally separate body corporate and political. Most school districts operate as independent local governmental units with exclusive authority over K–12 public educational operations and policies. The extent of their control is set by state-level law. Litigation against school districts is common and some law firms specialize in education law. Districts typically maintain professional liability insurance in order to pay its settlements and legal liabilities. As of 2023^[update] in most U.S. states, public school districts may lay taxes to fund their operations. In others, such as Maine, some school districts are able to lay taxes and others are not.

Independent school districts often exercise authority over a school system that is separate but similar to a town's or a county's powers. These include the power to enter contracts, use eminent domain, and to issue binding rules and regulations affecting school policies and operations. The power of school districts to tax and spend is generally more limited. For example, many school districts in New York state require a majority of voters living in the district or the local government to approval their annual budget, but school districts in Virginia have no taxing authority and must depend on another local government (county, city, or town) for funding.^{[citation needed]} A district's governing body, usually called a school board, is typically elected by direct popular vote but may be appointed by other governmental officials.^{[citation needed]} The governing body might also be known as a "board of trustees", "board of education", "school committee", etc.. This body usually appoints or hires an experienced public school administrator to function as the district's superintendent of schools – a district's chief executive. The superintendent oversees daily operations, decisions and implements the policies of the board. The school board may also exercise a quasi-judicial function in serious employee or student discipline matters.

School districts in the Midwest and West tend to cross municipal boundaries, while school districts in New England and the Mid-Atlantic regions tend to adhere to city, township, or county boundaries. As of 1951^[update] school districts were independent governmental units in 26 states, while in 17 states there were mixes of independent school districts and school districts subordinate to other local governments. In nine states there were only school districts subordinate to local governments.

In most Southern states, school systems operate either as an arm of county government or at least share coextensive boundaries with the state's counties. A 2010 study by economist William A. Fischel found that "two-thirds of medium-to-large American cities have boundaries that substantially overlap those of a single school district" with substantial regional and state variations in the degree of overlap, "ranging from nearly perfect congruence in New England, New Jersey, and Virginia, to hardly any in Illinois, Texas, and Florida." Florida school district governments have boundaries that parallel those of counties. According to Fischel, older and more populous municipalities "tend to have boundaries that closely match those of a single school district." Noting that most modern school districts were formed by consolidating one-room school districts in the first seven decades of the 20th century, Fischel argues that "outside the South, these consolidations were consented to by local voters" who "preferred districts whose boundaries conformed to their everyday interactions rather than formal units of government" and that "[t]he South ended up with county-based school districts because segregation imposed diseconomies of scale on district operations and required larger land-area districts."

In New York, most school districts are separate governmental units with the power to levy taxes and incur debt, except for the five cities with a population of over 125,000 (Buffalo, Rochester, Syracuse, Yonkers, and New York City), where the schools are operated directly by the municipalities.

The Hawaii State Department of Education functions as a single statewide school district, unique among states.