Comparison of U.S. state and territory governments

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In the United States, the government of each of the 50 states is structured in accordance with its individual constitution. In turn, each state constitution must be grounded in republican principles. Article IV, Section 4, Clause 1 of the United States Constitution tasks the federal government with assuring that each state's government is so organized.^[1]

All state governments are modeled after the federal government and consist of three branches (although the three-branch structure is not Constitutionally required): executive, legislative, and judicial.^[2][3] All state governments are also organized as presidential systems where the governor is both head of government and head of state (even though this too is not required). The government of each of the five permanently inhabited U.S. territories is modeled and organized in a like fashion.

Each state is itself a sovereign entity, and as such, reserves the right to organize in any way (within the above stated parameter) deemed appropriate by its people. As a result, while the governments of the various states share many similar features, they often vary greatly with regard to form and substance. No two state governments are identical. The following tables compare and contrast some of the features of U.S. state governments.