• Tri-State Region, the region around New York City
• Tri-state area, an area where three states (of United States) meet at one point
• Tri-state logic (electronic logic gate type)
• Tri-State University, a university in Angola, Indiana.
• Tri-State, an album by Above & Beyond
• Tri-state check box, specific graphical user interface element.
• Tri-State Tornado, the deadliest single tornado ever recorded in the United States
• Tri-State store, "Idaho's most interesting store", an outdoor supplier.

See also:

• tripoint