interstate vs. intrastate

interstate vs. intrastate: What’s the difference?

Interstate means “between states,” as in interstate trade between Ohio and Indiana. Intrastate means “within a state,” as in Ohio’s intrastate commerce. Interstate is also commonly used as a noun to refer to a highway that stretches between states (as opposed to only being within one). Remember, intra- means “within,” and inter- means “between” or “among.”