48 states
48 states are part of the contiguous United States. Alaska and Hawaii do not touch any other U.S. state.
48 states touch at least one other state. Some states of the 48 touch at least 3 other states. Only Alaska and Hawaii don't touch another state.
Alaska and Hawaii do not border any other state.
The border of a state or province has to touch something. If you are referring to the United States, only Hawaii does not border any other sovereign land - but it does touch the Pacific Ocean.
Utah
2 states do not touch each other out of the 50 states. Those states are Alaska and Hawaii
Hawaii is an island state that does not touch any other states.
Every state in the Unites states touch at least one other state except Hawaii and Alaska, so the total is 48 states.
Contiguous United States
48 states touch at least one other state; all but Alaska and Hawaii.
In the United States, 48 states touch at least one other state. The only exceptions are Alaska and Hawaii; Alaska is separated from the contiguous U.S. and only shares a border with Canada, while Hawaii is an isolated island chain in the Pacific Ocean.