I believe it is Missouri.
Every state borders another except Alaska and Hawaii. Alaska does, however, border Canada; while Hawaii is an island. The continental state with the least borders is Maine, at one state, while the states with the most border states are Missouri and Tennessee, at eight states.
Tennessee and Missouri both border 8 states.
Alaska and Hawaii are the only two states that do not border other US states.
Alaska and Hawaii are the only two states that do not border other US states.
Alaska and Hawaii do not border any other state.
Missouri & Tennessee & indeed they border each other not just once but twice
Missouri and Tennessee.
Tennessee and Missouri
Tennessee and Missouri they border eight other states
Kentucky and Colorado are tied at the most with seven border states.
There are 32 U.S. states each of which shares a border with at least one other U.S. state AND does not share a border with any Mexican state or Canadian province. Of those 32, there are 18 U.S. states that do not border international waters either (i.e., do not border the Pacific Ocean, the Atlantic Ocean, or the Gulf of México).