Both Hawaii and Alaska do not share borders with any other states.
Hawaii
Russia
Hawaii
The US shares borders with two other states (countries) - Canada and Mexico
There is no Australian state which shares a border with all other states. No state except for Victoria shares a land border with Tasmania. South Australia shares a border with all mainland states and the Northern Territory.
Tennessee shares borders with 8 other states: Alabama, Arkansas, Georgia, Kentucky, Mississippi, Missouri, North Carolina, and Virginia.
Texas, Texas shares it's border with 4 states: New Mexico, Oklahoma, Arkansas, and Louisiana. California borders 3 states: Oregon, Nevada, and Arizona. Florida borders 2 states: Alabama and Georgia.
Missouri and Tennessee are the only states to border eight others.
Maine does not border at least 4 other states. It only shares borders with New Hampshire to the west.
Tennessee borders the most other U.S. states, with a total of eight neighboring states. It shares its borders with Kentucky, Virginia, North Carolina, Georgia, Alabama, Mississippi, Arkansas, and Missouri. This extensive connectivity makes Tennessee a significant geographical crossroads in the southeastern U.S.
Michigan shares a border with three states (Wisconsin, Indiana, and Ohio).In addition to these land borders, Michigan also shares water borders with the states of Illinois and Minnesota.Nebraska shares a border with 6 states (Colorado, Kansas, Missouri, Iowa, South Dakota, and Wyoming).As does Arkansas (Texas, Louisiana, Mississippi, Tennessee, Missouri, and Oklahoma).