Oregon.
One would think that California, Washington and Alaska would too. But, Alaska borders the Bering Sea not the Pacific Ocean. And California and Washington both have borders that snake back and border smaller inlets.
The entire western boundary of Kansas is included in the border of Colorado.
Argentina
The US states of Alaska, California, Oregon and Washington share their western border with the Pacific Ocean. Also, the US state of Hawaii is located in the Pacific Ocean and it shares all its borders with the Pacific Ocean.
Portugal shares Spain's western border.
Wisconsin shares its entire eastern border with Lake Michigan.
Sacramento. That is the capital of California which has the longest border with Nevada. Nevada's entire western border is with California.
The territory that shares its western border with the Northwest Territories is Yukon. It is located to the west of the Northwest Territories.
None.Hawaii shares no borders with other States.
The US states of Alaska, California, Oregon and Washington share their western border with the Pacific Ocean. Also, the US state of Hawaii is located in the Pacific Ocean and it shares all its borders with the Pacific Ocean.
Ecuador and Panama
Yukon Territory
Oklahoma