Washington borders the Canadian province of British Columbia.
The Canadian province of British Columbia borders Washington to the north.
BC
Alberta
Vermont does.
Canadian province British Columbia is directly north of USA's Washington state. It is the western-most Canadian province.
Idaho borders both Washington and Oregon on their eastern borders. Oregon is bordered on the south by California and Nevada. In additon, Washington is bordered on the north by the Canadian province of British Columbia and Washington and Oregon are both bordered on the west by the Pacific Ocean.
BC borders only two US states-- Alaska and Washington State.
to the north of Washington state is the Canadian province of british Columbia & you could also just say Canada or the Canadian border borders Washington state in the north yet the state of Oregon might also be said to border Washington state in the north in the sense of to its own north to the north of Oregon & it is a peculiarity of English that one cant be positively sure which of these two meanings you have in mind moreover it is a peculiarity of geography that regardless of which way you mean the question the state of Idaho also borders Washington state in the north in a few places due to the sinuosities of the snake river
Oregon and Idaho are the two states that border Washington state.
Alaska borders on the Canadian province of British Columbia and the Canadian territory of Yukon.
British Columbia