The four western states in the United States of America are Utah, CALIFORNIA, IDAHO, and Montana. Utah is a four letter state located in the western region of the United States. It is bordered by Colorado to the east, Wyoming to the northeast, IDAHO to the north, Arizona to the south, and Nevada to the west. CALIFORNIA is a ten letter state located in the western region of the United States. It is bordered by Oregon to the north, Nevada and Arizona to the east, and Mexico to the south. IDAHO is a five letter state located in the northwestern region of the United States. It is bordered by Montana to the northeast, Wyoming to the east, Nevada and Utah to the south, and Washington and Oregon to the west. Montana is a seven letter state located in the northwestern region of the United States. It is bordered by North Dakota and South Dakota to the east, Wyoming to the south, IDAHO to the west, and the Canadian provinces of British Columbia, Alberta, and Saskatchewan to the north.