States Bordering California

California's Three Land Neighbors

California shares land borders with three U.S. states:

• Oregon - to the north (border: ~330 km / 205 mi)
• Nevada - to the east (border: ~615 km / 382 mi)
• Arizona - to the southeast (border: ~390 km / 242 mi, defined by Colorado River)

International Border

Baja California, Mexico - to the south (border: ~240 km / 150 mi)

Maritime Boundaries

Pacific Ocean to the west. No other states touch California—it's a corner state of the contiguous U.S.

Border Crossing Context

Major crossings: I-5 (OR), US-395/I-80 (NV), I-40/I-15 (AZ), I-8/San Ysidro (MX - world's busiest land crossing).