States Bordering Arizona

Arizona's Five Neighbors

Arizona shares borders with four U.S. states and one Mexican state:

• New Mexico — east (full border, 320 mi / 515 km)
• Utah — north (full border, 210 mi / 340 km)
• Nevada — northwest (Colorado River border, 30 mi / 48 km)
• California — west (Colorado River border, 160 mi / 260 km)
• Sonora, Mexico — south (international border, 370 mi / 595 km)

Geographic Notes

Four Corners Monument (NE Arizona) marks AZ/UT/CO/NM convergence—only quadripoint in U.S. Colorado River defines western/southern borders. Sonora border includes major crossings: Nogales, Douglas, Lukeville, San Luis, Sasabe.

Regional Context

Arizona sits at Southwest/Intermountain West transition. Borders reflect 1848 Treaty of Guadalupe Hidalgo (Mexico), 1853 Gadsden Purchase (southern AZ), 1863 Arizona Territory creation, 1912 statehood.