States Bordering Arizona: Four US Neighbors + One Mexican State

Arizona's Geographic Neighbors

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

• North: Utah — Four Corners monument (only quadripoint in US).
• West: Nevada (Colorado River / Lake Mead) and California (Colorado River).
• East: New Mexico — Long surveyed meridian border.
• South: Sonora, Mexico — 372 mi (599 km) international border; crossings at Nogales, Douglas, Lukeville, San Luis, Sasabe.

Key Border Features

• Colorado River forms most of western border (with NV/CA) — critical water source.
• Four Corners (NE) — unique tourism draw.
• Border Wall/Fencing: ~300 mi of pedestrian/vehicle barriers (varies by sector).
• Ports of Entry: 6 major (Nogales-Mariposa busiest commercial), several minor.

Regional Context

Arizona is the 6th largest state (113,990 sq mi) and 14th most populous (7.4M). Phoenix metro anchors the "Sun Corridor" megaregion extending to Tucson and into Sonora.