Largest Southwestern U.S. State by Land Area

Arizona is the largest state in the U.S. Southwest by land area.

• Area: ~113,990 sq mi (295,234 km²)
• Rank nationally: 6th largest (after Alaska, Texas, California, Montana, New Mexico)

🗺️ Southwest Region Definition (Census Bureau)

• Arizona — 113,990 sq mi
• New Mexico — 121,590 sq mi (actually larger!)
• Oklahoma — 69,899 sq mi
• Texas — 268,596 sq mi (often considered separate "South Central")

⚠️ Important Correction

New Mexico (121,590 sq mi) is larger than Arizona (113,990 sq mi). The original statement was incorrect. If "Southwest" = AZ, NM, OK, TX → Texas #1, NM #2, AZ #3. If "Southwest" = Four Corners states (AZ, NM, UT, CO) → NM largest. Definitions vary.

Always clarify regional definitions when comparing state sizes.