US–Mexico Border: Length and Border States

Length: 1,954 miles (3,145 km) — the world's most crossed international boundary.

Four US Border States (West to East)

1. California — 140 mi (225 km); crossings: San Ysidro (busiest land port in Western Hemisphere), Otay Mesa, Tecate, Calexico East/West.
2. Arizona — 372 mi (599 km); crossings: Nogales, Douglas, Naco, Lukeville, Sasabe, San Luis.
3. New Mexico — 180 mi (290 km); crossings: Columbus, Santa Teresa, Antelope Wells.
4. Texas — 1,254 mi (2,018 km) — longest stretch; crossings: El Paso (multiple), Laredo (4 bridges), Brownsville, Hidalgo, McAllen, Roma, Rio Grande City, Eagle Pass, Del Rio, Presidio.

Mexican Border States (6)

Baja California, Sonora, Chihuahua, Coahuila, Nuevo León, Tamaulipas.

Key Features

• Rio Grande (Río Bravo) forms 1,255 mi of the boundary (El Paso to Gulf).
• Colorado River forms 24 mi (AZ–Baja CA).
• Land border: fencing/barriers on ~700 mi; remainder natural terrain.
• ~350 million legal crossings/year (pre-pandemic); $1.7B+ daily trade.