4 US states that border Mexico

Physical geography / By / June 18, 2026

The US-Mexico international land border is roughly 1,933 miles (3,110 km) long. There are 4 US states that border Mexico:

  1. California
  2. Arizona
  3. New Mexico
  4. Texas

US states that border Mexico

StateBorder length with MexicoBordering Mexican states
California140 milesBaja California
Arizona373 milesBaja California and Sonora
New Mexico180 milesSonora and Chihuahua
Texas1,241 milesChihuahua, Coahuila, Nuevo León, and Tamaulipas
States on the US-Mexico border
A map showing the states on the US-Mexico border

Texas shares the longest border with Mexico, stretching about 1,241 miles. California has the shortest border with Mexico (140 miles). While only four US states border Mexico, six Mexican states lie along the opposite side of the border. The six Mexican states that border the United States are:

  1. Baja California
  2. Sonora
  3. Chihuahua
  4. Coahuila
  5. Nuevo León
  6. Tamaulipas

Fun fact: The US-Mexico land border is the 10th longest international land border in the world.

​Frequently Asked Questions (FAQs)

Which US state shares the longest border with Mexico?

Texas shares the longest border with Mexico, stretching for about 1,241 miles (1,997 km). This accounts for more than 60% of the entire US-Mexico border.

Which US state shares the shortest border with Mexico?

California has the shortest border with Mexico, stretching about 140 miles (225 km) along the Mexican state of Baja California.

Is New Mexico a border state?

Yes, New Mexico is one of the four US-Mexico border states. It shares a 180 mile (290 km) boundary directly with the Mexican states of Sonora and Chihuahua.

Does Nevada or Colorado border Mexico?

No, neither Nevada nor Colorado borders Mexico. Only California, Arizona, New Mexico, and Texas share a direct land boundary with Mexico.

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