San Diego and Imperial are the only Californian counties bordering the country of Mexico.
San Diego County and Imperial County are the California counties that border Mexico.
The states that border Mexico are California, Arizona, New Mexico and Texas...
California borders Mexico.
Mexico cession
Nothing. California borders Mexico.
Zero. Mexico and California share a border.
Texas, California, New Mexico and Arizona all border Mexico.
California's southern border is shared with the country of Mexico.
Mexico
California was acquired from Mexico at the end of the Mexican-American War (1846-1848). Since then, southern California has been part of the US-Mexico Border.
Catron County on the Arizona border.
At the California/Mexico border it is a matter of inches.