San Ysidro is a community within the city of San Diego, California. It was annexed by the city of San Diego in 1957. It is located in the southernmost part of San Diego County, California, immediately north of the international border with Mexico.

San Ysidro is named for San Ysidro Labrador (Saint Isidore), patron saint of farmers.

San Ysidro is home to the world's busiest land border crossing, where U.S. Interstate 5 crosses into Mexico at Tijuana. Each year over 14 million vehicles and 40 million people enter the U.S. at the San Ysidro port of entry. The great majority of these are workers (both of Mexican and US nationality) commuting from Tijuana to jobs in the greater San Diego area and throughout southern California. There is also a thriving reverse traffic, both of workers travelling to maquiladoras in Mexico and those purchasing services (vehicle repairs, hair and beauty services, childcare, medical and dental) or seeking entertainment in Tijuana. Crossing times are notoriously slow at San Ysidro, particularly for those entering the U.S. in cars. For this reason many cross on foot, the queue for which is frequently much faster than the vehicle line. Some foot travellers own a car in each country, and store them in one of the large parking lots located near the border post, or use the respective light rail systems of both cities (both systems have a station built solely to serve the border crossing point).

San Ysidro is also believed to be among the busiest sites for the importation of illegal drugs into the U.S. Much of this is smuggled in cars or trucks, but some is transported through one of the custom-built tunnels constructed by narcotraffikers under the border.

In 1984 a spree killing occurred at a McDonald's restaurant in the city, when James Huberty killed 21 people before himself being shot and killed by police officers.

External links

• San Ysidro Chamber of Commerce
• Catholic Forum's page on Saint Isadore