San Ysidro, CA

ZIP code 92173 is situated in the southernmost part of San Diego County, California. This area is known for being home to the San Ysidro Port of Entry, the busiest land border crossing in the Western Hemisphere. Other important landmarks in 92173 include the Las Americas Premium Outlets, a popular shopping destination, and the Tijuana River Estuary, a protected wildlife refuge along the border.