San Ysidro, CA

Located in southern San Diego County, ZIP code 92173 is predominantly home to the border city of San Ysidro. This area is most famously known for being the busiest land border crossing in the Western Hemisphere, connecting the United States with Mexico. Other landmarks include Las Americas Premium Outlets, a popular shopping destination, and the Tijuana River Estuary, a protected wetland area known for its diverse bird species.