Southern California

Zip Codes  90000-93931

Defined by San Diego for the southern border through San Luis Obispo for the northern border.  The California state lines define the eastern and western borders.  

Baja Norte, Mexico

Postal Codes  21xxx - 22xxx

North region of Mexico adjacent to the southern border of California

Arizona

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New Mexico

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Nevada

Zip Codes  89002 - 89193

Southern Nevada and Clark County