- Hacienda Heights - Zip Codes in Hacienda Heights
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- Harbor City - Zip Codes in Harbor City
- Hawaiian Gardens - Zip Codes in Hawaiian Gardens
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- Homeland - Zip Codes in Homeland
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- Huntington Beach - Zip Codes in Huntington Beach
- Huntington Park - Zip Codes in Huntington Park
- Huron - Zip Codes in Huron
- Imperial - Zip Codes in Imperial
- Imperial Beach - Zip Codes in Imperial Beach
- Indio - Zip Codes in Indio
- Inglewood - Zip Codes in Inglewood
- Ione - Zip Codes in Ione
- Irvine - Zip Codes in Irvine
- Ivanhoe - Zip Codes in Ivanhoe