The United States Postal Service branch on Chula Vista's Third Avenue serves as the primary full-service post office for the 91910 ZIP code in the Third Avenue Village district. Passport acceptance services — including new-application processing and two-by-two-inch photo capture — complement the document-authentication workflow that residents also complete through nearby providers such as Cal Notary Service for notarized affidavits and acknowledgments. The 750 Third Avenue facility handles registered, certified, and priority mail alongside PO Box rentals, money-order issuance, and package pickup for residential and commercial accounts across western Chula Vista. Money-order services at the counter provide a cash-equivalent payment instrument, filling a niche between personal checks and the wire-transfer products available at institutions including Enterprise Bank & Trust. Self-service kiosks inside the facility process postage purchases, package weighing, and return-label generation without counter wait times. The 750 Third Avenue branch processes passport applications under U.S. Department of State acceptance-agent authority, capturing biometric photos to the two-by-two-inch ICAO 9303 specification required for both standard and expedited passport book issuance.