Riverside Main Post Office

The Riverside Main Post Office at 4150 Chicago Avenue is the city's highest-capacity passport acceptance facility, offering both walk-in windows on weekday afternoons and a broader appointment grid than the downtown branch. Situated near the intersection of Chicago Avenue and Blaine Street in the University neighborhood, it draws applicants from the east side of Riverside, Moreno Valley, and the surrounding foothill communities.

This USPS facility handles DS-11 applications for new adult passports and child passports, with both parents or guardians required to be present for applicants under 16. The office processes a high volume of applications, so arriving early during walk-in hours (typically weekday midday windows) or securing an advance appointment through the USPS system is strongly advised.

Applicants should bring a completed and unsigned DS-11 form, original proof of U.S. citizenship, a valid photo ID, and two identical 2x2-inch passport photos. Payment is split between the U.S. Department of State fee (check or money order) and a separate USPS acceptance fee. For a broader view of all acceptance locations in the city, visit our Riverside passport offices page, and for statewide context, explore the California passport acceptance guide.

Walk-in slots fill quickly during the late-morning window; arriving before 10:15 AM weekdays gives you the best chance of being seen without an appointment. For guaranteed service, book via tools.usps.com or call the general USPS line. Do not sign your DS-11 beforehand—the acceptance agent must witness your signature. If your travel date is within 14 days, the Los Angeles Passport Agency at 11000 Wilshire Blvd, Westwood (~55 miles west on I-10) handles urgent cases by appointment only—plan roughly 1–1.5 hours of drive time each way from Riverside.