Brand Certified
United States Postal Service
2.5(233 reviews)
Certified by United States Postal Service • Aug 16, 2026
Business Details
420 N Twin Oaks Valley Rd, San Marcos, CA
92069, United States
Certified by United States Postal Service • Aug 16, 2026
(800) 275-8777
Certified by United States Postal Service • Aug 16, 2026
http://usps.com/postoffice
Certified by United States Postal Service • Aug 16, 2026
About
Certified by United States Postal Service • Aug 16, 2026
Post OfficeShipping ServiceCargo ServicePackaging Supply StoreLogistics ServiceMoney Order ServiceVisa and Passport OfficeUnited States Postal Service
Visit your local Post Office™ at 420 N Twin Oaks Valley Rd to find everything you need to send mail and ship packages. Explore our other products and services like money orders, Post Office™ boxes, passports, gift cards, and more
Location
Certified by United States Postal Service • Aug 16, 2026
United States Postal Service
420 N Twin Oaks Valley Rd, San Marcos, CA
92069, United States
Hours
Certified by United States Postal Service • Aug 16, 2026
Monday9:00 AM - 5:00 PM
Tuesday9:00 AM - 5:00 PM
Wednesday9:00 AM - 5:00 PM
Thursday9:00 AM - 5:00 PM
Friday9:00 AM - 5:00 PM
Saturday10:00 AM - 4:00 PM
SundayClosed
Products & Services
1 list · 35 items
Explore offerings from United States Postal Service on 420 N Twin Oaks Valley Rd in San Marcos, with popular services available at this location.
Reviews
2.5
233 reviews
5 stars
72
4 stars
8
3 stars
11
2 stars
13
1 star
129
- KJKatelynn Jones1 day ago1.0They do not offer Passport Walk-in services. Website needs so be changed to address this, neither does the post in Vista. I called several times before hand to confirm at both locations if they take walk ins but not one of my calls were taken.
- LMLaura MoralesJul 27, 20261.0We are extremely disappointed with our experience here, we would give it 0 starts if we could. We had a passport appointment on Saturday and they called us an hour before the appointment to let us know that they had to cancel because the person called in “sick.” They rescheduled us for 5 pm today and told us they would let the staff know we were coming in and to keep it open. When we walked in we were rudely told the post office was closed and got the door shut on us. We explained our situation and were told that they never do appointments that late and that their system was already shut down. When we asked what we could do, they advised us to schedule elsewhere because their Saturday passport clerk was actually on vacation. Don’t go here if you need a passport in a timely manner.
- TFTC FreebirdJul 20, 20265.0Now all I know there were people online who weren’t too happy about standing in a line, they have to take a consideration that we all came in at the end of the day when we all got off of work. The people working at this postservice are doing the best they can as quickly and officially as they could, and I commend them for doing a great job. I know working with the Publix and not the easiest thing to do, but they did it and they did it well and I went to clerk number four on July 13, 2026 at 4:45 PM. And she helped me send out an envelope to Chowchilla California. I’d like to command all the workers at the United States Postal Service office at 420 North Twin Oaks Valley Road. you may not have the hardest job in the world, but it’s certainly not the easiest either. And you work with the public quite well. I commend you and I appreciate you. You make my world a better place. Thank you very much.
- EBErin BettencourtJul 13, 20261.0With all the people currently looking for a job, why employ Eva? Fire her. I have never met a more rude and unhelpful person in my life. The treatment I received for simply wanting to mail a box was astonishing. I have no words. She’s awful and needs to be fired.
- DGDave GJul 6, 20261.0Walk in passport services not available, not updated on The website rather with a sign on the door ! So I drag my child out of bed to get in line for nothing ... shame on you!
Frequently Asked Questions About United States Postal Service
Can I get a passport application at this Post Office?
Yes, Thousands of Post Offices™ accept first-time passport applications for the U.S. Department of State. Most of those locations can also take your passport photo. Please complete and print your passport application form before you apply.
Is an appointment needed for passport services?
Most Post Offices that offer passport services have set hours, and you'll need to schedule an appointment using our online scheduler. We also offer limited Passport walk-in hours at select locations.
Does this location take the photo needed for passports?
For first-time passport and photo services, please make an appointment using our online scheduler.
What is the cost to take a passport photo?
The current fee for a passport photo at USPS is $15.
When does this location do walk-in passports?
We offer limited Passport walk-in hours at select locations.
Can I get a PO Box online?
Yes, you can search for available PO Boxes and reserve one online at https://www.usps.com/manage/po-boxes.htm. The process is quick and secure, and you'll receive instructions for completing your setup in person.
How much is a small PO Box?
PO Box prices vary by location. You can check exact pricing for your area by visiting https://www.usps.com/manage/po-boxes.htm and entering your ZIP Code.
Can you get to the PO Boxes in the lobby after hours?
Most USPS locations offer 24/7 access to PO Boxes in the lobby. Access hours may vary by location, so check with your local Post Office for specific lobby hours.
How can I get a PO Box?
You can apply for a PO Box online or in person at your local Post Office. Just bring two valid forms of ID and your completed application if applying in person. To start online, visit https://www.usps.com/manage/po-boxes.htm.
What time can I check my PO Box weekly and on weekends?
You can check your PO Box during lobby hours, which often include extended hours or 24/7 access. Weekend access may vary. Check with your local Post Office for exact times.
What services can I find at the United States Postal Service located at 420 N Twin Oaks Valley Rd?
You can send mail, ship packages, purchase money orders, rent Post Office™ boxes, apply for passports, buy gift cards, and more at this location.
Can I apply for a U.S. passport at this Post Office?
Yes, this Post Office accepts first-time passport applications and can take passport photos with an appointment.
Do I need an appointment to use passport services at this location?
Most passport services require an appointment using the online scheduler, although limited walk-in hours are available at select locations.
What are the operating hours of the United States Postal Service in San Marcos, CA?
The Post Office is open Monday to Friday from 9:00 AM to 5:00 PM, Saturday from 10:00 AM to 4:00 PM, and closed on Sundays.
How can I reserve a PO Box at this Post Office?
You can search and reserve a PO Box online, then complete your setup in person at the Post Office with two valid forms of ID.
Is there 24/7 access to PO Boxes at the San Marcos Post Office?
Most USPS locations offer 24/7 PO Box lobby access, but hours may vary. Check with your local Post Office for details.
Where is the nearest convenience store to the United States Postal Service at 420 N Twin Oaks Valley Rd?
7-Eleven, a convenience store, gas station, and liquor store, is located nearby, providing quick access for snacks or fuel before or after your visit to the Post Office.
Are there any local dining options near the United States Postal Service in San Marcos?
Yes, Papa Johns Pizza, a fast food and pizza restaurant, is nearby if you want to grab a meal before or after visiting the Post Office.
Can I visit a park near the United States Postal Service in San Marcos?
Richmar Park is located close to the Post Office and offers outdoor activities you might enjoy before or after your postal visit.
Brand Certified Facts from United States Postal Service
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