Post Office

Customers that require package services, please contact customer service between the hours of 10:00 AM – 5:00 PM

Volunteers Needed

The times we need volunteers is from 5:00 AM – 9:00 PM from November through December for our holiday season.

Post Office Update

Postal Email Notifications.

Update your post office’s profile email address/es (you can add command sponsored dependents email) to get postal notifications. Postal notification could be about your package arrival/delivery and/or simply informational. Stop by our Customer Service window from Monday-Friday between 10:00 AM – 5:00 PM OR email us at to make changes to your profile. Do not block the AMPS email or you will not receive any notifications.

Going on Leave/TDY/Emergency Leave for over 1 week?

To avoid your mail from getting returned to sender after 15 days, you may fill-out a hold form or assign someone to pick up your mail for you while you’re away. Stop by our Customer Service window from Monday-Friday between 10:00 AM – 5:00 PM OR email us at with your Name, Box number, dates you want your mail to be held.

Remember to check your mail weekly and don’t hesitate to contact Osan Air Base Post Office for any questions. Thank you for your unrivaled support!

Mailing Services Window

Monday-Friday: 10:00 AM – 5:00 PM Saturday: 10:00 AM – 4:00 PM
Sunday: Closed

Official Mail Center

Monday-Friday: 8:30 AM – 4:00 PM
Saturday & Sunday: Closed

Registered Mail Center

Monday-Friday: 10:00 AM – 2:00 PM
Saturday & Sunday: Closed

Package Pick-Up Window

Monday-Friday: 10:00 AM – 6:00 PM
Saturday: 10:00 AM – 4:00 PM
Sunday: Closed

Customer Service Window

Monday-Friday: 10:00 AM – 5:00 PM
Saturday & Sunday: Closed

Your Address:
First & Last Name
PSC 3 Box ______
APO AP 96266

“Handwritten Customs Declaration Forms are No Longer Acceptable”

Customers are encouraged to use computer-generated customs forms, there will still be an option to fill out a customs information worksheet (USPS Form 2976-R), which will then be typed into the Retail System Software (RSS) by the Postal Finance Window Clerks.
Patrons must provide an accurate and complete description of the contents, names, and addresses. Customs information must be entered into an electronic system to ensure MPS compliance with USPS regulations and United States import and export laws. Currently these are the four methods patrons can utilize to obtain the appropriate Customs Declaration Form based on the destination country and mail class/ product selected:
USPS Click-N-Ship at:
USPS Customs Form Online (CFOL) at:
USPS partner systems (i.e.
PS Form 2976-R, Customs Declaration and Dispatch Note

NOTE: This new USPS policy will increase overall customer wait time and the current per-customer service time among other impacts. Thank you for your patience.

Unable to head to the Post Office to pick up your mail? Post office customers can designate trusted agents to pick up their mail by sending an email to with the following information: Customer’s name, Customer’s PSC Box Number, Authorized Agent’s Name, and the date range the Authorized Agent will be allowed to pick up mail on behalf of the customer (no more than 30 days).


Name: SSgt Jane Smith
Box Number: 1234
Authorized Agent: TSgt John Williams
Dates: 1 Jan – 29 Jan 22

After the customer sends the email, the Authorized Agent can report to the Post Office Customer Service window to finalize the process and pick up mail on the customer’s behalf.

Secure Your Address | Lock & Spin Your Dial

Claim your mail within five days of notice. Final notice comes five days after initial notice. After 10 days, units are contacted to verify status. If local, you have 24 hours to pick-up before item is returned to sender.

If you are TDY, on leave, or need mail held for another reason, please fill out DD Form-2258.

Click here to report a problem to the postal inspector (mail not received, mail tampering/vandalism, mail received without contents).

Do Not Mail

Hazardous, restricted, and perishable items are prohibited in the USPS mail stream. Below are examples of materials that cannot be sent. This is not an all-inclusive list. If in doubt, please inquire with staff.

  • Soju, intoxicating liquors, or any other alcohol
  • Corrosives
  • Explosives
  • Flammable/combustable
  • Liquids
  • Gases (pressurized)
  • Biological products
  • Controlled substances
  • Drug paraphernalia
    Firearms, switchblades, sharp objects, or any other weapons
  • Live, dead, or parts of animals
  • Eggs, meat, or meat products
  • Plants or plant products

Undeliverable items due to: Address unknown, addressee temporarily away, misspellings, address errors, missing/incorrect information, no rural route or box, incorrect ZIP code, change of address, forward order expired, address vacant