POST OFFICE, DIAMOND BAR
1317 S. Diamond Bar Blvd.
Diamond Bar, CA 91765
909-860-2469  
HOURS
Mon-Fri:  9-5
Sat:        9-2
Sun:   Closed
Rates for ALL postal services.

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The largest sized box I found online was 15 x 12 x 12.  And that is a Priority Mail Regional Rate Box C.  If you go to your local PO, they will have larger boxes but they will probably need to be reworked or cut down to fit any item you'd like to ship.  If you want something a little closer to a custom fit, I'd recommend going to a Home Depot, Office Depot, or the alley behind the local Vons or Albertson's.


Diamond Bar Post Office #2
23441 Golden Springs Drive
Diamond Bar, CA 91765
800-275-8777 or 909-860-4900
HOURS
Mon-Fri:  9-5:30
Sat:        9-3:30 
Sun:       Closed 

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Diamond Bar Post Office #3
1142 S. Diamond Bar Blvd.
Diamond Bar, CA 91765
909-860-2401

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For post offices nearby Diamond Bar, CA