Grossmont Post Office

5500 Grossmont Center Dr Ste 440, La Mesa, CA 91942

Contact Numbers

Phone: 619-460-4659
Fax: 619-460-2378
TTY: 877-889-2457
Toll-Free: 1-800-Ask-USPS® (275-8777)

Retail Hours

Lobby Hours
PO Box Access Available

Monday 24 hours
Tuesday 24 hours
Wednesday 24 hours
Thursday 24 hours
Friday 24 hours
Saturday 24 hours
Sunday 24 hours

Last Collection Times

Monday 5:15pm
Tuesday 5:15pm
Wednesday 5:15pm
Thursday 5:15pm
Friday 5:15pm
Saturday 3:30pm
Sunday Closed

*This facility does not process US Passports applications or renewals. Check nearby locations below.

  • Burial Flags
  • Business Line
  • Business Reply Mail Account Balance
  • Business Reply Mail New Permit
  • Duck Stamps
  • Money Orders (Domestic)
  • Money Orders (Inquiry)
  • Money Orders (International)
  • Pickup Accountable Mail
  • Pickup Hold Mail
  • PO Box Online
  • Sure Money
  • Street Parking

Visit our Links Page for Holiday Schedule, Change of Address, Hold Mail/Stop Delivery, PO Box rentals and fees, and Available Jobs.

*Please call to verify information. Is anything incorrect? Let us know here

Nearby Post Offices:

La Mesa Annex
6055 Lake Murray Blvd
0.5 mile away

La Mesa Finance
8064 Allison Ave
0.5 mile away

6519 Bisby Lake Ave
0.9 mile away

Lemon Grove
7938 Broadway
1.5 miles away


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This is a small post office. There are usually 2 clerks. Yesterday there was only 1. I got in line at 4:00, outside due to social distancing. It took 30 minutes before I reached the counter. There was only 1 clerk and she was slow, stopping in the middle of helping me to bring the rack of greeting cards to the back. The lobby was full and there were still 6 customers outside. At 4:40, I told them to go to the copy place down the hill because I was sure they wouldn’t get to the counter before closing. Covid-19 sucks and so did this location on November 16.

* is not a part of, or affiliated with, the official United States Postal Service (USPS).