Clearlake Oaks Post Office

13280 E Highway 20, Clearlake Oaks, CA 95423

Contact Numbers

Phone: 707-998-3544
Fax: 707-998-3544
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 3:30pm
Tuesday 3:30pm
Wednesday 3:30pm
Thursday 3:30pm
Friday 3:30pm
Saturday 9:00am
Sunday Closed

Bulk Mail Acceptance Hours

Monday 8:30am - 3:00pm
Tuesday 8:30am - 3:00pm
Wednesday 8:30am - 3:00pm
Thursday 8:30am - 3:00pm
Friday 8:30am - 3:00pm
Saturday Closed
Sunday Closed

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

  • Bulk Mail Acceptance
  • Bulk Mail Account Balance
  • Bulk Mail New Permit
  • Burial Flags
  • Business Line
  • Business Reply Mail Account Balance
  • Business Reply Mail New Permit
  • Duck Stamps
  • General Delivery
  • Money Orders (Domestic)
  • Money Orders (Inquiry)
  • Pickup Accountable Mail
  • Pickup Hold Mail
  • PO Box Online
  • Sure Money
  • Lot 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:

Clearlake Park
13417 Lakeshore Dr
2.4 miles away

14500 Olympic Dr
2.7 miles away

9530 Highway 20
2.8 miles away

Lower Lake
16165 Main St
5.1 miles away


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I have nothing but good things to say about my Clearlake Oaks Post Office . My carrier, Kelly is wonderful and the people who work behind the desk at the post office are very kind and helpful. The fastest way for me to get a package is almost always through USPS.


So at clearlake Oaks post office you have to take off work for a day to pickup a package unless it comes from Planet Bezos! Right?


How much does a po box cost.


Why does the location have staff there on Saturday but they won't open the retail area, guess that's why the USPS loses money every year


I run a mail order/eBay business out of Clearlake Oaks called Small Military Models. Everything I do involves packages and I have been involved in mail related services for most of my adult life. I have dealt with the best and the worst including San Francisco, Rohnert Park, Cotati, Santa Rosa and Cloverdale post offices + every major package service as well. I have nothing but praise for these guys, from Tanya who picks up my packages most days to Sandy who "hunts down" the tough packages for me to everyone in between. These guys have always treated me with professionalism as well as with a rather pleasant manner. Even my dogs look forward to seeing them! If you are new to the area, prepare to be spoiled by our first class postal employees. Thanks guys! Michael Tobener


Mike. Where are you?
• Replied to Michael Tobener


I have had nothing but surliness from my carrier in Clearlake Oaks, CA 95423. Her name is Kelly and she is unwilling to bring packages to our homes. My road is less than 1/4 block long, there are four houses all bunched together. She will leave our packages on top of the mailbox row if they can't be crammed inside. My neighbors and I have all had items stolen by kids who walk along the main road to our development, I'm tired of it.

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