Caldwell Post Office

823 Arthur St, Caldwell, ID 83605

Contact Numbers

Phone: 208-454-5560
Fax: 208-459-9304
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 5:30pm
Tuesday 5:30pm
Wednesday 5:30pm
Thursday 5:30pm
Friday 5:30pm
Saturday 5:30pm
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 Reply Mail Account Balance
  • Business Reply Mail New Permit
  • Duck Stamps
  • General Delivery
  • Money Orders (Domestic)
  • Money Orders (Inquiry)
  • Money Orders (International)
  • Pickup Accountable Mail
  • Pickup Hold Mail
  • PO Box Online
  • Sure Money
  • Passport Appointment Hours

Visit our Links Page for links to 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:

10 S Hawthorne Ave
3.1 miles away

16021 Pride Ln
4.5 miles away

Nampa Carrier Annex
820 Parkcentre Way
4.7 miles away

385 Fargo Ave
5.1 miles away


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My mail carrier is holding my mail I think, which is a good idea, as I've been in the hospital unexpectantly. I'm home now, and would like to have it delivered. My address is 5410 Lakewood Avenue, Caldwell, ID, 83606 Delores Potter


I have not received my mail for the past 2 months. We get spam mail but that's it. This is ridiculous. I got my insurance suspended cause I have not received my bill and other bills. Nor tax returns....this is inconvenience for us. Please fix this asap!


MANCHESTER DR AREA! We have been having an issue with our mail carrier for quiet sometime but now for the past few weeks or longer we haven't been getting our actual mail, we get those ads and that's it. Our Internet got shut off cause we hadn't gotten the bill then we realized we hadn't gotten ANY of our bills. This is ridiculous. And the snow isn't even an issue. I tried to call and talk to someone but the gentleman who answered the phone was so extremely rude. This needs to be fixed right away.


The mail carrier that delivers to S. Lake ave has not stopped since I put mail in my mailbox Thursday afternoon. I'm not sure why but I'm not getting mail and can't send any. This is ridiculous. The snow has been an inconvenience to everyone. Please do your job.


Mail carrier has been throwing our mail on the ground because we have a small pile of snowing making it so they would have to actually get out of their car to put the mail in the box. Mail carrier that drives on Lonkey Lane, please; do not throw our mail down. The 4 pieces I picked up yesterday were almost burried in the snow. Now I'm just wondering how many more pieces of mail were thrown on the ground due to weather that might inconvenience you to do the job you get paid to do. If you're too lazy to get out of your car, please have the post office call us in to get our mail so we don't find important paper work, and tax related items on the ground in the Spring.


I have multiple images of one mail truck that parks on the sida walk which also is a ramp for handicap individuals to gain access to the side walk. Has done this on several different days.

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