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

Bulk Mail Acceptance Hours

Monday-Friday 9:00am - 12:00pm, 1:00pm - 3:30pm
Saturday-Sunday Closed

Pickup Services Hours

Monday-Friday 8:30am - 5:00pm
Saturday 10:00am - 12:00pm
Sunday Closed

Lobby Hours

Monday-Sunday 12:01am - 11:59pm

PO Box Access Hours

Monday-Sunday 12:01am - 11:59pm

Last Collection Times

Monday-Saturday 5:30pm
Sunday Closed

Self-Service Kiosk Availability

Monday-Sunday 12:01am - 11:59pm

Carrier Facility Hours

Monday-Friday 8:30am - 5:00pm
Saturday 10:00am - 12:00pm
Sunday Closed

Global Express Guaranteed® Hours

Monday-Friday 8:30am - 5:00pm
Saturday 10:00am - 12:00pm
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
  • Global Express Guaranteed®
  • Money Orders (Domestic)
  • Money Orders (Inquiry)
  • Money Orders (International)
  • Pickup Accountable Mail
  • Pickup Hold Mail
  • PO Box Online
  • Priority Mail International®
  • Sure Money
  • Street Parking

Visit our Links Page for Change of Address, Hold Mail/Stop Delivery, PO Boxes™ rentals and fees, Rates on Postage Stamps and Freight/Shipping, Holidays, Bulk Mail, Money Orders, 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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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.

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