Newcastle Post Office

9241 Old State Hwy, Newcastle, CA 95658

Contact Numbers

Phone: 916-663-9405
Fax: 916-663-9581
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 5:00pm
Tuesday 5:00pm
Wednesday 5:00pm
Thursday 5:00pm
Friday 5:00pm
Saturday 9:30am
Sunday Closed

Bulk Mail Acceptance Hours

Monday 9:00am - 11:00am, 12:00pm - 2:30pm
Tuesday 9:00am - 11:00am, 12:00pm - 2:30pm
Wednesday 9:00am - 11:00am, 12:00pm - 2:30pm
Thursday 9:00am - 11:00am, 12:00pm - 2:30pm
Friday 9:00am - 11:00am, 12:00pm - 2:30pm
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)
  • Money Orders (International)
  • 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:

2205 Rippey Rd
1.7 miles away

371 Nevada St
2.4 miles away

Downtown Auburn
100 Harrison Ave
2.9 miles away

3669 Taylor Rd
3.2 miles away


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First of all we just like to say I love the service and a small town feel of the New Castle Post office and my reason for actually calling is I don't want my package to get sent back. I don't have a car and I have trouble getting down there sometimes especially in this weather. Can you please please hold it for me until Monday and I will get it on Monday for sure. Thank you for anything you can do. Pamela Pena


I have not recieved acceptable service here. I have been waiting on a package that has been in sacaramento now for 3 weeks worth a good amount(I am able to track it)... i understand due to covid things are behind but i have recieved other packages and my family members have been ordering things also that go through that same location. They are not helpful and only pull up the SAME tracking report that I am able too, and tell me to keep waitong or to come back. Ive been there 3 timea now and nothi g is changed. My address on their website doesnt register (newer house) and no emplyees know how to help or offer. I am beyond frustrated with rhis post office.not to mention our neighbors revieve our mail all the time, and i have not recieved legal documents (many times) that i was notified were sent out. Dont trust them

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