Plainsboro Post Office

12 Schalks Crossing Rd, Plainsboro, NJ 08536

Contact Numbers

Phone: 609-799-0239
Fax: 609-936-8935
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 3:00pm
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
  • General Delivery
  • Money Orders (Domestic)
  • Money Orders (Inquiry)
  • Money Orders (International)
  • Pickup Accountable Mail
  • Pickup Hold Mail
  • PO Box Online
  • 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:

4599 Route 27
1.8 miles away

Princeton Junction
331 N Post Rd
2.0 miles away

Po Box Locker
2.2 miles away

Palmer Square New
259 Nassau St Ste 2
2.4 miles away


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Applying for job online. Every time I try to create an account before logging in I'm not able to. My password deletes and email don't go through. This makes no sense because I'm not able to even apply for the position and not able to create an account. This is aggravated.


So here's my story: I moved into the Crossings Apartments on Fox Run Drive May 31st, 2022. I went that very same day to this post office to pick up my mailbox key. I was told it would take 7-10 days for them to change the lock on the mailbox to match my key. Ok - that's disappointing but I said I could live with it. Well, now after 16 days the d*mn lock still hasn't been changed and I still can't get my mail. I find the staff at this post office to be pleasant and helpful, but come on - this is PISS-POOR service! Well, all I can say is what do you expect from the U.S. Government which does absolutely NOTHING with excellence or quality.


I have lived in Plainsboro for over 40 years and have never had a problem with this post office. The staff is always courteous, helpful, efficient and friendly. Thank you for your assistance for over 40 years.


You lost another package of mine!! This is unacceptable and it seems that it's always the same employee who makes these mistakes. Frankly, I am shocked this person hasn't been fired yet.


How does a post office not answer their phone. They had my sons package yesterday and sent it back to trenton this am. I feel real sorry for people that deal with this post office. I've called 6 times only to be picked up by an answering machine


My name is Eric Dinkelacker and I live in 3902 Ravens Crest Drive in Plainsboro And I did have any mail for about a week I think my mail is at the Post Office or being destroyed. Please call [number removed] or 732-754-9536 Thank you


Mail man has not delivered mail to my home in 2 days. He has delivered to others. I have been on hold for 52 minutes waiting fro the post master at the Plainsboro NJ branch. I hae a picture of my mail box in relation to a parked car. Please call me back at 973 494-1170


The Plainsboro NJ post office has impressive employees! I'm delighted and in particular, so thankful for their thoughtfulness toward my baby dragons crickets (food). I understand that live bugs are not easy to appreciate, but the employees are absolutely incredible in their handling and care.

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