The U.S. Postal Service encourages everyone to file or mail their tax returns soon. Postal Service Spokesman David Rupert said all Wyoming Post Office retail windows will be open with regular customer service hours, but will not be staying open late on April 15th.

If you must wait until the last minute, the Cheyenne Main Office at 4800 Converse Avenue will accept returns for postmarking only, up to midnight on April 15th. The collection boxes both inside and outside will be available for properly stamped envelopes. There will be no retail services provided.

As a reminder:

  • Make sure you put the proper postage on your return.
  • Make sure you print the proper IRS address on the front of the envelope.
  • Print your return address in the upper-left-hand corner of your tax mail envelope.
  • Customers who wish certification that their tax mail form was sent, should send it Certified Mail.