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Postal Services

Contact Us

Postal Services
Phone: (920) 424-1145

Weekdays 7:45 AM to 4:30 PM

650 Witzel Avenue
Oshkosh, WI 54901

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Mail Class Definitions

The cost of mailing varies with each classification.

First Class Mail

Postcards, letters, large envelopes and small packages can be sent using First Class Mail. This service is typically used for business and personal correspondence and bills.

All outgoing mail received by Postal Services will be designated as First Class mail unless marked otherwise. Envelopes must be neatly stuffed — protruding materials will jam the postage machine and cause a delay in processing outgoing mail.

Mail sent to Postal Services with protruding materials will be sent back to the proper department to be corrected.

Priority Mail

Priority mail is First Class mail weighing more than 13 ounces. Priority mail rates are used when 2-3 day service is desired. The maximum weight is 70 lbs and the maximum size is 108″ in length and girth combined.

Mail under 13 ounces can be mailed as Priority Mail but there is an additional fee for this service.

Flat Rate envelopes and boxes are also available at no cost.

Library/Media Rate

The following items are examples of Fourth Class Mail:

  • Sound Recordings
  • Library Materials
  • Bound Printed Matter
  • Printed Matter
  • Product Samples

Each piece of Library or Media matter must not exceed 70 lbs in weight and a maximum size of 108″ in length and girth combined.