Postal Services
Skip to main contentDiGiorgio Campus Center Lower Level, Rock Hill, SC  29733    803/323-2293   

Who's Who in the Post Office

Student Information

Transaction Times and Route Schedule

Preparation for Departmental Pick-Up

Personal Mail Policy

Intra-Campus Mail

Metered Mail

What Are You Mailing

Choosing a Service for Mailing

Adding Extra Services

Addressing Your Mailing

Service Endorsements Reference Chart

Preparing Packages for Mailing

Correct State Abbreviations for Mailing

US Postal Service Rates Chart for Postage

Standard Mailing Preparation

What Are You Mailing

Knowing the shape of your mail helps select the right services.


Interior shot of Winthrop's Post OfficeA Rectangular cardstock mail piece not contained in an envelope.
The minimum size for a postcard is 5 inches in length and 3 inches in height. Anything under this minimum size cannot be mailed and is not considered by the Post Office as a qualified piece of mail.

The maximum size for a postcard is 6 inches in length and 4 inches in height. Anything over this size is considered a letter and must have first class letter postage.

When creating a post card, be sure to put the mailing address to the right side towards the bottom leaving room on the right side top for postage.


Small rectangular mail piece no thicker than inch.
The minimum size for a letter is 5 inches in length and 3 inches in height  letters not meeting this minimum size cannot be mailed.
The maximum size for a letter is 11 inches in length and 6 1/8 inches in height.  Any piece exceeding this size will  be sent as a flat, unless it's contents contains something that cannot be bent, it will then be classified as a parcel and receive parcel rates.

Large Envelope

Flat rectangular mail piece no thicker than inches.  The contents must not contain anything that cannot be bent.  If the contents is not flexible the envelope must then be charged a parcel rate.
The minimum size is 11 inches in length and 6 1/8 inches in height.  Any envelopes under this minimum but over letter minimum, will be sent First Class letter rate.


A three dimensional mail piece contained in a box, thick envelope, or tube, weighing up to 70 pounds. Length and girth(distance around the thickest part of the package) cannot exceed 130 inches.
Any item over 25 pounds must be brought to the Digorgio Center Post Office, as postal personnel are unable to accept items over 25 pounds. The Postal Specialist must walk for most of their route so they are unable to pick up any articles or mailings with a single piece weight of over 25 pounds.  We will pick up as many mailing tubs as you need as long as the individual weight does not exceed 25 pounds.  We ask that you call the Post Office at 2293 if you have a heavy mailing going out so we can plan our pick ups accordingly. Large mailings can only be picked up in USPS mail buckets or trays.  Please call us in advance if you need them delivered to you.



United States Postal Service


Rock Hill, South Carolina   29733
Copyright 2005 - 2007 Winthrop University
University Disclaimer Statement