Postcard:
Must mail first class to get the postcard rate. (If the organization is nonprofit, nonprofit is less expensive than postcard rates but the delivery period of nonprofit is slower)
- Minimum size: 3 1/2 x 5
- Maximum size: 4 1/4 x 6
- Minimum thickness: .007
- Maximum thickness: .016
Letter:
- Minimum size: 3 1/2 x 5
- Maximum size: 6 1/8 x 11 ½
- Minimum thickness: .009
- Maximum thickness: .25
NOTE: If mailing a letter sized stitched booklet, special requirements apply. Please inquire.
Flat:
- Minimum size: 6 1/8 x 11 ½
- Maximum size: 12 x 15
- Minimum thickness: .25
- Maximum thickness: .75
Machinable Parcel:
- Parcels that can be processed on Postal Service Equipment
- Minimum size: 6″ L x 3″ H x .25″ W
- Maximum size: 34″ L x 17″ H x 17″ W
- Minimum weight: 6oz
- Maximum weight: 35lbs
Irregular Parcel:
Parcels that do not meet the dimensional criteria of machinable parcels including: rolls & tubes up to 26″ long & merchandise samples not individually addressed; articles that are not letter or flat size.
Mailing Tutorial Links
- Mailing Data
- CASS-NCOA Information
- Tabbing Tutorial
- Mailing Classifications Tutorial
- Additional Mailing Info