If you have a census you would like to add, contact the webmaster to get it posted here.
- Cushing “Express” Label (v1.2)
- Edey “Express” Covers (v1.0)
- Pioneer Express Covers (v1.0)
- Giant DUE Markings (v1.1)
- Hanging Lincoln Covers (v1.0)
- Letters and Envelopes of the Dead Letter Office (v1.0)
- Memphis Due Markings on Cover (v1.1)
- New Orleans – Plus (miscellaneous)
- Official Envelopes of the Finance Bureau (v1.1)
- Southern Letter Unpaid Marking (v1.1)
- Straight-Line Postmarks (v1.3) Updated – 10 Apr 25