Some information of use from adjacent states:
Postal History Societies
- Missouri Postal History Society
- A checklist of all the places in Missouri that ever had a post office
- Illinois Postal History Society
- We invite anybody interested in Illinois and Midwest postal history to join.
- Ohio Postal History Society
- Founded in Cleveland on March 6, 1976, the Ohio Postal History Society is a non-profit corporation dedicated to the study of the postal history -- the post offices, postal routes, and postal markings -- of the state of Ohio. The Society publishes the Ohio Postal History Journal quarterly, and periodically publishes other works relating to Ohio postal history.
- Michigan’s Postal History Society
- Postmarks From the Past is dedicated to writing about and preserving Michigan postal history, in particular those post offices which have closed.