The post offices in the Indian Nations after the Civil War ended, continued to use "ARK" or "CN" in their town marks until the "Indian Territory" was organized and "IT" became the locus identifier for all the post offices in Oklahoma. Posted here are covers from the period roughly from June 1865 to 1870 with the former identifiers.
Usages of the 1869 issue are listed in a separate table at the bottom of this page.
New covers added 2023-03-08