Caswell Postal History
Aroostook County, Maine
a project of
V. F. Thomas Co. - P. O. Box 111 - Shawmut, Maine 04975
info@vfthomas.com
(updated 12 July 2021)
During the history of Caswell, there has been only one post office.
Briefly, the history of this one is as follows:
1. Pleasant Ridge post office opened on 25 April 1878 and was changed on 28 August 1880 to Caswell post office. Caswell post office closed on 22 December 1894, re-opened on 3 August 1908, and closed on 17 November 1908.
In 1914, there was no post office in Caswell. (source: Post Route Map of the State of Maine 1914)

(click on image to enlarge)
Postmark from Castle Hill:
Caswell
1880 August 28:
The former Plesant Ridge post office was changed to Caswell post office. (source: Maine Philatelic Society. 1995. The Post Offices of Maine: A Rarity Guide.)
1894 December 22:
Caswell post office closed. (source: Maine Philatelic Society. 1995. The Post Offices of Maine: A Rarity Guide.)
1908 August 3:
Caswell post office re-opened. (source: Maine Philatelic Society. 1995. The Post Offices of Maine: A Rarity Guide.)
1908 November 17:
Caswell post office closed. (source: Maine Philatelic Society. 1995. The Post Offices of Maine: A Rarity Guide.)
Pleasant Ridge
1878 April 25:
Plesant Ridge post office opened. (source: Maine Philatelic Society. 1995. The Post Offices of Maine: A Rarity Guide.)
1880 August 28:
Pleasant Ridge post office was changed to Caswell post office. (source: Maine Philatelic Society. 1995. The Post Offices of Maine: A Rarity Guide.)