1818 December 26:
Brewer (2) post office opened. (source: Maine Philatelic Society. 1995. The Post Offices of Maine: A Rarity Guide.)
date?:
Brewer (2) post office.
1900 December 31:
Brewer (2) post office closed. (source: Maine Philatelic Society. 1995. The Post Offices of Maine: A Rarity Guide.)
1961 October 1:
Brewer (2) post office re-opened. (source: Maine Philatelic Society. 1995. The Post Offices of Maine: A Rarity Guide.)
1914 December 25 through 1924 April 29:
The circular postmark is 25–26 mm in diameter.
1946 August 28 through 1950 June 20:
The circular postmark is 29–30 mm in diameter.
today:
Brewer (2) post office is still in operation.
Brewer Branch Bangor
1903:
Brewer Br. Bangor post office opened. (source: Maine Philatelic Society. 1995. The Post Offices of Maine: A Rarity Guide.)
19-- December [18?]:
The circular postmark is 24–25 mm in diameter.
1961 October 1:
Brewer Br. Bangor post office closed. (source: Maine Philatelic Society. 1995. The Post Offices of Maine: A Rarity Guide.)
Brewer Station Bangor
1900 December 31:
The former Brewer (2) post office was renamed as Brewer Sta. Bangor post office. (source: Maine Philatelic Society. 1995. The Post Offices of Maine: A Rarity Guide.)
1901 February 7 through 1901 February 14:
The circular postmark is 25–26 mm in diameter.
1903:
Brewer Sta. Bangor post office renamed as Brewer Br. Bangor post office. (source: Maine Philatelic Society. 1995. The Post Offices of Maine: A Rarity Guide.)
South Brewer
1899 June 3:
South Brewer post office opened. (source: Maine Philatelic Society. 1995. The Post Offices of Maine: A Rarity Guide.)
1899 June 12 through 1901 December 13: [each year determined from reverse side]
The circular postmark is 28–29 mm in diameter.
1926 March 31:
South Brewer post office closed. (source: Maine Philatelic Society. 1995. The Post Offices of Maine: A Rarity Guide.)
1938 October 22: [earliest known]
South Brewer post office re-opened. (source: Maine Philatelic Society. 1995. The Post Offices of Maine: A Rarity Guide.)
today:
South Brewer post office is still in operation.
South Brewer Branch Bangor
1926 March 31:
South Brewer Branch Bangor post office opened. (source: Maine Philatelic Society. 1995. The Post Offices of Maine: A Rarity Guide.)
1935 August 19:
The circular postmark is approximately 25 mm in diameter.
1938 October 27:
This was the last known use before changing to South Brewer post office. (source: Maine Philatelic Society. 1995. The Post Offices of Maine: A Rarity Guide.)