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Benjamin Platt Carpenter (May 14, 1837 – December 24, 1921) was an American lawyer and politician from New York and Montana. He was Governor of the Montana Territory from 1884 to 1885.

B. Platt Carpenter
Benjamin Platt Carpenter (Montana Territorial Governor).jpg
6th Governor of Montana Territory
In office
December 16, 1884 – July 13, 1885
Nominated byChester A. Arthur
Preceded byJohn Schuyler Crosby
Succeeded bySamuel Thomas Hauser
Personal details
Born(1837-05-14)May 14, 1837
Stanford, New York
DiedDecember 24, 1921(1921-12-24) (aged 84)
Chula Vista, California
Resting placePoughkeepsie Rural Cemetery
Poughkeepsie, New York
Political partyRepublican
Spouse(s)Esther Thorn


Carpenter was born in Stanford, Dutchess County, New York. He graduated from Union College in 1857, and studied law. He was admitted to the bar and practiced in Poughkeepsie, New York. On November 24, 1860, he married Esther Thorn, and they had three children.

Carpenter was District Attorney of Dutchess County from 1864 to 1869; a delegate to the New York State Constitutional Convention of 1867-68; a delegate to the 1868 and 1884 Republican National Conventions; a member of the New York State Senate (11th D.) in 1876 and 1877; and Judge of the Dutchess County Court from 1878 to 1882.

At the New York state election, 1882, he ran for Lieutenant Governor of New York on the Republican ticket with Charles J. Folger, but they were heavily defeated by Democrats Grover Cleveland and David B. Hill.

In December 1884, he was appointed by President Chester A. Arthur as Governor of the Montana Territory, and on December 31, 1884, he left Poughkeepsie for Helena, Montana. After a short tenure, he was removed from office by the new Democratic President, Grover Cleveland, but he stayed in Montana, and was a delegate to the Montana State Constitutional Convention of 1889.

On December 24, 1921, Carpenter died in Chula Vista, San Diego County, California. He was buried at Poughkeepsie Rural Cemetery.

His brother Jacob B. Carpenter (1826–1894) was Mayor of Poughkeepsie in 1875.


New York State Senate
Preceded by
Benjamin Ray
New York State Senate
11th District

Succeeded by
Stephen H. Wendover
Party political offices
Preceded by
Chester A. Arthur
Chairman of the New York State Republican Committee
Succeeded by
James D. Warren
Political offices
Preceded by
John Schuyler Crosby
Territorial Governor of Montana
Succeeded by
Samuel Thomas Hauser