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Encyclopedia Dubuque


"Encyclopedia Dubuque is the online authority for all things Dubuque, written by the people who know the city best.”
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Affiliated with the Local History Network of the State Historical Society of Iowa, and the Iowa Museum Association.


From Encyclopedia Dubuque
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MONROE CALCULATING MACHINE COMPANY INC. The Monroe Calculator Company was a leading maker of adding machines and calculators. The company was founded in 1912 by Jay R. Monroe and was known in 2011 as Monroe Systems for Business. The company has also been known as Monroe Calculating Machine Company, Monroe THE Calculator Company, and Monroe Division of Litton Industries.

For many years, Monroe was headquartered in Orange, New Jersey & Morris Plains, New Jersey with its manufacturing plants in New Jersey and Amsterdam. In 1958, the company was acquired by Litton Industries. Litton sold it in 1984. In the mid-1980s, the company diversified and began carrying a line of private-labeled copiers (manufactured by Mita Corp.) and cross-cut paper shredders, but those items have been discontinued.

In the 1970s and 1980s, the company had some 300 sales and service branch offices in the United States. In 1972, Monroe announced a pocket-sized electronic display calculator at $269. As low cost electronic calculators from Japan became readily available through retail distribution, the mechanical calculator companies like Monroe, Friden, and Marchant declined even as they introduced programmable calculators.

The 1951 Dubuque City Directory listed 426 BANK AND INSURANCE BUILDING.

The 1957 Dubuque City Directory listed 670 Central.

The 1962 and 1964 Dubuque City Directory listed 1169 Iowa.

The 1966 and 1968 Dubuque City Directory listed the same address for Monroe International Inc.

The 1972 Dubuque City Directory listed 1169 for the Monroe Calculator Company.

The 1974 Dubuque City Directory listed 1340 White.

The 1977 through 1980 Dubuque City Directory listed 1340 White. In 1980 is was called Monroe, The Calculator Company.