Which 1935 company first published Monopoly nationally in the United States?

Parker Brothers first published Monopoly nationally in the United States in 1935.

The company acquired Charles Darrow's version of the game and released it during a period when board games were becoming important household entertainment. Parker Brothers' national publication helped establish Monopoly as a major commercial game rather than a locally circulated design.

Parker Brothers was an American game manufacturer founded in Salem, Massachusetts, in 1883 by George Parker. Its catalog included many games before Monopoly, and the company remained associated with the Monopoly brand for decades. Hasbro later acquired Parker Brothers as part of its expansion in the games industry.

Waddingtons published a well-known British edition, but it was not the company that first published the game nationally in the United States. Likewise, Hasbro is the modern corporate owner associated with Monopoly, while Parker Brothers is the historically specific answer for the 1935 American publication.