Allegany is an unincorporated community in Coos County, Oregon, United States.

[3] A post office was established at Allegany on March 25, 1893, and it is unknown why this spelling was chosen.

Allegany is used for several geographic features in the state of New York, while Allegheny is the preferred spelling in Pennsylvania.

[5] Due to the lack of good roads and other more modern transportation in these areas, the small (14 tons) gasoline-propeller Welcome, built 1919, was on the run up the Coos River from Marshfield to Allegany until 1948.

This Coos County, Oregon state location article is a stub.