For statistical purposes, the United States Census Bureau has defined Mehama as a census-designated place (CDP).

[5] Smith laid out the townsite and operated a ferry on the North Santiam.

[5] A post office, misnamed Mehamah, was established in 1877, but the name was changed to Mehama by 1881.

There were 123 housing units at an average density of 259.4 per square mile (100.2/km2).

23.6% of all households were made up of individuals, and 9.1% had someone living alone who was 65 years of age or older.