Putnam is a town in Dewey County, Oklahoma, United States.

According to the United States Census Bureau, Putnam has a total area of 0.10 square miles (0.26 km2), all land.

There were 30 housing units at an average density of 296.8 per square mile (114.6/km2).

20.0% of all households were made up of individuals, and 10.0% had someone living alone who was 65 years of age or older.

There were no families and 3.4% of the population living below the poverty line, including no under eighteens and none of those over 64.