Putnam is a town in Callahan County, Texas, United States.

According to the United States Census Bureau, the town has a total area of 1.0 square mile (2.6 km2), all land.

[5] The climate in this area is characterized by hot summers and generally mild to cool winters.

[6] As of the 2020 United States census, there were 63 people, 41 households, and 26 families residing in the town.

The town of Putnam is served by the Baird Independent School District.