Putnam is an unincorporated community and census-designated place (CDP) in southwest Marengo County, Alabama, United States. As of the 2020 census, its population was 172.
Putnam is located in the southwest corner of Marengo County, along Alabama State Route 69. It is southwest of Linden, the county seat, and north of Coffeeville.
According to the U.S. Census Bureau, the Putnam CDP has an area of , all of it recorded as land. It is bordered to the north by Horse Creek and to the south by Big Bunny Creek, west-flowing tributaries of the Tombigbee River.
Putnam was listed as a census designated place in the 2010 U.S. census.
As of the 2010 United States census, there were 193 people living in the CDP. The racial makeup of the CDP was 72.5% Black, 23.3% White, 2.6% Native American and 1.6% from two or more races.