Hamer is a city in Jefferson County, Idaho, United States. It is part of the Idaho Falls, Idaho Metropolitan Statistical Area. The population was 12 at the 2000 census.
Hamer is located at 43°55′2″N 112°11′53″W / 43.91722°N 112.19806°W / 43.91722; -112.19806 (43.917085, -112.198009).
According to the United States Census Bureau, the city has a total area of 0.2 square miles (0.5 km²), all of it land.