Altheimer is a city in Jefferson County, Arkansas, United States. Its population was 1,192 at the 2000 U.S. census. It is included in the 'Pine Bluff Metropolitan Statistical Area'.
Altheimer is located at 34°19′19″N 91°50′46″W / 34.32194°N 91.84611°W / 34.32194; -91.84611 (34.321827, -91.846240).
According to the United States Census Bureau, the city has a total area of 2.2 square miles (5.6 km²), all of it land. Altheimer is part of Timberlands Region of Arkansas, a region rich in natural resources that was discovered by pioneers from the Eastern United States in the early 19th century. Deer hunting, bass fishing, timber and oil are plentiful in this area.