According to the U.S. Census Bureau, the city of Eldon has a total area of , all land. The city sits on high ground: the northwest side of the city drains toward South Moreau Creek, part of the Moreau River watershed flowing to the Missouri River, while the northeast side of the city is the source of Blythes Creek, a tributary of South Moreau Creek. The southeast side of Eldon drains into Saline Creek, a tributary of the Osage River, which in turn flows northeasterly to the Missouri.
According to th?e U.S. Census Bureau, the city of Eldon has a total area of , all land. The cit?y sits on high ground: the northwest side of the city drains toward South Moreau Creek, part of the Moreau River watershed flow?ing to the Missouri River, while the northeast side of the city is the source of Blythes !Creek, a tributary of South Moreau Creek. The southeast side of Eldon drains into Saline Creek, a tributary of the Osage River, which in turn flows. northeasterly to the Missouri.