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Koch is a former community in St. Louis County, Missouri. It was named for Robert Koch, a German bacteriologist. The location was at what is now Interstate 255 east of Route 231. It had a post office, which is now closed.
Robert Koch Hospital, located just off US 255 before it crosses the Jefferson Barracks Bridge in south county at 4101 Koch Road. There is a cemetery located on the grounds of this closed hospital, the building founded in 1875 with its last major renovation in 1949 is said to have been demolished, but the cemetery referred to as "Quarantine" cemetery is located on the 503 acres (2.04 km2) associated with this hospital. Many people believe this site is haunted.
The Robert Koch Hospital for Contagious Disease, was located at 4101 Koch Road in Oakville, south of the city of St. Louis in what is now considered Oakville (in St Louis County)
Nineteen buildings were constructed by 1939 and an 105-acre (0.42 km2) farm, post office, railroad stop, housing, and recreational facilities made the hospital almost self-sustaining. By the end of World War II new medications decreased the life-threatening effects of tuberculosis; from the 1950s to 1983 the hospital was used as housing for the indigent elderly. It also houses an antenna site for St Louis City Emergency Management.
GNIS further gives the historical location of the hospital as 
GNIS gives the location of the Koch post office as unknown.
- "Koch (historical)". Geographic Names Information System. United States Geological Survey. Retrieved 2014-01-22.
- "Koch Hospital (historical)". Geographic Names Information System. United States Geological Survey. Retrieved 2014-01-22.
- "Koch Post Office (historical)". Geographic Names Information System. United States Geological Survey. Retrieved 2014-01-22.
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