Ambrosia, Iowa is now a ghost town although it did have a post office from 1840 to 1857.

 

The star on the map marks to location of the post office at:

Latitude: 40.52444
Longitude: -91.48889

 

In “Remembering the Mormons in Lee County, Iowa: Marking the Past in Montrose and Keokuk” by Alexander L. Baugh, we read:

 

“When the 1840 census was taken, most of the heads of household around Montrose were Mormon, foremost among them, Brigham Young.  (Young himself was then serving as a missionary in England, but his family was residing in one of the barracks of the old fort.)  Montrose Township was organized as a unit of government in 1841, and as Mormon emigrants began to come to Nauvoo, some settled in Lee County.  Population centers at Nashville and Ambrosia, three miles west of Montrose, never were formalized as towns but were designated branches of the Church.”