|Elevation||738 ft (225 m)|
|Time zone||UTC-6 (Central (CST))|
|• Summer (DST)||UTC-5 (CDT)|
|GNIS feature ID||455958|
Dorchester is an unincorporated community in northwestern Allamakee County, Iowa, United States. It lies along local roads just off Iowa Highway 76, north of the city of Waukon, the county seat of Allamakee County. Its elevation is 738 feet (225 m). The town was originally settled by Harvey Bell and Edmund Bell, and was named after Dorchester, England. Although Dorchester is unincorporated, it has a post office, with the ZIP code of 52140, which opened on 21 May 1857. Dorchester is located in Waterloo Township. Dorchester was platted in 1873.
Dorchester's location in the flood plain of the Upper Iowa River makes it vulnerable to flooding; the community was damaged by high waters in August 2007. It was worse hit on 8 June 2008 and succeeding days: over seven inches (over 18 cm) of rain fell on the eighth, and resulting record high floods of 22½ feet (20½ m) almost destroyed a trailer park that was a significant part of the tiny community. A LP gas tank from Dorchester was discovered just eight hours later in Lansing, on the opposite side of the county.
- Rand McNally. The Road Atlas '08. Chicago: Rand McNally, 2008, p. 39.
- U.S. Geological Survey Geographic Names Information System: Dorchester, Iowa
- Savage, Tom (2007). A Dictionary of Iowa Place-Names. University of Iowa Press.
- Zip Code Lookup Archived June 15, 2011, at the Wayback Machine
- U.S. Geological Survey Geographic Names Information System: Dorchester Post Office
- Hancock, Ellery M. (1913). Past and Present of Allamakee County, Iowa: A Record of Settlement, Organization, Progress and Achievement, Volume 1. S. J. Clarke publishing Company. p. 307.
- Alexander, W. E. (1882). History of Winneshiek and Allamakee Counties, Iowa. Western Publishing Company. pp. 401.
- Entire Neighborhood Destroyed, KAAL, 2008-06-10. Accessed 2008-06-14.
- NE Iowa town inundated by Upper Iowa River flood waters, La Crosse Tribune, 2008-06-10. Accessed 2008-06-14.
- Dorchester residents work to recover from last weekend's flash flooding Archived June 8, 2011, at the Wayback Machine, Waukon Standard, 2008-06-20. Accessed 2008-06-20.
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