Greenwich’s post office opened in 1874
Most of Greenwich was built recently: 0.0% of its homes predate 1940 and the median home dates from 1977.
How Greenwich began
When was Greenwich founded?
The Greenwich post office opened in 1874, the earliest record of the town by name.
History across the town line
Each neighbor’s History grade, on the same three inputs.
Questions about Greenwich’s history
What year was Greenwich founded?
The Greenwich post office opened in 1874, the earliest record of the town by name (U.S. post office records).
Memory lane
What the archives can’t tell you, neighbors can.
Where this page comes from
Founding dates: Wikidata, Wikipedia, the U.S. post office records of Blevins & Helbock (CC0) and the Census. Homes by year built: Census ACS 2020–24. National Register of Historic Places: National Park Service (list of May 22, 2026). Old photos, postcards and papers: Wikimedia Commons, the Library of Congress and other public archives, credited on each item’s page. Maps: U.S. Geological Survey historical topographic maps (via Esri) and Sanborn fire-insurance maps (Library of Congress). History text and census tables: Wikipedia (CC BY-SA 4.0). Places that used to be: USGS Geographic Names Information System (2021). How TownRatings grades history →