Most of Green Hill was built recently: 0.0% of its homes predate 1940 and the median home dates from 2010. Below: 1 old photo or paper and maps from 1942 on.
The town was platted on March 5, 1832, by William B. Bailey and his brother Horatio who named it Milford, for their home town of Milford, Delaware. The plat included 48 lots, two north–south streets (Main and East) and three east–west streets (Pine, Center and Warren). The first store opened in 1833 and was followed in subsequent years by several more businesses, including a liquor store, blacksmith, grocery, tannery, shoe-maker, wagon-maker and others. A post office was established on December 2, 1837, as Poolesville, in honor of the town's first resident physician, Dr. Poole — it retained the name until August 13, 1904.
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 →
From Wikimedia Commons (3), Wikipedia and U.S. Geological Survey historical maps. Archive images are copied here with their credits and licenses, shown on each photo’s page. Refreshed monthly.