Most of Hillsboro was built recently: 3% of its homes predate 1940 and the median home dates from 1991. Below: maps from 1936 on and the census since 1880.
Hillsboro began in the late 1830s as a small community known as "Gilmersville," which was located east of the current town. The name was inspired by a family of early settlers. When the railroad was constructed through the area in the 1860s, the town shifted to its current location along the tracks. The town developed throughout the latter half of the 19th century as an important refueling stop for trains and a local shipping center. The town's name was eventually changed to "Hillsborough," and the current spelling was adopted in 1891.
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 (5), Wikipedia, Wikidata and Wikipedia for famous people, U.S. Geological Survey historical maps, U.S. Census counts (via Wikipedia), the US Post Offices dataset (Blevins & Helbock) and the USGS Geographic Names Information System. Archive images are copied here with their credits and licenses, shown on each photo’s page. Refreshed monthly.