Most of Philadelphia was built recently: 8% of its homes predate 1940 and the median home dates from 1987. Below: 4 old photos and papers and maps from 1949 on.
Wikipedia doesn’t have a history of Philadelphia yet. The photos, dates and memories neighbors add here are how it gets written.
Philadelphia is an unincorporated community and census-designated place in western Marion County, Missouri, United States. It is located 12 miles (19 km) west of Palmyra on Missouri Route 168. The community is part of the Hannibal Micropolitan Statistical Area. Philadelphia was platted in 1835. The community was named after Philadelphia, Pennsylvania. A post office called Philadelphia has been in operation since 1847. Philadelphia was first listed as a census-designated place for the 2020 census, at which time it had a population of 206.
Philadelphia was established in 1835.
Intro from Wikipedia. Population: U.S. Census Bureau.
By decade
Philadelphia, decade by decade
2 decades in the archive, from the 1850s to the 1910s. Scroll each row; tap a photo for its story.
Nothing in the archives for these yearsWeddings on Main Street, storms, parades, school pictures, the old store. If it’s in your family album, it belongs here.
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 the Library of Congress (4), U.S. Geological Survey historical maps, 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.