Half of Clay Township’s homes were built after 1982
Most of Clay Township was built recently: 0.0% of its homes predate 1940 and the median home dates from 1982. Below: maps from 1903 on and the census since 1890.
Wikipedia doesn’t have a history of Clay Township yet. The photos, dates and memories neighbors add here are how it gets written.
Clay Township is one of nine townships in Pike County, Indiana, United States. As of the 2020 census, its population was 325 and it contained 137 housing units. As of the 2010 census, the United States Census Bureau reported that 2010 median center of population of the United States was in Clay Township, 7.1 miles (11.4 km) southwest of Petersburg.
Between the 2010 and 2020 censuses its population fell from 349 to 325 (-7%).
Intro from Wikipedia. Population: U.S. Census Bureau.
Timeline
Clay Township, 1845 to 1955
Woven from the archive, old maps, post office records, the National Register and the people born here.
Every edition of the U.S. Geological Survey’s map of Clay Township. Tap a year, or press play to watch the town change.
1903Petersburg sheet · 1:62,500
U.S. Geological Survey historical topographic maps (public domain), via Esri’s collection of the scans. The red ring marks the center of Clay Township.
People over time
Clay Township, census by census
Between 325 and 1,257 people in every census since 1890.
14 censuses, 1890–2020.
U.S. Census Bureau decennial counts, from the census table on Clay Township’s Wikipedia page.
Places that used to be
Lost post offices, old corners and burying grounds
Another post office, Union, opened and closed inside today’s town.
Hamlets and corners on the map
Union
5cemeteries and burying grounds inside Clay Township
BethlehemCattFrederickIndependent Order of Odd FellowsOdd Fellows
US Post Offices dataset (Blevins & Helbock, CC0). Places and cemeteries from the USGS Geographic Names Information System (2021).
Stories next door
History across the town line
Each neighbor’s History grade, on the same three inputs.
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 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.