Each edition grades its towns against each other only.
Among the newest of U.S. towns · #244 of 247 in Missouri. What drives it
Most of Clarkson Valley was built recently: 0.2% of its homes predate 1940 and the median home dates from 1982. Below: maps from 1945 on and the census since 1960.
Clarkson Valley first appears in the census in 1960.
Among the newest of U.S. towns, on its age, its old homes and the National Register.
On its age, its old homes and the National Register, Clarkson Valley is among the newest of U.S. towns, #244 of 247 in Missouri. Its National Register listings hold the grade up; its age pulls it down.
Missouri towns list about as much on the Register as the country (a typical Missouri town has 2.4 per 10,000 residents, the U.S. 2.4), so Clarkson Valley’s 0.0 sits below most of its state (23% of Missouri towns have fewer) while its 0 listings outnumber those of 23% of U.S. towns.
Founding year: the first census (other dates in Quick answers). Homes: Census ACS 2020–24. National Register: National Park Service, May 2026 list; each listing counted once (boundary changes and added documentation belong to their listing), and a historic district counts its contributing buildings. How TownRatings grades history →
Read from the archive, the National Register and the record. The page puts what stands out first.
The first neighbors to add old photos shape how Clarkson Valley’s history is told.
Wikipedia doesn’t have a history of Clarkson Valley yet. The photos, dates and memories neighbors add here are how it gets written.
Clarkson Valley is a city in Chesterfield Township, St. Louis County, Missouri, United States. The population was 2,609 at the 2020 census.
Its first post office opened in 1960. Its population held steady between the last two censuses: 2,632 in 2010, 2,609 in 2020.
Intro from Wikipedia. Population: U.S. Census Bureau.
Weddings on Main Street, storms, parades, school pictures, the old store. If it’s in your family album, it belongs here.
Every edition of the U.S. Geological Survey’s map of Clarkson Valley. Tap a year, or press play to watch the town change.
U.S. Geological Survey historical topographic maps (public domain), via Esri’s collection of the scans. The red ring marks the center of Clarkson Valley.
Between 137 and 2,675 people in every census since 1960.
7 censuses, 1960–2020.
U.S. Census Bureau decennial counts, from the census table on Clarkson Valley’s Wikipedia page.
Nobody well known was born in Clarkson Valley itself, so here are the best known from just nearby.
Each neighbor’s History grade, on the same three inputs.
The Clarkson Valley post office opened in 1960, the earliest record of the town by name (U.S. post office records).
Clarkson Valley is among the newest of U.S. towns, #244 of 247 in Missouri. The History grade combines the town’s founding era, the share of homes built before 1940 and its National Register listings. It’s a character grade, so it isn’t part of the overall grade. How it works.
0.2% of Clarkson Valley’s homes were built before 1940 (Census estimate), against a typical 8.4% for a Missouri town; the median home was built in 1982.
What the archives can’t tell you, neighbors can.
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).
From U.S. Geological Survey historical maps, U.S. Census counts (via Wikipedia) 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.
