Each edition grades its towns against each other only.
Among the newest of U.S. towns. What drives it
Most of Sleepy Hollow was built recently: 0.0% of its homes predate 1940 and the median home dates from 1987. Below: maps from 1971 on.
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, Sleepy Hollow is among the newest of U.S. towns. Its National Register listings hold the grade up; its share of homes from before 1940 pulls it down.
Wyoming towns list more on the Register than most of the country (a typical Wyoming town has 25.1 per 10,000 residents, the U.S. 2.4), so Sleepy Hollow’s 0.0 sits below most of its state (16% of Wyoming towns have fewer) while its 0 listings outnumber those of 23% of U.S. towns.
Founding year: our sources. 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 Sleepy Hollow’s history is told.
Wikipedia doesn’t have a history of Sleepy Hollow yet. The photos, dates and memories neighbors add here are how it gets written.
Sleepy Hollow is a census-designated place (CDP) in Campbell County, Wyoming, United States. The population was 1,308 at the 2010 census.
Between the 2010 and 2020 censuses its population fell from 1,308 to 1,227 (-6%).
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.
The U.S. Geological Survey’s map of Sleepy Hollow.
1971The Gap sheet · 1:24,000U.S. Geological Survey historical topographic maps (public domain), via Esri’s collection of the scans. The red ring marks the center of Sleepy Hollow.
Nobody well known was born in Sleepy Hollow itself, so here are the best known from just nearby.
Sleepy Hollow is among the newest of U.S. towns. 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.
0.0% of Sleepy Hollow’s homes were built before 1940 (Census estimate, ±2.2 points), against a typical 12% for a Wyoming town; the median home was built in 1987.
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. Archive images are copied here with their credits and licenses, shown on each photo’s page. Refreshed monthly.