Each edition grades its towns against each other only.
More historic than 19% of U.S. towns · #508 of 847 in California. What drives it
Most of Hilmar-Irwin was built recently: 5% of its homes predate 1940 and the median home dates from 1987. Below: maps from 1917 on and the census since 1980.
More historic than 19% of U.S. towns, on its age, its old homes and the National Register.
On its age, its old homes and the National Register, Hilmar-Irwin is more historic than 19% of U.S. towns, #508 of 847 in California. Its share of homes from before 1940 holds the grade up; its National Register listings pull it down.
Few California towns list much on the Register (a typical California town has 0.0 per 10,000 residents, the U.S. 2.4), so Hilmar-Irwin’s 0.0 sits below most of its state (31% of California 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 Hilmar-Irwin’s history is told.
Every edition of the U.S. Geological Survey’s map of Hilmar-Irwin. 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 Hilmar-Irwin.
Wikipedia doesn’t have a history of Hilmar-Irwin yet. The photos, dates and memories neighbors add here are how it gets written.
Hilmar-Irwin is a census-designated place (CDP) in Merced County, California, United States. As of the 2020 census, the population was 5,164.
Its population held steady between the last two censuses: 5,197 in 2010, 5,164 in 2020.
Intro from Wikipedia. Population: U.S. Census Bureau.
Woven from the archive, old maps, post office records, the National Register and the people born here.
Weddings on Main Street, storms, parades, school pictures, the old store. If it’s in your family album, it belongs here.
Between 1,706 and 5,197 people in every census since 1980.
5 censuses, 1980–2020.
U.S. Census Bureau decennial counts, from the census table on Hilmar-Irwin’s Wikipedia page.
Nobody well known was born in Hilmar-Irwin itself, so here are the best known from just nearby.
Another post office, Irwin, opened and closed inside today’s town.
US Post Offices dataset (Blevins & Helbock, CC0). Places and cemeteries from the USGS Geographic Names Information System (2021).
Hilmar-Irwin is more historic than 19% of U.S. towns, #508 of 847 in California. 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.
5% of Hilmar-Irwin’s homes were built before 1940 (Census estimate, ±3.8 points), against a typical 3.4% for a California 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, 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.
