Founding year: the first Erin post office (Blevins & Helbock, CC0).The full story ↓
History grade
What drives Erin’s History grade
On its age, its old homes and the National Register, Erin is more historic than 66% of U.S. towns. Its National Register listings hold the grade up; its age pulls it down.
B+
HistoryA character grade: shown, never part of Erin’s overall grade.
Tennessee towns list more on the Register than most of the country (a typical Tennessee town has 6.1 per 10,000 residents, the U.S. 2.4), so Erin’s 28.4 sits above most of its state (79% of Tennessee towns have fewer) while its 3 listings outnumber those of 65% of U.S. towns.
How sure. Graded on any two of the three inputs instead, the letter would range from B− to A−. The pre-1940 share is a Census survey estimate (±5.6 points). The founding year is the first post office, not a stated founding date.
Founding year: the first post office (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 →
What stands out about Erin’s past
Read from the archive, the National Register and the record. The page puts what stands out first.
The city was perhaps named for Erin, a poetic name for Ireland.
Each year in March, beginning in 1962 the town has held a weeklong Irish festival, one of the top ten celebrations in the U.S., with a parade, banquets, pageants, arts and crafts, and other events celebrating Erin's Irish heritage and honoring the sacrifice of Irish railroad workers who helped link Erin to the rest of the world.
An F3 tornado struck Erin on May 27, 2000, tearing roofs and walls from many homes, destroying a pavilion, and leaving 50 people in need of overnight shelter.
The Erin post office opened in 1868, the earliest record of the town by name (U.S. post office records).
How does Erin rank for history?
Erin is more historic than 66% 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.
What is on the National Register in Erin?
Three places: the V. R. Harris House (listed 1983), the Erin Limekilns (2004) and the Quarry Limekiln (2004).
How old are the homes in Erin?
20% of Erin’s homes were built before 1940 (Census estimate, ±5.6 points), against a typical 4.9% for a Tennessee town; the median home was built in 1982.
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 Wikimedia Commons (5), Wikidata (2), the National Register of Historic Places (3), Wikipedia, 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.
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