Joanna’s post office opened in 1948
More historic than 10% of U.S. towns. What drives it
Most of Joanna was built recently: 6% of its homes predate 1940 and the median home dates from 1958.
How Joanna began
When was Joanna founded?
The Joanna post office opened in 1948, the earliest record of the town by name. Four smaller post offices, Huntsville (1814), Milton (1824) and Martin's Depot (1853), opened inside today’s town and later closed.
How historic is Joanna?
More historic than 10% of U.S. towns, on its age, its old homes and the National Register.
What drives Joanna’s History grade
On its age, its old homes and the National Register, Joanna is more historic than 10% of U.S. towns. Its share of homes from before 1940 holds the grade up; its age pulls it down.
South Carolina towns list more on the Register than most of the country (a typical South Carolina town has 3.2 per 10,000 residents, the U.S. 2.4), so Joanna’s 0.0 sits below most of its state (23% of South Carolina towns have fewer) while its 0 listings outnumber those of 23% of U.S. towns.
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 →
Lost post offices
Joanna’s post office has been open since 1948. Four other post offices 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).
Questions about Joanna’s history
What year was Joanna founded?
The Joanna post office opened in 1948, the earliest record of the town by name (U.S. post office records).
How does Joanna rank for history?
Joanna is more historic than 10% 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.
How old are the homes in Joanna?
6% of Joanna’s homes were built before 1940 (Census estimate, ±7.2 points), against a typical 3.5% for a South Carolina town; the median home was built in 1958.
Memory lane
What the archives can’t tell you, neighbors can.
Where this page comes from
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 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.