Most of Twin City was built recently: 7% of its homes predate 1940 and the median home dates from 1979. 3 places in town are on the National Register, among them a historic district with 135 buildings. Below: maps from 1971 on and the census since 1930.
The Twin City post office opened in 1952, the earliest record of the town by name. Two smaller post offices, Summit (1887) and Graymont (1897), opened inside today’s city and later closed.
First census: 901 in 19302020 census: 1,64274 years
How historic is Twin City?
C+
More historic than 41% of U.S. towns, on its age, its old homes and the National Register.
Founding year: the first Twin City post office (Blevins & Helbock, CC0).The full story ↓
History grade
What drives Twin City’s History grade
On its age, its old homes and the National Register, Twin City is more historic than 41% of U.S. towns. Its National Register listings hold the grade up; its age pulls it down.
C+
HistoryA character grade: shown, never part of Twin City’s overall grade.
Georgia towns list more on the Register than most of the country (a typical Georgia town has 10.0 per 10,000 residents, the U.S. 2.4), so Twin City’s 665 sits above most of its state (92% of Georgia towns have fewer) while its 138 historic buildings outnumber those of 91% of U.S. towns.
How sure. Graded on any two of the three inputs instead, the letter would range from D to B+. The pre-1940 share is a Census survey estimate (±3.6 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 Twin City’s past
Read from the archive, the National Register and the record. The page puts what stands out first.
Twin City gets its name from the combining of two adjacent towns, Graymont and Summit. The two rival towns were merged in 1924 as Twin City.
Of Twin City's 3.6 square miles (9.3 km2) area, 255 acres (1.03 km2) is included in the Twin City Historic District, listed on the National Register of Historic Places. This includes the historic jail and former city hall building
Every edition of the U.S. Geological Survey’s map of Twin City. Tap a year, or press play to watch the town change.
1971Twin City sheet · 1:24,000
U.S. Geological Survey historical topographic maps (public domain), via Esri’s collection of the scans. The red ring marks the center of Twin City.
People over time
Twin City, census by census
Between 901 and 1,752 people in every census since 1930.
10 censuses, 1930–2020.
U.S. Census Bureau decennial counts, from the census table on Twin City’s Wikipedia page.
Questions about Twin City’s history
What year was Twin City founded?
The Twin City post office opened in 1952, the earliest record of the town by name (U.S. post office records).
How does Twin City rank for history?
Twin City is more historic than 41% 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 Twin City?
Three places: the John Rountree Log House (listed 1997), the Davis-Proctor House (2010) and the Twin City Historic District (2014).
How old are the homes in Twin City?
7% of Twin City’s homes were built before 1940 (Census estimate, ±3.6 points), against a typical 3.8% for a Georgia town; the median home was built in 1979.
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 (4), Wikidata (3), the National Register of Historic Places (3), Wikipedia, Wikidata and Wikipedia for famous people, 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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