Each edition grades its towns against each other only.
More historic than 17% of U.S. towns. What drives it
Most of Callahan was built recently: 1% of its homes predate 1940 and the median home dates from 2003. Below: maps from 1917 on and the census since 1920.
The Callahan post office opened in 1858, the earliest record of the town by name.
More historic than 17% of U.S. towns, on its age, its old homes and the National Register.
On its age, its old homes and the National Register, Callahan is more historic than 17% of U.S. towns. Its age holds the grade up; its share of homes from before 1940 pulls it down.
Few Florida towns list much on the Register (a typical Florida town has 0.0 per 10,000 residents, the U.S. 2.4), so Callahan’s 0.0 sits below most of its state (33% of Florida 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 →
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 Callahan’s history is told.
Every edition of the U.S. Geological Survey’s map of Callahan. 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 Callahan.
From Wikipedia’s history of Callahan.
The Battle of Alligator Bridge took place around Callahan on June 30, 1778, and was the only major engagement in an unsuccessful campaign to conquer British East Florida during the American Revolutionary War. The Town of Callahan was settled in 1856, but officially incorporated as a municipality in 1911.
Text from Wikipedia, licensed CC BY-SA 4.0.
2021NB US 1-23; Welcome to Callahan Sign
2021NB US 1-23; SB US 301, Left Lane
2021NB US 1-23 Enters
2021NB US 1-23 @ US 301 and FL A1A-200
2021NB US 1-23 @ North End of FL 115;
2021Callahan Fire Department on US 1-23
2013WNHSCallahan
2013CallahanFLMontage
2013A1AnRoadEnd-US1nsUS23nsUS301ns-CallahanFL
2012FerrisWheelCallahan
2008FEMA - 38846 - FEMA Debris Specialist in Nassau County
2008FEMA - 38826 - PIO at Nassau Community Meeting
2008FEMA - 38825 - PIO at Nassau Community Meeting
2008FEMA - 38824 - PIO at Nassau Community Meeting
2008FEMA - 38806 - IA Interview at Nassau DRC
2008FEMA - 38804 - PIO at Nassau County DRC
2008FEMA - 38802 - MDRC at Nassau DRC
2004FLMap-doton-CallahanGrew from 511 people in 1920 to 1,526 in 2020.
11 censuses, 1920–2020.
U.S. Census Bureau decennial counts, from the census table on Callahan’s Wikipedia page.
Nobody well known was born in Callahan itself, so here are the best known from just nearby.
Callahan’s post office has been open since 1858.
US Post Offices dataset (Blevins & Helbock, CC0). Places and cemeteries from the USGS Geographic Names Information System (2021).
The Callahan post office opened in 1858, the earliest record of the town by name (U.S. post office records).
Callahan is more historic than 17% 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.
1% of Callahan’s homes were built before 1940 (Census estimate, ±1.4 points), against a typical 0.6% for a Florida town; the median home was built in 2003.
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 Wikimedia Commons (18), 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.
