4 places in town are on the National Register, among them a historic district with 108 buildings. Below: 2 old photos and papers, maps from 1904 on, and the census since 1820.
The Jefferson post office opened in 1819, the earliest record of the town by name. Another post office, South Jefferson (1866), opened inside today’s town and later closed.
First census: 1,573 in 18202020 census: 1,333207 years
How historic is Jefferson?
A
More historic than 94% of U.S. towns, on its age, its old homes and the National Register.
Founding year: the first Jefferson post office (Blevins & Helbock, CC0).The full story ↓
History grade
What drives Jefferson’s History grade
On its age, its old homes and the National Register, Jefferson is more historic than 94% of U.S. towns. All 3 inputs are above most U.S. towns; its National Register listings ranks highest and its age lowest.
A
HistoryA character grade: shown, never part of Jefferson’s overall grade.
New York towns list more on the Register than most of the country (a typical New York town has 12.3 per 10,000 residents, the U.S. 2.4), so Jefferson’s 905 sits above most of its state (95% of New York towns have fewer) while its 111 historic buildings outnumber those of 90% of U.S. towns.
How sure. Graded on any two of the three inputs instead, the letter would still be A. The pre-1940 share is a Census survey estimate (±6.2 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 Jefferson’s past
Read from the archive, the National Register and the record. The page puts what stands out first.
Passages that mention Jefferson, cut from the printed page as they were published.
Genealogical and family history of the county of Jefferson, New York1905Read the page →
Read the text
During his boyhood andearly manhood Merritt A. Cleveland worked upon his father's farms, attending school at Houndsfield, Brownville, Dexter and Watertown, all in Jefferson county, until 1869. The following year he joined the civil engineering corps of the Carthage, Watertown and Sackett's Harbor Railroad, where he was employed in constructing the. railroad, and later was employed by the Clayton and Theresa Railroad and also by the Watertown Water Works, and' employed in the .city engineer's office the first year that Watertown was in-
Text read by machine from the scan; it may contain errors.
History of Jefferson County, New York1878 · page 186Read the page →
Read the text
short time, and in advance of his family in the year 1797 he with David Starr and others came and took up timber land in the town of Champion, this county,, and is said to be the first man who chopped a, tree in Jefferson County for the purpose of settlement, and consequently was its first settler. In 1799 he moved his family thither, and began a pioneer life in a trackless wilderness. Struggling with poverty and the hardships coincident with a new country, he carved out a fine
Text read by machine from the scan; it may contain errors.
History of Jefferson County, New York1878 · page 68Read the page →
Read the text
It will be noticed by reference that the present town of Pinckney, in Lewis county, organized February 12, 1808 then a part of the town of Harrison, in Jefferson, was then divided by a line that was a continuation of the west lines of townships 8 and 3, of Boylston's tract; and that from the line between Champion and Denmark, on Black river, the division ran straight to St. Lawrence county, where the line of townships 7 and 11, of tract III., touched the
Text read by machine from the scan; it may contain errors.
Scans and text from the Internet Archive. Books published in 1930 or earlier, which are in the public domain.
Timeline
Jefferson, 1819 to 1912
Woven from the archive, old maps, post office records, the National Register and the people born here.
The Jefferson post office opened in 1819, the earliest record of the town by name (U.S. post office records).
How does Jefferson rank for history?
Jefferson is more historic than 94% 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 Jefferson?
4 listings: 3 buildings, among them the Parker 13-Sided Barn (listed 1984, the first), and 1 historic district, the Jefferson Historic District, with 108 contributing buildings. 111 historic buildings in all.
How old are the homes in Jefferson?
26% of Jefferson’s homes were built before 1940 (Census estimate, ±6.2 points), against a typical 27% for a New York town; the median home was built in 1978.
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 (28), the National Register of Historic Places (4), Wikipedia, U.S. Geological Survey historical maps, U.S. Census counts (via Wikipedia), the US Post Offices dataset (Blevins & Helbock), the USGS Geographic Names Information System and old county and town histories (Internet Archive). Archive images are copied here with their credits and licenses, shown on each photo’s page. Refreshed monthly.