Founding year: Wikipedia. First post office: 1797.The full story ↓
History grade
What drives Constantia’s History grade
On its age, its old homes and the National Register, Constantia is more historic than 80% of U.S. towns, #415 of 758 in New York. Its share of homes from before 1940 holds the grade up; its National Register listings pull it down.
A−
HistoryA character grade: shown, never part of Constantia’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 Constantia’s 4.2 sits below most of its state (33% of New York towns have fewer) while its 2 listings outnumber those of 60% 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 (±8.8 points). Two sources give 1793.
Founding year: Wikipedia (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 Constantia’s past
Read from the archive, the National Register and the record. The page puts what stands out first.
Lost post offices, old corners, places now gone and burying grounds
Constantia’s post office has been open since 1813. Five other post offices opened and closed inside today’s town.
Rotterdam
1797–1813
Constantia
1813–today
Cleaveland
1829–1875
Constantia Centre
1849–1902
Bernhard's Bay
1850–today
Cleveland
1875–today
North Constantia
1878–1903
Gayville
1880–1903
17901910today
Hamlets and corners on the map
Barry's Mobile Home ParkBernhards BayBisbo Mobile Home ParkClevelandConstantia CenterDoris ParkDutchervilleGayvilleHolly Park Mobile Home ParkNicholsvilleNorth ConstantiaPanther Lake
Gone or out of use
Dakin Bay SchoolschoolSchool Number 10schoolSchool Number 12schoolSchool Number 13schoolSchool Number 4schoolSchool Number 5schoolSchool Number 6schoolSchool Number 7schoolSchool Number 8school
6cemeteries and burying grounds inside Constantia
Cleveland VillageConstantia CenterConstantia RuralHallLakeside RuralTrinity Church
US Post Offices dataset (Blevins & Helbock, CC0). Places and cemeteries from the USGS Geographic Names Information System (2021).
By decade
Constantia, decade by decade
3 decades in the archive, from the 1860s to the 1910s. Scroll each row; tap a photo for its story.
Nothing in the archives for these yearsWeddings on Main Street, storms, parades, school pictures, the old store. If it’s in your family album, it belongs here.
The town was first settled circa 1793 and was known then as "Rotterdam." Francis Adrian Vanderkemp and Marc Isambard Brunel were two of its citizens. The Town of Constantia was created from part of the Town of Mexico in 1808. In 1825, the town was reduced by the formation of the Town of Hastings, and was reduced again in 1839 to form the Town of West Monroe.
Passages that mention Constantia, cut from the printed page as they were published.
... History of Oswego County, New York1877 · page 121Read the page →
Read the text
In 1873, Mr. A. F. Goodenough began the publication of the Lakeside Neios at the village of Cleveland, in the town of Constantia. In 1874 he was succeeded by Mr. Charles R. King, who changed the name of the journal to The Lakeside Press. It is still published by ]Mr. King under that title, being a vigorous, independent weekly, of twenty-eight columns, which indicates by it-s name its position on the shore of the beautiful Oneida lake.
Text read by machine from the scan; it may contain errors.
settlers into the village, and in 1834: a second store was erected by Augustus Marshall. At this time the town began to improve much more rapidly than before. The village of Constantia was incorporated by a special act passed May 25, 1836. The American iron company sold out in 1836 to the Oneida Lake furnace company, which consisted of Moses W. Lester, C. Woodbridge, J. Tucker, and others. In
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
Constantia, 1793 to 2000
Woven from the archive, old maps, post office records, the National Register and the people born here.
In 1793, according to Wikipedia’s history of the town. Constantia’s post office opened in 1797, and the census of 1820 counted 767 people here.
How does Constantia rank for history?
Constantia is more historic than 80% of U.S. towns, #415 of 758 in New York. 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 Constantia?
Two places: the Trinity Church (listed 1982) and the St. James' Church (1996).
How old are the homes in Constantia?
30% of Constantia’s homes were built before 1940 (Census estimate, ±8.8 points), against a typical 27% for a New York town; the median home was built in 1972.
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 (26), the National Register of Historic Places (2), Wikipedia, 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.