JEFFERSON COUNTY, NY HISTORY AND LOOKUP

County History Books

A History of Jefferson County in the State of New York by Franklin Benjamin Hough, (1854) – 618 Pages
Source: Internet Archive
Book ID: CH.2024.01.31.0326.CD.AR

History of Jefferson County, New York by Samuel W. Durant And Henry B. Pierce, (1878) – 844 Pages
Source: Internet Archive
Book ID: CH.2024.05.30.1149 .CD.AR

The North Country, a History, Embracing Jefferson, St. Lawrence, Oswego, Lewis and Franklin Counties, New York Volume 1 by Harry Fay Landon (1932) – 608 Pages
Source: Internet Archive
Book ID: CH.2025.08.19.2050.AR

The North Country, a History, Embracing Jefferson, St. Lawrence, Oswego, Lewis and Franklin Counties, New York Volume 2 by Harry Fay Landon (1932) – 642 Pages
Source: Internet Archive
Book ID: CH.2025.08.19.2055.AR

The North Country, a History, Embracing Jefferson, St. Lawrence, Oswego, Lewis and Franklin Counties, New York Volume 3 by Harry Fay Landon (1932) – 716 Pages
Source: Internet Archive
Book ID: CH.2025.08.19.2059.AR

Jefferson County, New York: A Genealogical Overview

Positioned in the “North Country” of New York State, Jefferson County is a region defined by its vast natural borders—Lake Ontario to the west and the St. Lawrence River to the north—and a history deeply intertwined with the military and industrial narrative of the nation. From its pivotal role as a frontline in the War of 1812 to its development as an industrial hub powered by the Black River, the county has a rich heritage. For genealogists, its records trace the path of ambitious New England pioneers who transformed a wilderness into a landscape of prosperous farms, bustling mills, and strategic military posts.

I. County Formation and Evolution

Jefferson County was created during the rapid westward expansion into central and northern New York in the early 19th century.

  • 1805: County Formed: Jefferson County was established on March 28, 1805.
  • Parent County: It was formed from the western part of Oneida County. All land, probate, and court records for ancestors living in the area prior to 1805 will be found in the records of Oneida County, and for earlier periods, its parent counties of Herkimer and Montgomery.
  • Subsequent Formations: The county’s boundaries have remained relatively stable since its creation.
  • Name Origin: The county was named in honor of Thomas Jefferson, the third President of the United States, who was in office at the time of its formation.
  • County Seat History: The city of Watertown was designated as the county seat in 1805 and has held that role continuously. Its selection was based on its central location and the immense water power potential of the Black River, which runs through its center.

II. Settlement and Early History

  • Early Inhabitants: The land was the traditional territory of the Haudenosaunee (Iroquois) Confederacy, particularly the Onondaga and Oneida nations, who used it for hunting and fishing.
  • Pioneer Settlement and Economy: Following the American Revolution, the region was opened for settlement as part of the massive Macomb’s Purchase land tract. The first permanent American settlers, primarily from New England states like Vermont and Connecticut, arrived around 1799. They were drawn by the promise of cheap, fertile land and established farms and small communities. The powerful Black River was quickly harnessed to power sawmills, gristmills, and later, the large paper mills that made Watertown an industrial center.
  • Key Historical Events:
    • The War of 1812: Due to its proximity to British Canada, Jefferson County was a crucial military and naval theater. The village of Sackets Harbor became the U.S. Navy’s main base of operations on the Great Lakes and the site of two significant battles. Military records from this era are a key resource for local genealogical research.
    • Industrial Hub: In the 19th century, Watertown became a major manufacturing center, known for paper production and the invention of the first portable steam engine. The city’s wealth led to the construction of remarkable Victorian architecture.
    • The Gilded Age: The Thousand Islands region along the St. Lawrence River became a premier summer resort for America’s wealthiest families, who built elaborate estates and “castles,” such as Boldt Castle.
    • Fort Drum: Originally established as Pine Camp in 1908, the installation was vastly expanded during World War II and later renamed Fort Drum. It is now home to the U.S. Army’s 10th Mountain Division and is a dominant economic and cultural force in the county.

III. Genealogical Records and Resources

Research in Jefferson County relies on a combination of county, local, and historical society records. Unlike some states, New York vital records are primarily kept at the local level.

  • County Offices (Watertown, NY):
    • Jefferson County Clerk’s Office: The primary repository for land records (deeds and mortgages) from 1805 and court records (civil and criminal).
    • Jefferson County Surrogate’s Court: Maintains all probate records, including wills, estate administrations, and guardianship papers, from 1805 to the present.
  • Vital Records:
    • Birth, Marriage, and Death Records: Statewide registration in New York began around 1880. For records after 1880, contact the local City or Town Clerk where the event occurred. The New York State Department of Health in Albany also holds copies. For records prior to 1880, researchers must rely on alternative sources such as church registers, cemetery records, newspapers, and family Bibles, as civil registration was non-existent.
  • Libraries and Societies:
    • Roswell P. Flower Memorial Library: Located in Watertown, this library has a premier Genealogy Department for the North Country region, with extensive microfilm holdings of federal and state censuses, local newspapers, and a vast collection of published family histories and local records.
    • Jefferson County Historical Society: A vital resource located in Watertown, offering access to a research library with manuscript collections, family files, photographs, maps, and historical artifacts.
    • Northern New York American-Canadian Genealogical Society: A regional society focused on the unique cross-border heritage of the North Country, invaluable for those with ancestors who moved between New York and Ontario.
  • Bordering Jurisdictions:
    • St. Lawrence County (northeast)
    • Lewis County (southeast)
    • Oswego County (southwest)
    • Province of Ontario, Canada (across Lake Ontario and the St. Lawrence River to the west and north)

Please share any resources you have and will do lookups or links to resources you are aware of. Thanks