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1940s Maps of Jefferson County, New York

Explore 47 historic maps of Jefferson County from the 1940s. These maps offer a rare glimpse into what life looked like during the 1940s — showing old roads, neighborhoods, homes, and landmarks that have changed or disappeared over time.

Whether you're researching your family's past, planning a metal detecting trip, or studying how Jefferson County's landscape evolved across the 1940s, these high-resolution maps are a powerful tool for exploring the history of this region.

  • Focus on a specific era: All maps on this page are from the 1940s, giving you a focused view of this time period.
  • See what’s changed: Compare century-old streets, trails, and buildings to today's modern landscape using overlays and satellite layers.
  • Research with precision: Use these maps for genealogy, historical research, land use analysis, or educational projects.
  • View, download, or print: Maps are fully viewable online in high resolution, and can be downloaded or printed for your own records.

Start exploring Jefferson County's history through authentic maps from the 1940s. This is your window into the past.

Jefferson County, NY maps

(47)
  1. 1942 Map of Stony Point
    1942 Map of Stony Point
    1942 Stony Point
    1942 Print · USGS
    The Jefferson County shoreline of Lake Ontario is captured here during the early years of World War II. Researchers can locate the Stony Point Light House and the extensive Stony Point Rifle Range along the coast of Henderson.
  4. 1942 Map of Cape Vincent North
    1942 Map of Cape Vincent North
    1942 Cape Vincent North
    1942 Print · USGS
    The international border along the Thousand Islands comes into sharp focus during the early 1940s. Genealogists and local historians can trace rural landmarks like Riverside Cem, School No 13, and the grounds of Burnham Pt State Park.
  7. 1942 Map of Henderson Bay
    1942 Map of Henderson Bay
    1942 Henderson Bay
    1942 Print · USGS
    Jefferson County’s shoreline comes alive in the early 1940s, highlighting the military presence at the historic Madison Barracks. Researchers can trace old lakeside schoolhouses and family cemeteries like Stone Cem or explore the waterfront detail near Sackets Harbor.
  10. 1942 Map of Chaumont
    1942 Map of Chaumont
    1942 Chaumont
    1942 Print · USGS
    Lake Ontario's northern shores are captured in the early 1940s, showing the vital rail-and-water connections of Jefferson County. Genealogists and local historians can trace family sites like Harris Cem, local landmarks such as Wells School, and the villages of Three Mile Bay and Chaumont.
  13. 1942 Map of Galloo Island
    1942 Map of Galloo Island
    1942 Galloo Island
    1942 Print · USGS
    Isolated in eastern Lake Ontario during the early 1940s, this island survey reveals a landscape dedicated to maritime safety and navigation. Researchers can trace the layout of the Galloo Island L H, the Coast Guard Sta, and activity at Gill Harbor.
  16. 1942 Map of Sawmill Bay
    1942 Map of Sawmill Bay
    1942 Sawmill Bay
    1942 Print · USGS
    The Thousand Islands region along the New York-Ontario border is captured here during the early 1940s. Researchers can trace the rural landscape of Jefferson County through sites like Sand Bay Cem, the Wolfe Island L H, and local schoolhouses like School No 19.
  19. 1942 Map of Cape Vincent South
    1942 Map of Cape Vincent South
    1942 Cape Vincent South
    1942 Print · USGS
    Coastal Jefferson County comes alive in this wartime survey of the waterfront where the St. Lawrence meets Lake Ontario. Genealogists can trace rural family life through a dozen numbered schoolhouses and explore landforms like Grenadier Island and the Long Carrying Place.
    2 unique versions available
  22. 1942 Map of Point Peninsula
    1942 Map of Point Peninsula
    1942 Point Peninsula
    1942 Print · USGS
    Jefferson County shorelines were a landscape of military readiness and isolated lake outposts during the Second World War. Researchers can trace the boundaries of the U S Military Res, find family landmarks like Cooper, and locate the Stony Point Rifle Range.
  25. 1942 Map of Clayton, 1957 Print
    1942 Map of Clayton, 1957 Print
    1942 Clayton
    1957 Print · USGS
    The Thousand Islands region appears at a mid-century peak in this survey of the riverfront and agricultural interior. Local historians can trace the foundations of the community through its many numbered rural schools and family burial sites like Corbin Cem and Dutch Cem.
  28. 1942 Map of Sandy Creek, 1957 Print
    1942 Map of Sandy Creek, 1957 Print
    1942 Sandy Creek
    1957 Print · USGS
    Jefferson and Oswego Counties are shown during the early 1940s, when the New York Central rail line linked thriving rural hamlets. Family historians can locate several numbered schoolhouses and burial sites like Brewster Cem and Wesleyan Cem.
  31. 1942 Map of Copenhagen, 1960 Print
    1942 Map of Copenhagen, 1960 Print
    1942 Copenhagen
    1960 Print · USGS
    Upper New York state is mapped here during the early war years, showing a landscape of small river towns and upland dairy farms. Genealogists can trace family names at Hillside Cem and locate numerous one-room schoolhouses like School No 10.
    2 unique versions available
  34. 1943 Map of Henderson
    1943 Map of Henderson
    1943 Henderson
    1943 Print · USGS
    Jefferson County’s eastern Lake Ontario shoreline is shown here during the war years, capturing the rural community before modern coastal development. Genealogists can trace family names across a landscape dotted with sites like Carpenter Cem, Bishop Street, and Henderson Harbor.
  37. 1943 Map of Boylston
    1943 Map of Boylston
    1943 Boylston
    1943 Print · USGS
    Upper Oswego County is captured here in the 1940s, showing the rural communities of the Tug Hill plateau before mid-century changes. Researchers can locate numerous one-room schoolhouses, the Littlejohn State Game Refuge, and hamlets like Smartville and Winona.
  40. 1943 Map of Sackets Harbor
    1943 Map of Sackets Harbor
    1943 Sackets Harbor
    1943 Print · USGS
    Sackets Harbor and its military waterfront are captured in the early 1940s during a period of active defense and local growth. Genealogists can trace family names through rural junctions like Baggs Corners and identify several rural schoolhouses or the Muskalonge Cem.
  43. 1943 Map of Dexter
    1943 Map of Dexter
    1943 Dexter
    1943 Print · USGS
    Jefferson County life in the early 1940s is centered on the riverfront industry and rail connections of the lake plain. Genealogists can locate family burial grounds like Freeman Cem and identify numerous rural schoolhouses including School No 16 and School No 8.
  46. 1943 Map of Thousand Island Park
    1943 Map of Thousand Island Park
    1943 Thousand Island Park
    1943 Print · USGS
    The Thousand Islands region along the New York-Ontario border is captured here during the 1940s, showing the intricate island communities of the St. Lawrence River. Trace local history through landmark schools like Spicer Bay Sch and the distinct landings of Grindstone Island.
  49. 1943 Map of Barnes Corners
    1943 Map of Barnes Corners
    1943 Barnes Corners
    1943 Print · USGS
    The Tug Hill plateau comes alive in the mid-1940s, showcasing a landscape defined by deep ravines and small upland hamlets. Genealogists can trace family roots through numerous schoolhouses and distinct crossroads like 7x9 Corners, Barnes Corners, and Cronk Corners.
    2 unique versions available
  52. 1943 Map of Watertown
    1943 Map of Watertown
    1943 Watertown
    1943 Print · USGS
    Jefferson County during the early 1940s reveals a landscape defined by the manufacturing hubs of Watertown and the rural schools of the surrounding townships. Researchers can trace local lineages through detailed labels for Fields Settlement Cem, Talcott Corners, and the County Boys School.
  55. 1943 Map of Copenhagen
    1943 Map of Copenhagen
    1943 Copenhagen
    1943 Print · USGS
    The rural uplands of Lewis and Jefferson Counties come into focus during the early 1940s as agricultural life centered around the Deer River. Researchers can locate numerous numbered schoolhouses, the village of Copenhagen, and local landmarks like Pleasant Lake and High Falls.
  58. 1943 Map of Redwood
    1943 Map of Redwood
    1943 Redwood
    1943 Print · USGS
    Jefferson County was defined by its lakeside settlements and heavy rail traffic during the early 1940s. Genealogists can trace family lines through the Barnes Cem and numerous rural schoolhouses like School No 14 or locate the village of Plessis.
  61. 1943 Map of Clayton
    1943 Map of Clayton
    1943 Clayton
    1943 Print · USGS
    The Thousand Islands region and the St. Lawrence riverfront are captured here in the early 1940s. Genealogists and local historians can trace the rural school system and family burial grounds, including School No 2, Dutch Cem, and the village of Depauville.
  64. 1943 Map of Lafargeville
    1943 Map of Lafargeville
    1943 Lafargeville
    1943 Print · USGS
    Jefferson County was still a landscape of scattered rural schools and rail-fed hamlets during the early years of World War II. Researchers can trace ancestral locations through several family-named burial grounds like Hinman Cem and the rail corridors of the New York Central.
  67. 1943 Map of Adams
    1943 Map of Adams
    1943 Adams
    1943 Print · USGS
    Jefferson County's rural heartland is documented here during the early 1940s, showing a landscape defined by small settlements and the Central New York rail line. Researchers can trace ancestral locations at Taylor Settlement, School No 5, and Elmwood Cem.
  70. 1943 Map of Brownville
    1943 Map of Brownville
    1943 Brownville
    1943 Print · USGS
    Jefferson County during the mid-forties remains a landscape of traditional rural districts and small hamlets connected by the New York Central line. Researchers can trace the layout of early school districts and secluded burial sites like Taylor Cem or Sandy Loam Cem.
  73. 1943 Map of Ellisburg
    1943 Map of Ellisburg
    1943 Ellisburg
    1943 Print · USGS
    The eastern shore of Lake Ontario is captured here during the Second World War, showing the intricate barrier pond system of Jefferson County. Genealogists and local historians can locate early rural landmarks like Goodenough Ch, Sandy Pond Corners, and several numbered schoolhouses including School No 11.
Showing maps 1-25 of 47

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Frequently asked questions

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