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1940s Maps of Sonoma County, California

Explore 39 historic maps of Sonoma 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 Sonoma 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 Sonoma County's history through authentic maps from the 1940s. This is your window into the past.

Sonoma County, CA maps

(39)
  1. 1940 Map of Healdsburg
    1940 Map of Healdsburg
    1940 Healdsburg
    1940 Print · USGS
    Sonoma County's wine and timber country is captured here just before the mid-century, following the winding Russian River through thriving valley towns. Genealogists can locate family-named landmarks and rural schoolhouses like Guilford Sch, Lytton Sch, and the Oak Mound Cem.
    3 unique versions available
  4. 1942 Map of Mare Island
    1942 Map of Mare Island
    1942 Mare Island
    1942 Print · USGS
    The northern reaches of San Pablo Bay come alive in this wartime survey, showing a landscape of vital naval yards and marshland agriculture. Genealogists and historians can trace rail depots like Napa Junction, rural landmarks like American Canyon School, and the industrial waterfronts of Vallejo and Oleum.
  7. 1942 Map of Sebastopol
    1942 Map of Sebastopol
    1942 Sebastopol
    1942 Print · USGS
    Western Sonoma County comes into focus in the early 1940s, showing a landscape defined by apple orchards and redwood groves. Genealogists can trace family footprints through rural sites like Gold Ridge Sch, the Northwestern Pacific RR line, and Bohemian Grove.
    3 unique versions available
  10. 1942 Map of Sonoma
    1942 Map of Sonoma
    1942 Sonoma
    1942 Print · USGS
    The Napa and Sonoma valleys are captured here during the early 1940s, showing the established rail and agricultural networks of the North Bay. Researchers can trace historic landmarks like the Veterans Home, the Quick Silver Mine, and early vineyard sites at Zinfandel and Rutherford.
  13. 1942 Map of Petaluma
    1942 Map of Petaluma
    1942 Petaluma
    1942 Print · USGS
    The Marin and Sonoma county line runs through this early 1940s landscape of tidal marshes and ranch lands. Genealogists can trace family names at Mt Oliver Cemetery or find historic rural institutions like the Olompali School and St Vincent Station.
  16. 1942 Map of Bodega Head, 1956 Print
    1942 Map of Bodega Head, 1956 Print
    1942 Bodega Head
    1956 Print · USGS
    The Sonoma coast during the early 1940s reveals a landscape of sheltered harbors and high coastal ridges. Genealogists and historians can trace the foundations of Bodega Bay, locate the Ocean View Sch, and explore landmarks from Arched Rock Beach to Swallow City.
    3 unique versions available
  19. 1942 Map of Arched Rock, 1956 Print
    1942 Map of Arched Rock, 1956 Print
    1942 Arched Rock
    1956 Print · USGS
    The Sonoma coast at the start of the 1940s reveals a wild landscape of deep gulches and rocky outcroppings. Researchers can trace the rugged shoreline from Arched Rock to the Russian River and explore the hills surrounding Little Black Mountain.
    3 unique versions available
  22. 1943 Map of Point Arena
    1943 Map of Point Arena
    1943 Point Arena
    1943 Print · USGS
    The Mendocino coast in the early 1940s reveals a landscape of isolated ranching and seafaring communities. Genealogists and local historians can trace family holdings from the Iverson Indian Rancheria to the Bourns Family Cem and the Seaside School.
    2 unique versions available
  25. 1943 Map of Tombs Creek
    1943 Map of Tombs Creek
    1943 Tombs Creek
    1943 Print · USGS
    Sonoma County ranching and timber lands are documented here during the mid-1940s. Genealogists and historians can trace family properties like Wickersham Ranch and Lee Nobles Ranch across ridges such as Sheep Repose Ridge.
  28. 1943 Map of Calistoga, 1955 Print
    1943 Map of Calistoga, 1955 Print
    1943 Calistoga
    1955 Print · USGS
    Upper Napa Valley and the rugged Lake County border are captured here during the 1940s, a period defined by mercury mining and early tourism. Researchers can trace family-named landmarks and industrial sites like the Oat Hill Mine, Mark West Springs, and the Petrified Forest.
  31. 1943 Map of Stewarts Point, 1956 Print
    1943 Map of Stewarts Point, 1956 Print
    1943 Stewarts Point
    1956 Print · USGS
    Coastal Sonoma County appears here during the mid-1940s, highlighting a landscape of steep ridges and maritime landings. Researchers can trace old coastal settlements like Stewarts Point and Del Mar Landing or explore the rugged inland valleys of the Wheatfield Fork Gualala River.
    3 unique versions available
  34. 1943 Map of Plantation, 1956 Print
    1943 Map of Plantation, 1956 Print
    1943 Plantation
    1956 Print · USGS
    The Sonoma coast during the early 1940s reveals a network of small schoolhouses and landings before significant modern development. Genealogists can locate family-named landmarks and rural hubs like Plantation, Stillwater Cove Sch, and Walsh Landing.
    3 unique versions available
  37. 1943 Map of Cazadero, 1956 Print
    1943 Map of Cazadero, 1956 Print
    1943 Cazadero
    1956 Print · USGS
    The Sonoma County redwoods and canyon ranchlands are captured here during the early 1940s. Local researchers can trace family holdings like Luttrell Ranch and Doelger Ranch or locate the rural Montgomery Sch and Cazadero post office.
    3 unique versions available
  40. 1943 Map of Annapolis, 1956 Print
    1943 Map of Annapolis, 1956 Print
    1943 Annapolis
    1956 Print · USGS
    Coastal Sonoma County ranching and rural life are preserved here just before the mid-century, centered on the settlement of Annapolis. Genealogists and historians can trace family holdings like Evans Ranch or locate the Horicon Sch and the Stewarts Point Rancheria.
    2 unique versions available
  43. 1943 Map of Duncans Mills, 1956 Print
    1943 Map of Duncans Mills, 1956 Print
    1943 Duncans Mills
    1956 Print · USGS
    The Russian River canyon meets the Pacific in the 1940s, showing a landscape of riverside camps and coastal ranches. Trace the locations of Ocean View Sch, the settlement at Jenner, and the historic Duncans Mills river bend.
    2 unique versions available
  46. 1943 Map of Skaggs Springs, 1956 Print
    1943 Map of Skaggs Springs, 1956 Print
    1943 Skaggs Springs
    1956 Print · USGS
    Sonoma County's backcountry appears here in the early 1940s, showing a network of ranchlands and remote springs before later water projects changed the landscape. Genealogists and hikers can trace old family holdings like Baxter Ranch and Wallers or locate Skaggs Springs and the heights of Bummer Pk.
  49. 1943 Map of Fort Ross, 1958 Print
    1943 Map of Fort Ross, 1958 Print
    1943 Fort Ross
    1958 Print · USGS
    Coastal Sonoma County is captured during the early 1940s, showing the ridge-top ranches and early mining sites overlooking the Pacific. Family historians can trace holdings like Seafeldt Ranch, find the Creighton Ridge Sch, and locate the Layton Mine.
    2 unique versions available
  52. 1943 Map of Kelseyville, 1959 Print
    1943 Map of Kelseyville, 1959 Print
    1943 Kelseyville
    1959 Print · USGS
    In the early 1940s, this region of Lake and Sonoma counties was a mosaic of active ranching and mountain retreats. Researchers can trace family-named lands like Fifield Ranch, locate the Socrates Mine, or find the historic Geyser Resort and Mountain School.
  55. 1943 Map of Hopland, 1960 Print
    1943 Map of Hopland, 1960 Print
    1943 Hopland
    1960 Print · USGS
    Mendocino County ranching and the Russian River valley are captured here in the early 1940s as the rail and road networks matured. Researchers can trace family-named lands like McDowell Ranch, the Nacomis Indian Rancheria, and the operations at Thorn Siding.
  58. 1943 Map of Ornbaun, 1961 Print
    1943 Map of Ornbaun, 1961 Print
    1943 Ornbaun
    1961 Print · USGS
    Northern California ranching and early resort history are documented here in the early 1940s along the Mendocino-Sonoma border. Genealogists can trace family holdings like Zeni Ranch and Rickard Ranch or locate the site of the Old Ornbaun Hot Springs.
  61. 1944 Map of Santa Rosa
    1944 Map of Santa Rosa
    1944 Santa Rosa
    1944 Print · USGS
    Sonoma County transitions from its early land-grant heritage to a mid-century agricultural hub in the years following the 1942 revision. Genealogists and researchers can locate numerous country schools and family-linked landmarks like Sonoma State Home, Adobe Fort, and Grange Hall.
    2 unique versions available
  64. 1944 Map of Fort Ross
    1944 Map of Fort Ross
    1944 Fort Ross
    1944 Print · USGS
    Coastal Sonoma County appears at the height of the Second World War, showing the transition from frontier industry to historic preservation. Genealogists and historians can locate family landmarks like Seafeldt Ranch, the Seaview Cem, and the Murphy Mill (Abandoned).
    2 unique versions available
  67. 1944 Map of Annapolis
    1944 Map of Annapolis
    1944 Annapolis
    1944 Print · USGS
    Northwestern Sonoma County ranching and timber lands are detailed in the 1940s, highlighting the Gualala River forks. Genealogists can trace family holdings like Noble Ranch or Taber Ranch and find local landmarks such as Horicon Sch.
    2 unique versions available
  70. 1944 Map of Plantation
    1944 Map of Plantation
    1944 Plantation
    1944 Print · USGS
    The Sonoma coast in the mid-1940s was a landscape of remote schoolhouses and small maritime landings. Researchers can trace rural life at Plantation and Ocean Cove or locate family-named landmarks like Phillips and the Fort Ross Sch.
    2 unique versions available
  73. 1944 Map of Bodega Head
    1944 Map of Bodega Head
    1944 Bodega Head
    1944 Print · USGS
    The Sonoma coast at the height of the Second World War shows a landscape of quiet harbors and remote coastal gulches. Researchers can trace the layout of Bodega Bay, locate the Ocean View Sch, and explore the terrain around Mount Roscoe and Swallow City.
    3 unique versions available
Showing maps 1-25 of 39

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Frequently asked questions

  • What are the different types of historical maps available for Sonoma County?
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