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1900s (20th Century) Maps of Lake County, California

Explore 144 historic maps of Lake County from the 1900s (20th Century). These maps offer a rare glimpse into what life looked like during the 1900s — 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 Lake County's landscape evolved across the 1900s, 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 1900s, 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 Lake County's history through authentic maps from the 1900s. This is your window into the past.

Lake County, CA maps

(144)
  1. 1919 Map of Elk Creek, 1939 Print
    1919 Map of Elk Creek, 1939 Print
    1919 Elk Creek
    1939 Print · USGS
    Glenn County ranching and forest lands are shown here just after the Great War, when pack trails still connected remote mountain outposts. Trace the early routes to Oriental, Ivory Mill, and the settlement at Elk Creek.
  4. 1920 Map of Venado
    1920 Map of Venado
    1920 Venado
    1920 Print · USGS
    Colusa County mineral springs and mountain passes are captured here during the years following the Great War. Researchers can trace the path of the Colusa & Lake R.R. (Abandoned) and locate historic mining sites like the Abbott Mercury Mine and Wilbur Springs.
  7. 1920 Map of Ukiah
    1920 Map of Ukiah
    1920 Ukiah
    1920 Print · USGS
    Mendocino County life centers on the Russian River valley during the years following the first World War. Family historians can locate specific homesteads like Roderis Ranch and trace rail operations at El Roble Siding or Clemhurst Spur.
  10. 1921 Map of Kelseyville
    1921 Map of Kelseyville
    1921 Kelseyville
    1921 Print · USGS
    Northern California's thermal springs and mining districts are in full view in this early twentieth-century survey of Lake and Sonoma counties. Researchers can trace historic ranch boundaries like Moulton Ranch or locate vanished operations at the Cloverdale Quicksilver Mine and the Geyser Hotel.
  13. 1922 Map of Hullville
    1922 Map of Hullville
    1922 Hullville
    1922 Print · USGS
    The pre-reservoir wilderness of Lake County is captured in this 1916 survey, shortly before the valley was flooded. Genealogists and historians can trace early homesteads and camps like Hullville, Boardman Camp, and Masons along the South Fork Eel River.
  16. 1924 Map of Bartlett Springs
    1924 Map of Bartlett Springs
    1924 Bartlett Springs
    1924 Print · USGS
    Northern Lake County mineral springs and canyons are captured here in the years following the Great War. Genealogists and historians can trace the early resort era at Bartlett Springs, Allen Springs, and the waters of Clear Lake.
  19. 1927 Map of Calistoga
    1927 Map of Calistoga
    1927 Calistoga
    1927 Print · USGS
    Upper Napa Valley and the surrounding peaks come alive in this 1920s tactical survey. Genealogists and researchers can trace the early mercury industry at the Oat Hill Mine, locate family roots near Langstry Ranch, or follow the old Southern Pacific line through Larkmead and Bale.
    2 unique versions available
  22. 1929 Map of Eden Valley
    1929 Map of Eden Valley
    1929 Eden Valley
    1929 Print · USGS
    Mendocino County’s interior wilderness is captured in the late 1920s, showing a landscape defined by the Eel River and remote mountain camps. Researchers can locate early family-named outposts like Crocker Place and trace the historic Mendenhall Trail through the high country.
    2 unique versions available
  25. 1938 Map of Lakeport
    1938 Map of Lakeport
    1938 Lakeport
    1938 Print · USGS
    Lake County in the late thirties is captured here at a peak of lakeside development and rural industry. Genealogists and historians can trace family-named sites like Jones Ranch and Mission Rancheria, or locate old schoolhouses like Westlake Sch and Glen Eden Sch.
    3 unique versions available
  28. 1938 Map of Hopland
    1938 Map of Hopland
    1938 Hopland
    1938 Print · USGS
    Northern California’s Russian River valley is captured here in the 1920s, showing the early rail-and-road network between Hopland and Cloverdale. Trace old rail stops like Thorn Siding and historic locations such as Duncan Springs and Preston.
  31. 1942 Map of Bartlett Springs
    1942 Map of Bartlett Springs
    1942 Bartlett Springs
    1942 Print · USGS
    Lake County and the rugged North Coast Ranges are captured here in the early 1940s, balancing resort springs with hardscrabble ranching. Genealogists can locate family landmarks like Garner Ranch, the East Lake Sch, and the isolated Bartlett Springs resort.
  34. 1942 Map of St. Helena, 1966 Print
    1942 Map of St. Helena, 1966 Print
    1942 St. Helena
    1966 Print · USGS
    Napa County during the early 1940s is defined by its rural school districts and the emerging institutional centers of the Howell Mountain area. Genealogists can trace family footprints through the Silverado Trail, the Aetna Mine, and small schools like Hardin Sch.
  37. 1943 Map of Morgan Valley
    1943 Map of Morgan Valley
    1943 Morgan Valley
    1943 Print · USGS
    Northern California ranching and mining country are captured in the early 1940s at the junction of Lake, Napa, and Yolo counties. Researchers can locate the Morgan Valley Sch and several mines like the Harrison Mine and Red Elephant Mine.
  40. 1943 Map of Pomo, 1954 Print
    1943 Map of Pomo, 1954 Print
    1943 Pomo
    1954 Print · USGS
    Mendocino County's ranching and irrigation landscapes are captured here during the 1940s, showcasing the development of Potter Valley. Genealogists and historians can locate family lands like Mewhinney Ranch alongside the Pomo Indian Reservation and the Emandale Resort.
  43. 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.
  46. 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.
  49. 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.
  52. 1944 Map of Bartlett Springs
    1944 Map of Bartlett Springs
    1944 Bartlett Springs
    1944 Print · USGS
    Lake County at the height of the war years reveals a landscape of isolated springs and family-run ranches nestled along the high ridges. Researchers can trace historic homesteads like the Garner Ranch, the site of Bartlett Springs, and the East Lake Sch near the Clear Lake shoreline.
    2 unique versions available
  55. 1944 Map of Ukiah
    1944 Map of Ukiah
    1944 Ukiah
    1944 Print · USGS
    The Russian River valley in the mid-1940s is a landscape of established ranching, tribal lands, and the vital Northwestern Pacific rail line. Researchers can locate family landmarks like Bartlett Ranch, the McNear School, and several tribal areas including Ukiah Rancheria.
  58. 1944 Map of Wilbur Springs
    1944 Map of Wilbur Springs
    1944 Wilbur Springs
    1944 Print · USGS
    Northern California mining country comes to life in this mid-forties survey of the Coast Ranges. Researchers can trace the quicksilver industry through sites like Abbott Mine and locate rural family history at Leesville or the Huffmaster Ranch.
    3 unique versions available
  61. 1944 Map of Morgan Valley
    1944 Map of Morgan Valley
    1944 Morgan Valley
    1944 Print · USGS
    Upper California ranching and mercury mining country are shown here in the mid-1940s near the corner of Lake, Colusa, and Napa counties. Researchers can trace historic operations like Reid Mine, the old Morgan Valley Sch, and local hubs like Knoxville.
    2 unique versions available
  64. 1944 Map of Hopland
    1944 Map of Hopland
    1944 Hopland
    1944 Print · USGS
    The Russian River valley in the 1940s was a landscape of remote ranches and rail sidings on the Mendocino-Sonoma border. Researchers can trace the Northwestern Pacific Railroad through Pieta, find the old McDonald School, or locate the Nacomis Indian Rancheria.
  67. 1945 Map of Calistoga
    1945 Map of Calistoga
    1945 Calistoga
    1945 Print · USGS
    Calistoga and the surrounding tri-county ridges are documented here during the mid-forties, capturing a landscape defined by mercury and silver mining. Researchers can trace the Southern Pacific RR and locate rural landmarks like the Silverado Mine or Mark West Springs.
    2 unique versions available
  70. 1945 Map of St. Helena
    1945 Map of St. Helena
    1945 St. Helena
    1945 Print · USGS
    Napa County at the end of the war shows a landscape of growing valley towns, mountain colleges, and rural mining outposts. Researchers can trace the path of the Southern Pacific RR or locate family roots near Central Sch and the Aetna Mine.
    2 unique versions available
  73. 1945 Map of Lower Lake
    1945 Map of Lower Lake
    1945 Lower Lake
    1945 Print · USGS
    Lake County's famous resort and mercury-mining districts are shown in high detail during the mid-1940s. Researchers can locate vanished structures at Hould Gibson Camp, trace the namesake springs at Anderson Springs, and find rural institutions like Cobb Valley Sch.
    2 unique versions available
Showing maps 1-25 of 144

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Frequently asked questions

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