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

Explore 147 historic maps of Sonoma 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 Sonoma 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 Sonoma County's history through authentic maps from the 1900s. This is your window into the past.

Sonoma County, CA maps

(147)
  1. 1902 Map of Napa
    1902 Map of Napa
    1902 Napa
    1902 Print · USGS
    The Napa Valley and Carquinez Strait are captured at the turn of the century, showing a landscape defined by maritime military posts and early vineyards. Genealogists and historians can trace the Mare Island Navy Yard, the Insane Asylum, and rail stops at Zinfandel and Rutherford.
    6 unique versions available
  4. 1914 Map of Petaluma
    1914 Map of Petaluma
    1914 Petaluma
    1914 Print · USGS
    The North Bay region near the turn of the century shows a landscape of tidal marshes and rising ridges connected by the Northwestern Pacific. Genealogists and historians can trace old family ranch sites like Freitas Ranch and numerous rural schoolhouses including Iowa School and Burdell School.
    5 unique versions available
  7. 1916 Map of Mare Island
    1916 Map of Mare Island
    1916 Mare Island
    1916 Print · USGS
    The northern San Pablo Bay region comes alive in this survey, showcasing a landscape of tidal marshes and rail-driven growth during the mid-1910s. Researchers can trace the layout of the Mare Island Navy Yard, the remote rail stop at Wingo, and the rural classrooms of Fly School.
    4 unique versions available
  10. 1916 Map of Santa Rosa
    1916 Map of Santa Rosa
    1916 Santa Rosa
    1916 Print · USGS
    Sonoma County in the mid-1910s is a landscape of established rail towns and historic land grants. Researchers can trace early infrastructure through sites like the Sonoma State Home, Adobe Fort, and rural landmarks such as Grangers Hall or the Winery.
    3 unique versions available
  13. 1916 Map of Point Reyes
    1916 Map of Point Reyes
    1916 Point Reyes
    1916 Print · USGS
    Coastal Marin County during the mid-1910s reveals a working landscape of shorefront landings and family ranches. Researchers can trace early settlements and schools like Lairds Landing, Olema, and Franklin School before modern park designations.
    2 unique versions available
  16. 1918 Map of Point Reyes
    1918 Map of Point Reyes
    1918 Point Reyes
    1918 Print · USGS
    Marin County's rugged coast appears here in the years following the turn of the century, showing a working landscape of ranches and rail. Genealogists can locate family landmarks like Lairds Landing, rural schoolhouses, and the Northwestern Pacific line.
    6 unique versions available
  19. 1920 Map of Healdsburg
    1920 Map of Healdsburg
    1920 Healdsburg
    1920 Print · USGS
    The Russian River valley in the early twentieth century was a landscape of expanding viticulture and rail transit. Genealogists and historians can trace the old depots and homesteads from Geyserville to Windsor, finding specific landmarks like the Orphans Home and Olive Hill Cem.
  22. 1921 Map of Skaggs
    1921 Map of Skaggs
    1921 Skaggs
    1921 Print · USGS
    Coastal Sonoma County is captured here in the early twenties, showing a landscape defined by remote mountain ranches and nascent rail towns. Researchers can locate family landmarks like Soules Ranch and Nobles Ranch or trace the N. W. P. R. R. near Guerneville.
  25. 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.
  28. 1921 Map of Plantation
    1921 Map of Plantation
    1921 Plantation
    1921 Print · USGS
    Coastal Sonoma County in the early twenties shows a landscape of remote ranches and maritime landings. Genealogists can locate family landmarks like Ohlson Ranch or Tabers Ranch and trace the old coastal post office at Plantation PO.
  31. 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
  34. 1933 Map of Healdsburg
    1933 Map of Healdsburg
    1933 Healdsburg
    1933 Print · USGS
    Sonoma County's wine and river country comes alive in the early 1930s, showing the early footprints of HEALDSBURG and Geyserville. Researchers can trace the Northwestern Pacific rail line to vanished sidings and schools like Grape Sch and Sotoyome Sch.
  37. 1935 Map of Sebastopol
    1935 Map of Sebastopol
    1935 Sebastopol
    1935 Print · USGS
    The Sonoma County hills and the Gold Ridge fruit district are captured here in the mid-1930s, just as the regional rail network still connected small agricultural hamlets. Genealogists can trace family footprints at Watson Sch, Two Rock Ch, and the rural community of Bloomfield.
  40. 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.
  43. 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
  46. 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.
  49. 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
  52. 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.
  55. 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.
  58. 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
  61. 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
  64. 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
  67. 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.
  70. 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.
  73. 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
Showing maps 1-25 of 147

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Frequently asked questions

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