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

Explore 138 historic maps of Alameda 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 Alameda 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 Alameda County's history through authentic maps from the 1900s. This is your window into the past.

Alameda County, CA maps

(138)
  1. 1902 Map of Santa Cruz
    1902 Map of Santa Cruz
    1902 Santa Cruz
    1902 Print · USGS
    Coastal California at the end of the Victorian era reveals a landscape of redwood forests, early university towns, and remote Pacific outposts. Genealogists and historians can trace the early rail corridors through Boulder Creek and Felton or locate coastal landmarks like Pigeon Point and Halfmoon Bay.
    9 unique versions available
  4. 1906 Map of Pleasanton
    1906 Map of Pleasanton
    1906 Pleasanton
    1906 Print · USGS
    The Livermore and Amador Valleys are captured here at the turn of the century as they transitioned from ranch lands to thriving rail hubs. Genealogists and historians can trace family locations near Mission San Jose, the old Dougherty Post Office, and the junction at Niles.
    5 unique versions available
  7. 1907 Map of Tesla
    1907 Map of Tesla
    1907 Tesla
    1907 Print · USGS
    The industrial corridor of Corral Hollow comes to life in this early 1900s survey of the Alameda and San Joaquin border. Genealogists and historians can trace now-quiet locations like Tesla, Pottery, and the Sweet Springs Halfway House along the winding mountain passes.
    5 unique versions available
  10. 1911 Map of Byron Hot Springs
    1911 Map of Byron Hot Springs
    1911 Byron Hot Springs
    1911 Print · USGS
    Contra Costa County at the beginning of the twentieth century shows a landscape transitioning from ranching to railroad-driven tourism. Historians can trace the footprint of the Byron Hot Springs resort and the early rail infrastructure serving Byron.
  13. 1914 Map of Bethany
    1914 Map of Bethany
    1914 Bethany
    1914 Print · USGS
    The San Joaquin Delta was a maze of engineered waterways and rail lines just before the First World War. Researchers can trace the original routes of the Bethany Ferry and locate early landmarks like Mountain House and the Lammersville School.
    2 unique versions available
  16. 1915 Map of San Mateo
    1915 Map of San Mateo
    1915 San Mateo
    1915 Print · USGS
    The San Francisco Peninsula at the start of the twentieth century shows a landscape transitioning from rural ranchos to industrial centers and suburbs. Genealogists can trace family footprints at Colma, locate the Hoyt School, or follow the Southern Pacific RR through Baden Sta.
    6 unique versions available
  19. 1915 Map of Haywards
    1915 Map of Haywards
    1915 Haywards
    1915 Print · USGS
    The East Bay shoreline and inland foothills are shown here in the mid-1910s during a height of coastal industry. Genealogists and historians can trace old shipping points like Mulford Landing, early salt operations at Union City Salt Works, and the rail lines of the Western Pacific.
    4 unique versions available
  22. 1915 Map of Concord
    1915 Map of Concord
    1915 Concord
    1915 Print · USGS
    Contra Costa and Alameda counties are shown here just before the mid-century population boom, when the East Bay was a landscape of ranchos and rail stops. Genealogists can trace family footprints in small 1910s settlements like Moraga, Pacheco, and Lafayette.
    5 unique versions available
  25. 1915 Map of San Francisco
    1915 Map of San Francisco
    1915 San Francisco
    1915 Print · USGS
    San Francisco and the East Bay appear at a pivotal moment just before the First World War, featuring the grand layout of the Panama-Pacific International Exposition. Genealogists and historians can trace the early rail networks of the Key Route Pier, the industrial waterfront at Winehaven, and historic landmarks like Cliff House.
    6 unique versions available
  28. 1916 Map of Byron Hot Springs
    1916 Map of Byron Hot Springs
    1916 Byron Hot Springs
    1916 Print · USGS
    Eastern Contra Costa County was a landscape of historic land grants and early rail travel in the years before the Great War. Researchers can trace the original Southern Pacific route serving Byron and the specialized resort grounds of Byron Hot Springs.
    2 unique versions available
  31. 1916 Map of Byron
    1916 Map of Byron
    1916 Byron
    1916 Print · USGS
    In the early twentieth century, the Contra Costa and San Joaquin borderlands were a landscape of reclaimed delta tracts and rising hill country. Researchers can trace early railroad alignments and rural life at Byron Hot Sprs, the Bethany Ferry, and the Vasco School.
    3 unique versions available
  34. 1916 Map of Midway
    1916 Map of Midway
    1916 Midway
    1916 Print · USGS
    The rail-and-ranching corridor of the Altamont pass comes to life in the years before the Great War. Genealogists and rail historians can trace the competing tracks of the Southern Pacific and Western Pacific as they converge near Midway.
    3 unique versions available
  37. 1922 Map of Carbona
    1922 Map of Carbona
    1922 Carbona
    1922 Print · USGS
    San Joaquin County at the dawn of the roaring twenties reveals a bustling rail landscape where the Southern Pacific meets the Western Pacific. Genealogists and historians can trace early school districts like New Jerusalem School and find industrial roots at the Buckeye Mines.
    3 unique versions available
  40. 1938 Map of Mt. Boardman, 1957 Print
    1938 Map of Mt. Boardman, 1957 Print
    1938 Mt. Boardman
    1957 Print · USGS
    The Diablo Range backcountry in the late 1930s is revealed here as a landscape of isolated ranching and mining. Researchers can locate family landmarks like Gerber Ranch or trace the early development of the Western Mine and Shanti Ashrama.
    3 unique versions available
  43. 1939 Map of San Mateo, 1956 Print
    1939 Map of San Mateo, 1956 Print
    1939 San Mateo
    1956 Print · USGS
    The San Francisco Peninsula at the brink of the 1940s reveals a landscape of ridge-top vistas and growing railroad towns. Researchers can trace the early layouts of Burlingame, San Bruno, and Millbrae, or locate institutional landmarks like St Josephs Military Academy and the extensive Chinese Cem.
    3 unique versions available
  46. 1940 Map of Byron, 1943 Print
    1940 Map of Byron, 1943 Print
    1940 Byron
    1943 Print · USGS
    The California Delta meets the coastal hills during the early 1940s, showing a transition from the orchards of Brentwood to the intricate waterways of the islands. Researchers can trace historic schools like Iron House Sch, rail stops at Knighten Sta, and the famous Byron Hot Springs.
  49. 1941 Map of Pleasanton
    1941 Map of Pleasanton
    1941 Pleasanton
    1941 Print · USGS
    The Livermore Valley and East Bay hills are captured here in the early 1940s, showing a world of cattle ranchos and railroad towns. You can trace early landmarks like the Mission San Jose de Guadalupe, the Livermore Airport, and several rural one-room schoolhouses like Antone Sch.
  52. 1941 Map of Palo Alto
    1941 Map of Palo Alto
    1941 Palo Alto
    1941 Print · USGS
    The Peninsula and Santa Clara Valley are seen here in the early 1940s, just as the region began its mid-century transformation. Researchers can trace the layout of Stanford University, the military grounds of Moffett Field, and local landmarks like Flood Park.
  55. 1942 Map of Concord
    1942 Map of Concord
    1942 Concord
    1942 Print · USGS
    The East Bay interior was a landscape of expanding valley towns and deep-rooted ranching tracts in the early 1940s. Genealogists and historians can trace rail-era settlements like Concord, Lafayette, and Walnut Creek alongside local landmarks like St Marys College and Sherman Field.
  58. 1942 Map of Mt. Hamilton
    1942 Map of Mt. Hamilton
    1942 Mt. Hamilton
    1942 Print · USGS
    The Diablo Range heights above San Jose appear here in the early 1940s, centered on the high scientific outpost at Lick Observatory. Researchers can trace old mountain roads and family-held land grants such as the Grant Ranch and Evergreen Ranch.
  61. 1942 Map of Carbona
    1942 Map of Carbona
    1942 Carbona
    1942 Print · USGS
    The rail-and-river landscape of the San Joaquin Valley is captured here just as Tracy was expanding into a regional hub. Genealogists and historians can trace the rural school system through New Jerusalem School and find local landmarks like the Brichetto Tomb and Buckeye Mines.
  64. 1942 Map of Mt. Boardman
    1942 Map of Mt. Boardman
    1942 Mt. Boardman
    1942 Print · USGS
    The Diablo Range highlands at the intersection of four counties are captured here in the early 1940s. Genealogists and historians can locate remote family holdings like the Schmidt Ranch and Jordan Ranch or trace the early paths through San Antone Valley.
  67. 1942 Map of Hayward
    1942 Map of Hayward
    1942 Hayward
    1942 Print · USGS
    The East Bay shoreline and inland foothills come alive in the early 1940s as industry and infrastructure reshape the landscape. Researchers can trace the original footprints of Russell City and Mt Eden or locate the historic Oakland Speedway and Fairmont Hospital.
  70. 1942 Map of Altamont, 1964 Print
    1942 Map of Altamont, 1964 Print
    1942 Altamont
    1964 Print · USGS
    Eastern Alameda County at the start of the war shows a landscape of rail sidings and cattle ranching as the valley meets the ridges. Genealogists and historians can trace family locations like Mendenhall Ranch, rural landmarks like Green School, and the steep rail route through Altamont.
  73. 1943 Map of Palo Alto
    1943 Map of Palo Alto
    1943 Palo Alto
    1943 Print · USGS
    The San Francisco Peninsula was still a region of orchards and academic outposts in the years following the Great Depression. Researchers can trace the development of early Silicon Valley through the Southern Pacific line and family landmarks like Duveneck Ranch and the Whisman Dist School.
Showing maps 1-25 of 138

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