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Old Maps of Napa County, California for Metal Detecting

Plan your next treasure hunt with 76 historic maps of Napa County. Find old homesites, ghost towns, trails, and gathering spots that may be lost to time — perfect for identifying promising metal detecting locations.

  • Locate forgotten sites: Uncover places like long-lost settlements, abandoned rail lines, or gathering spots.
  • Plan better hunts: Use map overlays combined with LiDAR or satellite views to narrow in on historically rich areas.
  • Made for detectorists: Thousands of hobbyists use these maps to discover relics, coins, and hidden history.

Use these historic maps to boost your research and find new opportunities beneath the surface of Napa County.

Napa County, CA maps

(76)
  1. 1896 Map of Carquinez Strait, 1954 Print
    1896 Map of Carquinez Strait, 1954 Print
    1896 Carquinez Strait
    1954 Print · USGS
    Covers Napa County, including Concord, Vallejo, and other nearby areas
  4. 1898 Map of Karquines
    1898 Map of Karquines
    1898 Karquines
    1898 Print · USGS
    Covers Napa County, including Concord, Vallejo, and other nearby areas
  7. 1901 Map of Karquines
    1901 Map of Karquines
    1901 Karquines
    1901 Print · USGS
    Covers Napa County, including Concord, Vallejo, and other nearby areas
    6 unique versions available
  10. 1902 Map of Napa
    1902 Map of Napa
    1902 Napa
    1902 Print · USGS
    Covers Napa County, including Concord, Vallejo, and other nearby areas
    6 unique versions available
  13. 1916 Map of Mare Island
    1916 Map of Mare Island
    1916 Mare Island
    1916 Print · USGS
    Covers Napa County, including Vallejo, Richmond, and other nearby areas
    4 unique versions available
  16. 1916 Map of Santa Rosa
    1916 Map of Santa Rosa
    1916 Santa Rosa
    1916 Print · USGS
    Covers Napa County, including Santa Rosa, Petaluma, and other nearby areas
    3 unique versions available
  19. 1921 Map of Mt. Vaca
    1921 Map of Mt. Vaca
    1921 Mt. Vaca
    1921 Print · USGS
    Covers Napa County, including Fairfield, Vacaville, and other nearby areas
  22. 1924 Map of Capay
    1924 Map of Capay
    1924 Capay
    1924 Print · USGS
    Covers Napa County, including Winters, Esparto, and other nearby areas
  25. 1927 Map of Calistoga
    1927 Map of Calistoga
    1927 Calistoga
    1927 Print · USGS
    Covers Napa County, including Santa Rosa, Calistoga, and other nearby areas
    2 unique versions available
  28. 1940 Map of Carquinez Strait, 1963 Print
    1940 Map of Carquinez Strait, 1963 Print
    1940 Carquinez Strait
    1963 Print · USGS
    Covers Napa County, including Concord, Vallejo, and other nearby areas
    2 unique versions available
  31. 1942 Map of Mare Island
    1942 Map of Mare Island
    1942 Mare Island
    1942 Print · USGS
    Covers Napa County, including Vallejo, Richmond, and other nearby areas
  34. 1942 Map of Carquinez
    1942 Map of Carquinez
    1942 Carquinez
    1942 Print · USGS
    Covers Napa County, including Concord, Vallejo, and other nearby areas
  37. 1942 Map of Sonoma
    1942 Map of Sonoma
    1942 Sonoma
    1942 Print · USGS
    Covers Napa County, including Napa, Sonoma, and other nearby areas
  40. 1942 Map of Mt. Vaca
    1942 Map of Mt. Vaca
    1942 Mt. Vaca
    1942 Print · USGS
    Covers Napa County, including Fairfield, Vacaville, and other nearby areas
    2 unique versions available
  43. 1942 Map of St. Helena, 1966 Print
    1942 Map of St. Helena, 1966 Print
    1942 St. Helena
    1966 Print · USGS
    Covers Napa County, including Howell Mountain, Pope Valley, and other nearby areas
  46. 1943 Map of Morgan Valley
    1943 Map of Morgan Valley
    1943 Morgan Valley
    1943 Print · USGS
    Covers Napa County, including Knoxville, Yolo County, and other nearby areas
  49. 1943 Map of Capay, 1945 Print
    1943 Map of Capay, 1945 Print
    1943 Capay
    1945 Print · USGS
    Covers Napa County, including Winters, Esparto, and other nearby areas
  52. 1943 Map of Calistoga, 1955 Print
    1943 Map of Calistoga, 1955 Print
    1943 Calistoga
    1955 Print · USGS
    Covers Napa County, including Santa Rosa, Calistoga, and other nearby areas
  55. 1944 Map of Santa Rosa
    1944 Map of Santa Rosa
    1944 Santa Rosa
    1944 Print · USGS
    Covers Napa County, including Santa Rosa, Petaluma, and other nearby areas
    2 unique versions available
  58. 1944 Map of Morgan Valley
    1944 Map of Morgan Valley
    1944 Morgan Valley
    1944 Print · USGS
    Covers Napa County, including Knoxville, Yolo County, and other nearby areas
    2 unique versions available
  61. 1945 Map of Capay
    1945 Map of Capay
    1945 Capay
    1945 Print · USGS
    Covers Napa County, including Winters, Esparto, and other nearby areas
  64. 1945 Map of Calistoga
    1945 Map of Calistoga
    1945 Calistoga
    1945 Print · USGS
    Covers Napa County, including Santa Rosa, Calistoga, and other nearby areas
    2 unique versions available
  67. 1945 Map of Rumsey
    1945 Map of Rumsey
    1945 Rumsey
    1945 Print · USGS
    Covers Napa County, including Tancred, Guinda, and other nearby areas
    2 unique versions available
  70. 1945 Map of St. Helena
    1945 Map of St. Helena
    1945 St. Helena
    1945 Print · USGS
    Covers Napa County, including Howell Mountain, Pope Valley, and other nearby areas
    2 unique versions available
  73. 1947 Map of Santa Rosa
    1947 Map of Santa Rosa
    1947 Santa Rosa
    1947 Print · USGS
    Covers Napa County, including Santa Rosa, Concord, and other nearby areas
Showing maps 1-25 of 76

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Frequently asked questions

  • What are the different types of historical maps available for Napa County?
  • What is the oldest map of Napa County?
  • Where can I purchase historical maps of Napa County for my home or office?
  • Where can I download high-res historical maps of Napa County?
  • Are there historical topographic maps available for Napa County?
  • Is there historical aerial imagery available for Napa County?
  • Where are historical maps of Napa County sourced from?