1900s (20th Century) Maps of Tri Counties, California
Explore 12 historic maps of Tri Counties 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 Tri Counties'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 Tri Counties's history through authentic maps from the 1900s. This is your window into the past.
Tri Counties, CA maps
(12)- 1919 Map of Adelaida
1919 Adelaida1919 Print · USGSCovers Tri Counties, including Running Deer Ranch, Lake Nacimiento, and other nearby areas2 unique versions available - 1932 Map of Adelaida
1932 Adelaida1932 Print · USGSCovers Tri Counties, including Running Deer Ranch, Lake Nacimiento, and other nearby areas2 unique versions available - 1942 Map of Adelaida
1942 Adelaida1942 Print · USGSCovers Tri Counties, including Running Deer Ranch, Lake Nacimiento, and other nearby areas - 1947 Map of San Luis Obispo, 1948 Print
1947 San Luis Obispo1948 Print · USGSCovers Tri Counties, including San Luis Obispo, Atascadero, and other nearby areas - 1947 Map of Adelaida, 1957 Print
1947 Adelaida1957 Print · USGSCovers Tri Counties, including Running Deer Ranch, Lake Nacimiento, and other nearby areas2 unique versions available - 1948 Map of San Luis Obispo
1948 San Luis Obispo1948 Print · USGSCovers Tri Counties, including San Luis Obispo, Atascadero, and other nearby areas - 1948 Map of Lime Mountain, 1952 Print
1948 Lime Mountain1952 Print · USGSCovers Tri Counties, including Running Deer Ranch, Lake Nacimiento, and other nearby areas4 unique versions available - 1956 Map of San Luis Obispo, 1963 Print
1956 San Luis Obispo1963 Print · USGSCovers Tri Counties, including San Luis Obispo, Atascadero, and other nearby areas5 unique versions available - 1957 Map of San Luis Obispo
1957 San Luis Obispo1957 Print · USGSCovers Tri Counties, including San Luis Obispo, Atascadero, and other nearby areas - 1958 Map of San Luis Obispo
1958 San Luis Obispo1958 Print · USGSCovers Tri Counties, including San Luis Obispo, Atascadero, and other nearby areas - 1961 Map of Adelaida, 1968 Print
1961 Adelaida1968 Print · USGSCovers Tri Counties, including Running Deer Ranch, Lake Nacimiento, and other nearby areas - 1989 Map of Paso Robles
1989 Paso Robles1989 Print · USGSCovers Tri Counties, including Atascadero, Paso Robles, and other nearby areas
End of results
Showing maps 1-12 of 12
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Frequently asked questions
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- Where are historical maps of Tri Counties sourced from?