Old Maps of Tri Counties, California for Genealogy
Trace your family roots with 13 historic maps of Tri Counties. These high-res maps reveal old neighborhoods, homesites, landmarks, and streets — helping you uncover where your ancestors lived and how the area evolved over time.
- Explore historic neighborhoods: Identify where your relatives may have lived in the 1800s or 1900s.
- Compare maps over time: Trace the changes in streets, buildings, and landmarks for multi-generational research.
- Perfect for genealogy & ancestry research: Used by family historians and researchers to map out lineage and migration.
These maps are an incredible resource for exploring your personal connection to Tri Counties's past.
Tri Counties, CA maps
(13)- 1919 Map of Adelaida
1919 Adelaida1919 Print · USGSSan Luis Obispo County’s interior ridges are mapped here shortly after the Great War, showing a landscape of small ranches and rural schools. Genealogists can trace family connections to landmarks like Adelaida, the German Church, and the Williams Ranch.2 unique versions available - 1932 Map of Adelaida
1932 Adelaida1932 Print · USGSSan Luis Obispo County’s interior highlands appear here between the world wars, showing a landscape of remote mountain ranches and creek-side settlements. Genealogists can trace early homesteads near the German Church or locate rural schoolhouses like Lincoln School and Asuncion School.2 unique versions available - 1942 Map of Adelaida
1942 Adelaida1942 Print · USGSThe Santa Lucia Range was still a rugged frontier of ranching and quicksilver mining in the early 1940s. Genealogists can trace family holdings like Kentucky Ranch and old rural schoolhouses including Summit School and Asuncion School. - 1947 Map of San Luis Obispo, 1948 Print
1947 San Luis Obispo1948 Print · USGSCoastal California at the dawn of the Cold War reveals a landscape of massive military reservations and quiet seaside towns. Genealogists and researchers can trace the Southern Pacific rail line, old mining sites like Los Burros Mine, and local landmarks from Point Buchon to the Carrizo Plain. - 1947 Map of Adelaida, 1957 Print
1947 Adelaida1957 Print · USGSThe Santa Lucia Range of San Luis Obispo County was a landscape of remote mines and scattered ranching communities shortly after the war. Local historians can trace early community hubs like Adelaida, the Klau Mine, and several rural schoolhouses such as Lincoln Sch.2 unique versions available - 1948 Map of San Luis Obispo
1948 San Luis Obispo1948 Print · USGSCentral Coast life in the late 1940s is centered on the Southern Pacific rail line and expanding military bases. Genealogists can trace early rural life through Union School and local operations like the Klau Mine or Buena Vista Mine. - 1948 Map of Lime Mountain, 1952 Print
1948 Lime Mountain1952 Print · USGSThe San Luis Obispo backcountry in the late 1940s is defined here by the steep terrain of the Santa Lucia Range. Researchers can trace the winding Nacimiento River and locate remote outposts like Camp Natoma and the settlement of Klau.4 unique versions available - 1956 Map of San Luis Obispo, 1963 Print
1956 San Luis Obispo1963 Print · USGSCentral California coastal and valley life unfolds in the mid-fifties, from the shoreline of Pismo Beach to the arid Carrizo Plain. Trace early travel routes along the Southern Pacific RR or locate family sites near the Templeton Cemetery and Paso Robles County Cemetery.5 unique versions available - 1957 Map of San Luis Obispo
1957 San Luis Obispo1957 Print · USGSCoastal California in the late fifties is defined by the steep Santa Lucia Range and the rail-connected hub of San Luis Obispo. Genealogists and researchers can trace rural life via Union School, the Southern Pacific line, and old sites like the Polar Star Mine. - 1958 Map of San Luis Obispo
1958 San Luis Obispo1958 Print · USGSThe Central Coast in the late fifties reveals a landscape of ranching and early tourism before the massive expansion of the modern era. Trace the path of the Southern Pacific through Atascadero or locate family roots in coastal towns like Cayucos and Cambria. - 1961 Map of Adelaida, 1968 Print
1961 Adelaida1968 Print · USGSCoastal California ranching and mining culture are preserved here in the early sixties as the Nacimiento Reservoir area developed. Researchers can locate local landmarks like the Adelaida Sch, the Klau Mine, and several historic family holdings including Kentucky Ranch. - 1989 Map of Paso Robles
1989 Paso Robles1989 Print · USGSCoastal mountains and the Salinas River valley meet in the late eighties as this region balances military installations and agriculture. Genealogists and historians can trace the Southern Pacific line through Paso Robles and Templeton or locate the Klau Mine and San Miguel. - 2021 Map of Lime Mountain, 2021 Print
2021 Lime Mountain2021 Print · USGSThe rugged Santa Lucia foothills and the winding shores of the reservoir define this area in the early 2020s. Researchers can trace the layout of the Klau settlement and the complex drainages of Las Tablas Cr and Franklin Cr.
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