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Historical Markers in Los Alamos
Santa Barbara is the county seat for Santa Barbara County
Los Alamos is in Santa Barbara County
Santa Barbara County (185) ► ADJACENT TO SANTA BARBARA COUNTY San Luis Obispo County (141) ►
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| On Bell Street (California Route 135) east of Saint Joseph Street, on the right when traveling east. |
| On Bell Street (State Highway 135) east of Centennial Street, on the right when traveling east. |
| Near Bell Street (California Route 135) west of Centennial Street, on the left when traveling west. |
Nov. 13, 2026