1900s (20th Century) Maps of Diamond Bar, California
Explore 30 historic maps of Diamond Bar 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 Diamond Bar'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 Diamond Bar's history through authentic maps from the 1900s. This is your window into the past.
Diamond Bar, CA maps
(30)- 1901 Map of Southern California Sheet No. 1
1901 Southern California Sheet No. 11901 Print · USGSGreater Los Angeles at the dawn of the twentieth century is a landscape of growing citrus towns and a burgeoning rail network. Genealogists and historians can trace the early gridded streets of Hollywood and Pasadena or locate landmarks like Bear Lake and the Cahuilla Indian Reservation.6 unique versions available - 1901 Map of Anaheim
1901 Anaheim1901 Print · USGSOrange County's citrus and rail heartland is meticulously detailed at the start of the century, showing the early layouts of Anaheim and Fullerton. Genealogists can trace early homesteads and rail stops like Loara, Miraflores, and Olinda.6 unique versions available - 1902 Map of Corona
1902 Corona1902 Print · USGSThe Orange County and Riverside borderlands at the start of the 1900s show an era of rapid rail expansion and water engineering. Researchers can trace the early footprints of Anaheim and Orange or find vanished industry at the Santiago Coal Mine.7 unique versions available - 1904 Map of Pomona
1904 Pomona1904 Print · USGSThe eastern San Gabriel Valley is shown here at the turn of the century as a burgeoning network of citrus towns and vital rail lines. Genealogists can trace early homesteads and vanished stops such as Lordsburg, Alosta, and the Rowland Siding along the Southern Pacific RR.7 unique versions available - 1904 Map of Southern California Sheet No. 1, 1905 Print
1904 Southern California Sheet No. 11905 Print · USGSSouthern California at the dawn of the twentieth century shows a landscape of citrus groves and coastal towns connected by rail. Genealogists and historians can trace early settlements like San Juan Capistrano, find remote sites like the Rose Mine, and study the original water systems of the Santa Ana River.2 unique versions available - 1927 Map of Covina
1927 Covina1927 Print · USGSThe eastern San Gabriel Valley was a thriving agricultural and transit hub in the 1920s, dominated by orchards and sprawling ranch lands. Genealogists can trace family roots through settlements like Covina, the Diamond Bar Ranch, and the Protestant Home for Boys.3 unique versions available - 1928 Map of Claremont
1928 Claremont1928 Print · USGSEastern Los Angeles County appears here in the late twenties, during a period of rapid suburban and academic growth. Researchers can trace the early layouts of Claremont and Pomona, locating Pomona College, the Pacific Electric lines, and the Pomona Cemetery.3 unique versions available - 1928 Map of La Brea
1928 La Brea1928 Print · USGSThe hills of Eastern Los Angeles County are captured here in the late twenties during a period of expanding ranching and early oil exploration. Genealogists and historians can trace family-named sites like Silver Peak Ranch, local landmarks such as Fairview School, and the path of the Union Pacific Railroad.3 unique versions available - 1935 Map of Olinda
1935 Olinda1935 Print · USGSOrange County in the mid-1930s shows an evolving landscape of rail lines and irrigation networks. Genealogists and local historians can trace the early footprints of Yorba Linda and Placentia, or locate defunct rail stops like Loftus and Carlton. - 1942 Map of Anaheim
1942 Anaheim1942 Print · USGSOrange County's agricultural heart is captured mid-century during a period of rapid wartime development. Genealogists can locate family landmarks like Diamond Bar Ranch, local schools such as Alamitos Sch, and communities like Garden Grove or Stanton.2 unique versions available - 1947 Map of Santa Ana, 1949 Print
1947 Santa Ana1949 Print · USGSSouthern California is depicted here in the late forties, showing the expansion of the Inland Empire and the Orange County coast. Researchers can trace the early layout of Palm Springs or locate long-standing tribal lands like the Pala Indian Reservation and Rincon Indian Res. - 1949 Map of Santa Ana
1949 Santa Ana1949 Print · USGSSouthern California underwent a profound transformation in the late 1940s as military installations and citrus groves shared the landscape. Researchers can trace early coastal growth at Laguna Beach, military history at Camp Pendleton, and the rail corridors of the Pacific Electric. - 1949 Map of Yorba Linda, 1957 Print
1949 Yorba Linda1957 Print · USGSOrange and Los Angeles counties meet in this postwar survey during a time of industrial oil production and expanding citrus groves. Researchers can trace early infrastructure like the Pacific Electric railroad and landmarks such as La Vida Mineral Springs or the Olinda Oil Field.2 unique versions available - 1950 Map of Yorba Linda
1950 Yorba Linda1950 Print · USGSMid-century Orange County is caught in a moment of transition between its petroleum roots and growing citrus communities. Genealogists and local historians can trace the early grids of Yorba Linda and Placentia or locate sites like La Vida Mineral Springs and the Olinda Oil Field. - 1953 Map of San Bernardino
1953 San Bernardino1953 Print · USGSSouthern California underwent massive post-war growth as suburban sprawl reached the foothills of the San Bernardino Mountains. Genealogists and historians can trace the rail-and-road roots of the Inland Empire through the Union Pacific RR and Lake Arrowhead resorts.2 unique versions available - 1954 Map of San Dimas, 1956 Print
1954 San Dimas1956 Print · USGSEastern Los Angeles County appears at a moment of transition in the mid-fifties as suburban growth begins to surround the area's agricultural roots. Researchers can trace historic schools and cemeteries, from Evergreen Cemetery to the Naval Ordnance Plant and Diamond Bar Ranch.2 unique versions available - 1956 Map of San Bernardino
1956 San Bernardino1956 Print · USGSSouthern California's Inland Empire and High Desert come into focus in the mid-fifties as agriculture gives way to suburban and military growth. Trace early rail lines like the Pacific Electric or find remote landmarks like Camp Rock Mine and George AFB. - 1956 Map of Santa Ana
1956 Santa Ana1956 Print · USGSSouthern California underwent massive mid-century transformation as suburban growth met major military and water projects. Trace the postwar expansion of Santa Ana and Riverside, the layout of Camp Pendleton, and the path of the Colorado River Aqueduct. - 1957 Map of San Bernardino
1957 San Bernardino1957 Print · USGSSouthern California's Inland Empire and High Desert met during the postwar expansion of the late fifties. Genealogists and historians can trace the growth of San Bernardino and Redlands alongside remote landmarks like Edwards AFB and the Camp Rock Mine. - 1958 Map of San Bernardino, 1975 Print
1958 San Bernardino1975 Print · USGSSouthern California’s Inland Empire and High Desert come into focus during the mid-century boom, showing the rise of suburbs and massive military installations. Researchers can trace the rail networks of the Union Pacific RR or locate landmarks like Norton AFB and Big Bear Lake. - 1959 Map of San Bernardino
1959 San Bernardino1959 Print · USGSSouthern California underwent a massive transformation in the late fifties as suburban growth and military power reshaped the desert and valley. Researchers can trace the legacy of the Union Pacific Railroad and locate early footprints of Joshua Tree National Monument and Edwards Air Force Base. - 1959 Map of Santa Ana, 1971 Print
1959 Santa Ana1971 Print · USGSSouthern California is captured in a decade of transformation, from the Orange County coast to the desert floor. Researchers can trace the mid-century footprints of Camp Pendleton, March Air Force Base, and the original Ortega Highway.3 unique versions available - 1960 Map of Santa Ana
1960 Santa Ana1960 Print · USGSSouthern California's coastal plains and inland deserts meet in this mid-century survey of the burgeoning Orange and Riverside county corridors. Researchers can trace the layout of early freeway systems, find tribal lands like the Soboba Indian Reservation, and locate military landmarks such as March Field.2 unique versions available - 1964 Map of Yorba Linda, 1965 Print
1964 Yorba Linda1965 Print · USGSOrange County's northern hills were transitioning from oil derricks to suburban neighborhoods in the mid-sixties. Local researchers can trace early school sites like Richard M Nixon Sch, explore the grounds of La Vida Mineral Springs, or locate old landmarks in Sleepy Hollow.3 unique versions available - 1965 Map of Santa Ana
1965 Santa Ana1965 Print · USGSSouthern California is captured in a decade of rapid growth, showing the coastal expansion from Santa Ana down to Oceanside. Genealogists and historians can trace the mid-century development of places like Garden Grove or the rural reaches of Escondido and the Palomar Observatory.
Showing maps 1-25 of 30
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