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Old Maps of Ontario, California for Academic Research

Study the evolution of Ontario with 43 high-resolution historic maps. Whether you're teaching, researching, or modeling changes in land use, these maps provide essential visual documentation of urban, environmental, and geographic change.

  • Analyze long-term change: Track patterns in development, transportation, and natural features.
  • Ideal for environmental or urban studies: Support academic projects with primary historical map data.
  • Use in the classroom or lab: Educators and researchers rely on these maps to bring historical context to life.

These maps are a powerful tool for teaching, research, and visualizing how Ontario has changed over the decades.

Ontario, CA maps

(43)
  1. 1897 Map of Cucamonga
    1897 Map of Cucamonga
    1897 Cucamonga
    1897 Print · USGS
    In the late nineteenth century, the Inland Empire was a rapidly emerging rail and citrus hub defined by major land grants. Genealogists and researchers can trace the early footprints of Cucamonga, Ontario, and Pomona alongside the Narrow Gauge and Southern Pacific lines.
  4. 1900 Map of Cucamonga
    1900 Map of Cucamonga
    1900 Cucamonga
    1900 Print · USGS
    San Bernardino and Los Angeles Counties are shown here during the late nineteenth-century citrus boom, before urban sprawl merged these distinct agricultural colonies. Trace early rail lines through Ioamosa, Claremont, and Chino, or locate the isolated Toll House and Power House in the northern canyons.
  7. 1901 Map of Southern California Sheet No. 1
    1901 Map of Southern California Sheet No. 1
    1901 Southern California Sheet No. 1
    1901 Print · USGS
    Greater 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
  10. 1902 Map of Corona
    1902 Map of Corona
    1902 Corona
    1902 Print · USGS
    The 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
  13. 1903 Map of Cucamonga
    1903 Map of Cucamonga
    1903 Cucamonga
    1903 Print · USGS
    The Inland Empire is shown at a pivotal moment of agricultural expansion in the early twentieth century, when irrigation was transforming the valley. Trace the early rail networks of the Southern Pacific and the Santa Fe through citrus-growing centers like Ontario, Cucamonga, and Ioamosa.
    11 unique versions available
  16. 1904 Map of Southern California Sheet No. 1, 1905 Print
    1904 Map of Southern California Sheet No. 1, 1905 Print
    1904 Southern California Sheet No. 1
    1905 Print · USGS
    Southern 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
  19. 1933 Map of Prado
    1933 Map of Prado
    1933 Prado
    1933 Print · USGS
    In the early 1930s, the Chino Valley was a hub of irrigation canals and rail-side settlements before later development changed the landscape. Genealogists and historians can trace old homesteads like Pellissier Ranch and schools like the California Junior Republic School.
  22. 1933 Map of Ontario
    1933 Map of Ontario
    1933 Ontario
    1933 Print · USGS
    The citrus heart of the Inland Empire comes into focus in the early thirties as it transitions into a major transit hub. Genealogists and historians can trace the early footprints of Ontario, Upland, and Chino, while locating landmarks like Bellevue Cem and the Pacific Electric line.
  25. 1941 Map of Prado
    1941 Map of Prado
    1941 Prado
    1941 Print · USGS
    Southern California's inland corridor is captured here in the 1930s, showing the river valley before the dam changed the landscape forever. Trace the old routes of the Union Pacific through Prado and locate local landmarks like the Pellissier Ranch.
    2 unique versions available
  28. 1942 Map of Corona and Vicinity
    1942 Map of Corona and Vicinity
    1942 Corona and Vicinity
    1942 Print · USGS
    The Riverside County citrus belt thrives in the early 1940s, showing a landscape defined by orchards and early suburban expansion. Researchers can trace the development of Norco around the Norconian Club or locate regional landmarks like La Sierra College.
  31. 1942 Map of Ontario and Vicinity
    1942 Map of Ontario and Vicinity
    1942 Ontario and Vicinity
    1942 Print · USGS
    The Inland Empire is shown at a pivotal moment in the early 1940s, when orange groves and vineyards still dominated the landscape between the mountains and the valley floor. Researchers can trace the rail corridors of the SOUTHERN PACIFIC and the Pacific Electric while locating old neighborhood markers like Narod, Sunsweet, and the Sierra Vista Sch.
    2 unique versions available
  34. 1942 Map of Corona, 1947 Print
    1942 Map of Corona, 1947 Print
    1942 Corona
    1947 Print · USGS
    Riverside County at the dawn of the 1940s reveals a unique mix of agricultural roots, mountain canyons, and significant regional infrastructure projects. Genealogists and local historians can trace the early street plans of Corona and Norco, or locate landmarks like the East Vale Sch and the Santiago Reservoir.
    2 unique versions available
  37. 1943 Map of Corona
    1943 Map of Corona
    1943 Corona
    1943 Print · USGS
    The Santa Ana River valley during the mid-forties shows a landscape shaped by water management and early inland growth. Trace the development of Corona and Norco alongside the massive Prado Dam and local landmarks like the East Vale Sch.
  40. 1944 Map of Cucamonga
    1944 Map of Cucamonga
    1944 Cucamonga
    1944 Print · USGS
    The San Gabriel Valley and Inland Empire are shown here during the mid-forties, capturing the peak of the region's citrus era and rail-based transit. Researchers can trace early campus layouts at Pomona College or locate vanished landmarks like the Monta Vista Resort and Padua Hills Theater.
  43. 1947 Map of Santa Ana, 1949 Print
    1947 Map of Santa Ana, 1949 Print
    1947 Santa Ana
    1949 Print · USGS
    Southern 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.
  46. 1949 Map of Santa Ana
    1949 Map of Santa Ana
    1949 Santa Ana
    1949 Print · USGS
    Southern 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.
  49. 1949 Map of Prado Dam, 1958 Print
    1949 Map of Prado Dam, 1958 Print
    1949 Prado Dam
    1958 Print · USGS
    San Bernardino and Riverside counties meet at the site of the newly completed dam and flood basin in the late 1940s. Trace the footprints of the Cal-Aero Flight Academy, the California Institution for Men, and the Rancho Santa Ana Botanic Gardens.
    2 unique versions available
  52. 1950 Map of Prado Dam
    1950 Map of Prado Dam
    1950 Prado Dam
    1950 Print · USGS
    The Prado Dam area at the start of the 1950s shows a unique mix of institutional expansion, aviation history, and flood control. Local researchers can trace the Cal-Aero Flight Academy, the California Institution for Men, and the Rancho Santa Ana Botanic Gardens.
  55. 1953 Map of San Bernardino
    1953 Map of San Bernardino
    1953 San Bernardino
    1953 Print · USGS
    Southern 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
  58. 1953 Map of Guasti, 1955 Print
    1953 Map of Guasti, 1955 Print
    1953 Guasti
    1955 Print · USGS
    San Bernardino and Riverside Counties are shown here during the post-war industrial boom, where vineyards and heavy industry collide. Genealogists and historians can trace the development of Cucamonga and Guasti alongside the Kaiser Steel Plant.
    2 unique versions available
  61. 1954 Map of Corona North, 1955 Print
    1954 Map of Corona North, 1955 Print
    1954 Corona North
    1955 Print · USGS
    The northern Chino Basin and the Santa Ana River valley are captured here in the mid-fifties, showing a mix of military installations and citrus groves. Genealogists and local historians can trace family-named sites like Fuller Ranch, early education at East Vale School, and the grounds of the Naval Hospital.
    2 unique versions available
  64. 1954 Map of Ontario, 1955 Print
    1954 Map of Ontario, 1955 Print
    1954 Ontario
    1955 Print · USGS
    The Pomona Valley was undergoing rapid postwar transformation in the mid-fifties as academic and industrial expansion reshaped the landscape. Researchers can find prominent landmarks like Pomona College, the Ontario International Airport, and the sprawling grounds of the Chino Prison.
    2 unique versions available
  67. 1954 Map of Ontario, 1959 Print
    1954 Map of Ontario, 1959 Print
    1954 Ontario
    1959 Print · USGS
    The Pomona Valley in the mid-fifties is captured here as a sprawling network of citrus-era settlements and rising post-war industry. Genealogists and local researchers can trace the early footprints of the Claremont Associated Colleges, the Steel Plant, and Ontario International Airport.
    5 unique versions available
  70. 1956 Map of San Bernardino
    1956 Map of San Bernardino
    1956 San Bernardino
    1956 Print · USGS
    Southern 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.
  73. 1956 Map of Santa Ana
    1956 Map of Santa Ana
    1956 Santa Ana
    1956 Print · USGS
    Southern 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.
Showing maps 1-25 of 43

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Frequently asked questions

  • What are the different types of historical maps available for Ontario?
  • What is the oldest map of Ontario?
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  • Where can I download high-res historical maps of Ontario?
  • Are there historical topographic maps available for Ontario?
  • Is there historical aerial imagery available for Ontario?
  • Where are historical maps of Ontario sourced from?