1900s (20th Century) Maps of Boulder, Colorado
Explore 29 historic maps of Boulder 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 Boulder'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 Boulder's history through authentic maps from the 1900s. This is your window into the past.
Boulder, CO maps
(29)- 1902 Map of Boulder, 1957 Print
1902 Boulder1957 Print · USGSThe Front Range foothills hum with mining and rail activity at the turn of the century. Genealogy researchers can trace families in old mining camps like Gold Hill, Wallstreet, and Sunshine, or follow the winding Colorado and Northwestern RR. - 1904 Map of Niwot
1904 Niwot1904 Print · USGSThe northern Colorado plains come alive in the early 1900s, showcasing a landscape shaped by coal mining and extensive irrigation. Genealogists and historians can trace family roots through settlements like Hygiene, Niwot, and Erie, or locate industrial sites such as Dixon Mill and the Gladstone Mine.3 unique versions available - 1904 Map of Boulder
1904 Boulder1904 Print · USGSThe Front Range foothills hum with mining activity at the start of the twentieth century, as narrow-gauge rails climb the canyons. Genealogists and historians can trace defunct rail stops and mining camps like Salina, Wallstreet, and Gold Hill Sta..6 unique versions available - 1906 Map of Blackhawk
1906 Blackhawk1906 Print · USGSThe Front Range foothills and mining districts come alive in this early century survey, showing the transition from mountain ranching to industrial rail. Genealogists and historians can trace family holdings like Winiger Ranch, find the Pine Glade School, and follow the Denver Northwestern and Pacific RR.5 unique versions available - 1942 Map of Eldorado Springs
1942 Eldorado Springs1942 Print · USGSJust before the mid-century, the mountain interface west of Boulder was a landscape of remote ranches and rugged rail lines. Trace the early settlement of Eldorado Springs and find vanished landmarks like the Pine Grove Sch and the Coal Creek Store.4 unique versions available - 1942 Map of Louisville
1942 Louisville1942 Print · USGSLouisville and the high plains of Boulder County are captured here just before the mid-century expansion. Genealogists and historians can trace the early footprints of Superior, Marshall, and Louisville, or locate rural landmarks like the Sacred Heart Ch and Shamrock Sch.3 unique versions available - 1944 Map of Eldorado Springs
1944 Eldorado Springs1944 Print · USGSThe Front Range foothills in the 1940s reveal a landscape of mountain ranches and deep canyons just south of Boulder. Genealogists and hikers can trace old homesteads like Walker Ranch, the winding Denver and Salt Lake RR, and early landmarks such as the Copeland Mine.2 unique versions available - 1950 Map of Louisville, 1955 Print
1950 Louisville1955 Print · USGSThe Boulder Valley coal fields and irrigation networks are on full display in the mid-twentieth century. Researchers can trace dozens of mining sites like the Eldorado Mine, find the Superior Cemetery, and locate rural schools including Marshall Sch. - 1950 Map of Niwot, 1957 Print
1950 Niwot1957 Print · USGSThe Boulder Valley in the early fifties is captured here as a landscape of irrigation ditches, rural schoolhouses, and heavy industry. Genealogists can locate family landmarks like the Niwot Cemetery, the Batchelder School, and the industrial Fluorspar Mill near Valmont.4 unique versions available - 1951 Map of Niwot
1951 Niwot1951 Print · USGSBoulder County in the early fifties reveals a landscape shaped by irrigation ditches and the early industrial hub of Valmont. Genealogists and historians can trace family roots through numerous rural school sites like Niwot School and historic burial grounds including Valmont Cemetery. - 1953 Map of Denver, 1964 Print
1953 Denver1964 Print · USGSDenver and the Colorado Front Range are captured here during a decade of post-war growth and military expansion. Researchers can trace the sprawling rail lines of the Union Pacific, locate the State Capitol, and explore historic mountain mining hubs like Central City.6 unique versions available - 1954 Map of Greeley, 1966 Print
1954 Greeley1966 Print · USGSNorthern Colorado transitions from high-alpine peaks to the irrigated South Platte valley during this mid-century period of growth. Genealogists and historians can trace rail-connected hubs like Greeley and Longmont alongside landmarks like Horsetooth Reservoir and Estes Park.3 unique versions available - 1957 Map of Denver
1957 Denver1957 Print · USGSDenver and the Colorado Front Range are seen here during a mid-century period of intense military and urban expansion. Trace the footprints of the Rocky Mountain Arsenal, the early United States Air Force Academy, and the Lowry AF Base. - 1957 Map of Greeley
1957 Greeley1957 Print · USGSNorthern Colorado in the mid-fifties is captured here as the agricultural plains of Weld County meet the high peaks of the Front Range. Genealogists and historians can trace rail-linked towns like Keenesburg and Roggen or locate early water features such as Boyd Lake and Fossil Creek Reservoir. - 1957 Map of Louisville, 1958 Print
1957 Louisville1958 Print · USGSThe northern Colorado coalfields and rural landscapes are captured here during a period of industrial transition. Researchers can trace numerous historic coal operations like the Cracker Jack Mine and Industrial Mine, alongside the early Denver Boulder Turnpike.2 unique versions available - 1957 Map of Boulder, 1959 Print
1957 Boulder1959 Print · USGSBoulder and the Front Range foothills are shown during a time of mid-century expansion and active mining heritage. Trace the development of the University of Colorado and find numerous historic mines like the Sun and Moon Mine or Emancipation Mine.3 unique versions available - 1957 Map of Boulder, 1960 Print
1957 Boulder1960 Print · USGSBoulder and the surrounding mountain canyons are captured in the late fifties, showing a landscape defined by mining history and early settlement. Trace the footprints of old camps like Gold Hill and Wallstreet, or locate the historic Bunce School and Gresham (Site).3 unique versions available - 1958 Map of Greeley
1958 Greeley1958 Print · USGSNorthern Colorado and the high peaks of the Front Range appear here in the mid-fifties as the region's agricultural and rail networks were fully established. Genealogists can locate family homes near Virginia Dale, Waverly, or Kuner, and trace the path of the Union Pacific Railroad through Greeley. - 1958 Map of Denver
1958 Denver1958 Print · USGSDenver and the Colorado Front Range are captured here during the mid-century suburban boom. Trace the footprints of military installations like Buckley Air Force Base alongside the established rail networks of the Colorado & Southern Ry. - 1960 Map of Denver
1960 Denver1960 Print · USGSDenver and the Colorado Front Range are seen here at a pivotal moment of postwar expansion into the plains and foothills. Researchers can trace the mid-century rail network of the Denver & Rio Grande Western RR and locate historic institutional landmarks like Buckley Field and the Colorado School of Mines. - 1961 Map of Greeley
1961 Greeley1961 Print · USGSNorthern Colorado's transition from high mountain peaks to irrigated plains is captured here just as the post-war population boom reached the Front Range. Researchers can trace early water infrastructure and rail lines like the Great Western RR connecting sugar beet hubs from Fort Collins to Greeley. - 1964 Map of Greeley
1964 Greeley1964 Print · USGSThe Front Range corridor and high peaks of the Rockies appear here in the mid-1960s, showing the intersection of mountain wilderness and plains agriculture. Trace the rail routes of the Great Western RR or locate landmarks like Longs Peak and Horsetooth Reservoir. - 1965 Map of Greeley
1965 Greeley1965 Print · USGSNorthern Colorado in the mid-sixties shows a landscape defined by high mountain summits and the growing irrigation networks of the plains. Genealogists and historians can trace rail-side towns like Wellington or follow the early tracks of the Union Pacific Railroad past Longs Peak. - 1965 Map of Louisville, 1967 Print
1965 Louisville1967 Print · USGSIn the mid-1960s, the plains south of Boulder balanced emerging suburban sprawl with secretive federal industry. Researchers can trace the massive Rocky Flats Plant, local landmarks like Marshall Lake, and the path of the Denver Boulder Turnpike.7 unique versions available - 1965 Map of Eldorado Springs, 1967 Print
1965 Eldorado Springs1967 Print · USGSThe Front Range foothills come into sharp focus in the mid-sixties, showing the intersection of mountain topography and burgeoning civic infrastructure. Trace the winding Denver and Rio Grande Western rail line through Crescent Village or find family roots near Eldorado Springs and Plainview.8 unique versions available
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