Denver's flag was designed by a high school student, which may be the most Denver fact about it. Margaret Overbeck of North High School drew a mountain range as a single white zigzag, put a gold sun in a blue sky above it and red earth below, and won 50 dollars. A century later her design ranks among the best city flags in the country, and nobody has ever seriously proposed changing it.
A contest, a schoolgirl, and fifty dollars
In the early 1920s the Sons of the American Revolution decided Denver ought to have a flag and offered 25 dollars for the best design. The city council thought the cause worth another 25, bringing the purse to 50 dollars. More than 150 entries came in, and the Denver Art Commission, acting as judge, chose the one submitted by Margaret Overbeck, a student at North High School on the city's north side. The council adopted her design as the official municipal flag in 1926.
That is nearly the whole institutional history. Unlike Chicago, which has amended its flag twice, or the many cities that have cycled through redesigns, Denver has flown the same flag for a hundred years. The Denver Public Library holds the paper trail, a municipal flag design collection covering 1926 to 1999, and it is thin for a good reason: there was nothing to fix.
A landscape in four shapes
The flag is a picture, which is rarer than it sounds. Most American city flags of its era were seals on bedsheets; Overbeck instead drew what you see looking west from Denver. The white zigzag across the center is the front range of the Rocky Mountains under snow. Above it, the field is sky blue. Below it, the field is red for the region's soil, the "colorado" (colored red) earth that named the state. The yellow disk in the blue is the sun, and its gold recalls the metal in the hills, the strike that turned a South Platte campsite into a city in 1858.
Placement carries meaning too. The sun sits on the flag's vertical centerline because Denver sits near the center of Colorado, the crossroads position that made it the territorial and then state capital. And the zigzag is doing double duty: beyond being a mountain range, it is described as a nod to Colorado's Native American heritage, the stepped patterns of Indigenous textile and bead work rendered at flag scale.
The palette is the familiar American red, white, and blue plus gold, which happens to be exactly the palette of the Colorado state flag adopted fifteen years earlier. City and state read as a matched set without sharing a single shape.
The odd ratio
Denver's flag is officially 4:7, a proportion almost nothing else uses. U.S. civic flags overwhelmingly come in 2:3 or 3:5, and the federal flag is 10:19. In commerce the distinction mostly evaporates, since flag makers print civic designs on standard 3:5 stock, but the specified geometry gives the design its slightly long, banner-like sweep, with the two mountain peaks framing the sun rather than crowding it.
The construction is simple enough to describe in a sentence: the zigzag rises from the lower corners to two peaks, dips to a valley at center, and the sun hangs in that valley, framed by the summits on either side. That simplicity is why the flag survives reproduction at any size, from lapel pin to stadium banner, without losing anything. It also makes the flag trivially easy to draw from memory, the informal test vexillologists apply to separate working flags from decorative ones. A five-year-old with four crayons can produce a recognizable Denver flag in under a minute, which is more than can be said for most American city flags of the 1920s.
Third best in America
When the North American Vexillological Association surveyed 150 U.S. city flags in 2004, Denver placed third, behind Washington, D.C. (9.17) and Chicago (9.03). The survey's favorites all share the same traits: few colors, no lettering, no municipal seal, high contrast, and imagery specific enough that no other city could fly it. Denver's entry is arguably the most literal of the top three. D.C.'s stars and bars are borrowed heraldry and Chicago's stars are abstractions, but Denver's flag is simply the view, compressed.
The ranking arrived just as American cities began caring about their flags again, a revival usually dated to Roman Mars's much-viewed 2015 TED talk on civic flag design. Cities with committee-built seal flags scrambled to redesign; Denver got to sit the whole episode out. The flag's zigzag-and-sun motif now shows up on local apparel, craft beer labels, and murals, the standard evidence that a city flag has crossed from official emblem to shared property.
Margaret Overbeck remains one of the few named women behind a major American civic flag, and one of the few designers of any kind who did the work as a teenager. Her hometown has been flying her homework since 1926.
References
[1] "Flag of Denver," Wikipedia. https://en.wikipedia.org/wiki/Flag_of_Denver
[2] "Denver, Colorado (U.S.)," Flags of the World. https://www.crwflags.com/fotw/flags/us-co-dv.html
[3] Denver Public Library, Western History Collection, "Denver Municipal Flag Design, 1926-1999" (archival collection). https://archives.denverlibrary.org/repositories/3/resources/4044
[4] North American Vexillological Association (NAVA), "American City Flags Survey" (2004). https://nava.org/digital-library/design/surveys/2004-American-City-Flags-Survey.pdf