Four Square Mile, CO

Four Square Mile is a 2.70-square-mile county enclave surrounded by Denver and Aurora, and it functions more like a dense urban neighborhood than its unincorporated status suggests. In 2020, its 22,872 residents produced a density of 8,465 occupants per square mile. Renting is the dominant housing arrangement: Census estimates for 2020 through 2024 put owner occupancy at 26.4 percent, median gross rent at $1,833, and the median value of owner-occupied homes at $474,200. The same estimates counted 10,138 households with an average of 2.27 members. More than a quarter of residents were born outside the United States, and 32.4 percent of people age five or older spoke a language other than English at home during that period.

Public space threads through the enclave in several forms. The High Line Canal and Cherry Creek trails provide long-distance walking and cycling routes, while the Wabash trailhead gives the neighborhood direct access to the Cherry Creek corridor. Tsistsistas-Hinono'ei Park, whose name honors the Cheyenne and Arapaho peoples, offers a walking track, playground, dog park, community garden, lawns, public art, grills, and reservable pavilions. Buses on Iliff Avenue and South Parker Road connect the area with the wider RTD network; Route 83 serves stops along Parker Road and reaches Nine Mile station.

The county is also deciding how this already dense place should change. During summer 2026, Arapahoe County held an open house and public survey on transit-oriented zoning for Four Square Mile, responding to a state requirement for more housing capacity near frequent transit. Its subarea plan similarly identifies development pressure, mixed housing and business uses, trails, and parks as defining concerns. With only county government, no municipal downtown, and a large renter majority, daily community activity gathers along the bus corridors, trail crossings, small commercial areas, and shared park rather than around a traditional civic center.