| Official Name: | Four Square Mile, Colorado |
| Settlement Type: | Census Designated Place |
| Pushpin Map: | Colorado |
| Pushpin Label Position: | bottom |
| Pushpin Map Caption: | Location of the Four Square Mile CDP in the |
| Subdivision Type: | Country |
| Subdivision Name: |  United States |
| Subdivision Type1: | State |
| Subdivision Type2: | County |
| Subdivision Name2: | Arapahoe County |
| Government Type: | unincorporated community |
| Unit Pref: | US |
| Area Footnotes: | [1] |
| Area Total Km2: | 6.997 |
| Area Land Km2: | 6.997 |
| Area Water Km2: | 0.000 |
| Population As Of: | 2020 |
| Population Footnotes: | [2] |
| Population Total: | 22872 |
| Population Density Km2: | auto |
| Population Density Sq Mi: | auto |
| Timezone: | MST |
| Utc Offset: | -7 |
| Timezone Dst: | MDT |
| Utc Offset Dst: | -6 |
| Coordinates: | 39.6807°N -104.8879°W |
| Elevation M: | 1684 |
| Elevation Ft: | 5525 |
| Postal Code Type: | ZIP Code[3] |
| Area Codes: | 303 & 720 |
| Blank Name: | GNIS feature[4] |
| Blank Info: | Four Square Mile CDP |
Four Square Mile is an unincorporated community and a census-designated place (CDP) located in and governed by Arapahoe County, Colorado, United States. The population was 22,872 at the 2020 census. The CDP is a part of the Denver–Aurora–Lakewood, CO Metropolitan Statistical Area. The CDP is surrounded by Denver on the north, west, and south and by Aurora on the east. The name is derived from the four square miles bounded by Quebec Street, Mississippi Avenue, Havana Street and Yale Avenue. Annexation of the Arapahoe County enclave was contested between Denver and Aurora in the early 1970s, with Denver annexing east from Quebec Street and Aurora west from Havana Street.[5] Denver’s annexations were ultimately stopped by the Poundstone Amendment; Aurora is not similarly limited but made its most recent annexation to Dayton Street in 1984, leaving nearly three of the four square miles unincorporated. The Four Square Mile CDP includes Sullivan, a previous unincorporated community designation.[6] The area lies in ZIP codes 80231 and 80247.
The Four Square Mile CDP has an area of 6.997km2, all land.[1]
The United States Census Bureau defined the for the