Key Colony Beach is a municipality in the middle of the Florida Keys, Monroe County, Florida, United States. The population was 790 at the 2020 census.
Around 1956–1957, residents of nearby Marathon began discussing incorporating the entire area. Sadowski was not keen on having his development swallowed up into Marathon, so he began the process of incorporating the island into its own city. The Florida Legislature passed legislation in June 1957 allowing incorporation, which local residents passed unanimously on September 24, 1957, thus creating today's Key Colony Beach.
Demographics
2010 and 2020 census
{| class="wikitable"
|+Key Colony Beach racial composition<br> (Hispanics excluded from racial categories)<br> (NH = Non-Hispanic)<br>
!Race
!Pop 2010
!Pop 2020
!% 2010
!% 2020
|-
|White (NH)
|755
|645
|94.73%
|81.65%
|-
|Black or African American (NH)
|4
|19
|0.50%
|2.41%
|-
|Native American or Alaska Native (NH)
|2
|0
|0.25%
|0.00%
|-
|Asian (NH)
|1
|7
|0.13%
|0.89%
|-
|Pacific Islander or Native Hawaiian (NH)
|0
|1
|0.00%
|0.13%
|-
|Some other race (NH)
|0
|5
|0.00%
|0.63%
|-
|Two or more races/Multiracial (NH)
|3
|11
|0.38%
|1.39%
|-
|Hispanic or Latino (any race)
|32
|102
|4.02%
|12.91%
|-
|Total
|797
|790
|
|
|-
|}
As of the 2020 United States census, there were 790 people, 321 households, and 180 families residing in the city.
As of the 2010 United States census, there were 797 people, 336 households, and 202 families residing in the city.
2000 census
As of the census
Notable person
- Charley Lau, baseball player and coach