San Marco Island, a neighborhood in Miami, Florida, demonstrates a demographic profile categorized as "Moderate Diversity" as of 2022. The neighborhood has a population of 199, with White (48%) and Hispanic (24%) populations forming the largest segments. San Marco Island is an affluent area, with a median income of $200,000 in 2022, significantly above the national average. This high-income status, combined with its island location, suggests an exclusive residential area with premium real estate.

Over the past decade, San Marco Island has undergone demographic transitions. From 2013 to 2017, the neighborhood was categorized as having a "White Majority," with the white population consistently above 50%. From 2018 to 2021, the area shifted to a "Majority-Minority" status, as the combined minority populations exceeded 50%, although whites remained the largest single group. By 2022, the neighborhood returned to "Moderate Diversity," with whites at 48% and other groups gaining significant representation.

The median income in San Marco Island has remained consistently high throughout the observed period, often reaching the data cap of $200,000. This suggests a persistently affluent community, even as racial demographics shifted. The transition to "Majority-Minority" status did not coincide with any significant drop in median income, indicating that incoming minority residents likely belonged to high-income brackets. Population figures have fluctuated but generally remained between 200-300 residents, suggesting a stable, possibly capacity-limited residential area.