The median income in the area showed notable fluctuations over the decade. It peaked in 2017 at $141,892 but experienced a significant drop to $120,573 in 2022, a decrease of about 15% from the peak. The population remained relatively stable, fluctuating between approximately 11,500 and 12,500 residents over the decade.

There appears to be a correlation between demographic changes and income levels. The period of highest median income (2015-2018) coincided with a more homogeneous racial composition. As the community became more diverse, particularly with the increase in the Hispanic population, there was a noticeable decrease in median income.

Despite the recent decrease, the median income in this zip code remains significantly higher than the national average, indicating an affluent area. The increasing diversity in this zip code aligns with broader national trends of growing diversity in suburban areas, particularly those near major metropolitan centers like New York City.

The decrease in median income coupled with increasing diversity could suggest an influx of middle-income diverse families into a previously highly affluent area or potential changes in local economic structures or job markets affecting overall income levels. With a population of 12,462 in 2022 and an estimated 4,775 housing units, the area maintains a low population density, typical of affluent suburban villages.

In conclusion, while Upper Brookville remains a "White Majority" area with high median incomes, it is clearly transitioning towards greater diversity. This demographic shift, coupled with recent income fluctuations, suggests a community in flux, potentially reflecting broader socio-economic changes in the region. The area's evolution from a highly homogeneous, extremely affluent enclave to a more diverse, though still wealthy, community mirrors trends seen in many suburban areas near major cities, as they adapt to changing demographics and economic realities.