The median income in New Castle has shown significant growth over the decade, rising from $70,788 in 2013 to a peak of $95,692 in 2019, before declining slightly to $87,973 in 2022. This overall upward trend in income correlates with the slight increase in the white population percentage and could suggest economic improvements attracting or retaining more affluent residents.

The population has remained relatively stable, fluctuating between about 7,400 and 8,000 residents throughout the decade. The peak population of 8,039 in 2018 coincided with a period of rapid income growth, suggesting a possible influx of higher-income residents during this time.

The demographic trends in New Castle appear to be somewhat counter to national trends of increasing diversity. While the U.S. as a whole has been moving towards greater racial diversity, this zip code has maintained a strong white majority with only modest increases in other racial groups.

The income growth in this area has outpaced national averages, suggesting that New Castle has experienced stronger economic development than many other parts of the country. This could be attributed to regional economic factors in Colorado, such as growth in certain industries or migration patterns within the state.

The slight decrease in the Hispanic population percentage, coupled with income growth, might indicate gentrification processes or changes in local industries that have altered the community's demographic makeup. However, the maintenance of a significant Hispanic population suggests that the area still retains aspects of its cultural diversity.

New Castle has maintained its status as a "White Majority" community with "Moderate Diversity," while experiencing subtle demographic shifts and significant economic changes. The community appears to be slowly transitioning towards greater diversity while experiencing overall economic growth, positioning it as a relatively stable and prosperous area within Colorado.