Population
21,175
New CastleCensus, July 2025
From 21,891 in July 2020 to 21,175 in July 2025.
The Census Bureau's estimate of everyone living here on July 1.
New Castle by the numbers
Official figures for New Castle. Each one shows its date, its source and the area it covers. A figure for a larger area says so.
People
Change in a year
-0.4%
New CastleCensus, 2024 to 2025
Change in the population estimate over one year, from July 1 to July 1, both from the same release.
Change over 5 years
-3.3%
New CastleCensus, 2020 to 2025
Change in the population estimate over five years, from July 1 to July 1, both from the same release.
Sources
- U.S. Census Bureau, Population Estimates, Vintage 2025 · Public domain
Figures are shown as each source publishes them. Survey figures carry a 90% margin of error. A figure for a larger area is labelled with that area.