Town in Garfield County, Colorado · 2.5 sq mi · 1,966 people per sq mi
4,907 people live in New Castle. The typical household earns $80,084, and the median resident is 38.7 years old.
2026 projection
From 4,923 in 2020
Poverty rate 6.17%
Men 34.8 · Women 40.4
1890–2026
4,907
2026 projection
0.3% since 2020 (decrease)
Source: U.S. Census Bureau decennial counts and annual estimates, including 2010–2020 intercensal estimates. 2026 is a projection. Values between recorded years are interpolated.
Use the left and right arrow keys to inspect population observations.
1890–2026
4,907
2026 projection
0.3% since 2020 (decrease)
Source: U.S. Census Bureau decennial counts and annual estimates, including 2010–2020 intercensal estimates. 2026 is a projection. Values between recorded years are interpolated.
Use the left and right arrow keys to inspect population observations.
| 2026 | 4,907 | +11 | 0.22% |
|---|---|---|---|
| 2025 | 4,896 | -62 | 1.25% |
| 2024 | 4,958 | +51 | 1.04% |
| 2023 | 4,907 | +45 | 0.93% |
| 2022 | 4,862 | -19 | 0.39% |
| 2021 | 4,881 | -42 | 0.85% |
| 2020 | 4,923 | -10 | 0.20% |
| 2019 | 4,933 | -1 | 0.02% |
| 2018 | 4,934 | +206 | 4.36% |
| 2017 | 4,728 | +75 | 1.61% |
Showing 10 of 29 years.
The 2020 row compares the April 1 Census count with the July 1, 2019 estimate (about nine months). Its Growth and Annual change therefore do not represent a full year.
New Castle has a population change lower than Garfield County, Colorado, and the U.S.
Change from July 1, 2020 to July 1, 2025 population estimates—not annualized growth or site projections.
Source: U.S. Census Bureau. U.S. totals are summed from the 50 states and D.C.; unavailable comparisons are omitted.
U.S. Census Bureau, 2024 ACS 5-year estimates · Table S0101
Each square is about 1% of residents (roughly 49 people).
Hispanic or Latino residents can be of any race. All other groups exclude Hispanic residents.
U.S. Census Bureau, 2024 ACS 5-year estimates · Table B03002
Half of households earn more, half earn less
Typical yearly pay for a worker 25 or older.
About 1 in 16 residents
56% of residents age 15 and older are married.
| Status | Overall | Male | Female |
|---|---|---|---|
| Married | 56% | 59% | 53% |
| Never married | 24% | 36% | 13% |
| Divorced | 10% | 6% | 15% |
| Widowed | 9% | 0% | 17% |
| Separated | 1% | 0% | 2% |
U.S. Census Bureau, 2024 ACS 5-year estimates · Table S1201
14 sources