New Castle is a town in Garfield County, Colorado, home to about 4,880 people across 2.5 square miles. Its ZIP code is 81647.
Homes sold for a median of $380 per square foot in the three months ending August 2026, a buyer’s market.
Each card is that ZIP code’s whole market, including any part outside New Castle. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up New Castle’s story and what everyday life there is like, for people thinking about moving in.
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| Nearest major airport | Denver International Airport (DEN)154 miles away |
|---|---|
| Closer regional airport | Eagle County Regional Airport (EGE)34 miles away |
| Nearest city of 250,000+ | Denver, CO142 miles away |
| Nearest city of 1 million+ | Phoenix, AZ485 miles away |
Straight-line distances from the center of New Castle; driving is longer.
Source: Airports from OurAirports (scheduled passenger service); city centers and populations from the U.S. Census Bureau.
Source: Members of Congress from the congress-legislators project; districts from the Census Bureau’s relationship files; governor and mayor from Wikidata.
New Castle had 4,923 residents in the 2020 census, up 148% since 2000.
It’s the 118th largest of 472 towns in Colorado by population.
Garfield County grew from 5,835 residents in 1900 to 61,685 in 2020.
Garfield County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 88°F in summer, and winter lows average 10°F. About 12.7 inches of rain and melted snow fall in a typical year, with about 27 inches of snow.
Source: NOAA 1991–2020 climate normals, Rifle 3ene, CO weather station (10 miles away).
21,223 jobs at 2,705 businesses in Garfield County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
19 doctors and other health care providers list an office in New Castle.
Nearest hospitals
Providers with an office here
| Primary care doctors | 4 |
|---|---|
| Specialist doctors | 2 |
| Dentists | 1 |
| Nurse practitioners and physician assistants | 2 |
| Mental health providers | 6 |
| Physical and occupational therapists | 3 |
| Chiropractors | 1 |
| Pharmacies | 1 |
Source: Hospitals from CMS Hospital General Information (ratings are CMS overall star ratings); straight-line distances; providers from the CMS National Plan and Provider Enumeration System (NPPES), by practice address and primary specialty.
Parks (10 nearby)
Grocery stores
Libraries (1 nearby)
Museums (1 nearby)
Counts are within about 1.5 miles of the center of town.
Source: Map data © OpenStreetMap contributors (openstreetmap.org/copyright), as mapped by volunteers; it can miss places or include closed ones.
Public schools here are run by Garfield School District No. Re-2. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| Elk Creek ElementaryNew Castle | Pre-K–5 | 272 | Public | 0.2 mi |
| Kathryn Senor Elementary SchoolNew Castle | Pre-K–5 | 275 | Public | 1.0 mi |
| Riverside SchoolNew Castle | 6–8 | 483 | Public | 1.1 mi |
| Coal Ridge High SchoolNew Castle | 9–12 | 578 | Public | 3.8 mi |
| School | Grades | Students | Affiliation | Distance |
|---|---|---|---|---|
| Liberty Classical AcademyNew Castle | Pre-K–12 | 172 | Christian (no specific denomination) | 0.6 mi |
Source: U.S. Department of Education, NCES: Common Core of Data (2024-2025) for public schools; Private School Universe Survey (2023-2024) for private schools. Listed by address; we don’t rate schools.
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Town boundaries don’t always match ZIP codes: a ZIP code can cross into neighboring towns, and a town can share a ZIP code with its neighbors. Facts describe the town itself; market figures describe whole ZIP codes.