Every ZIP code in the United States, with weather, radar, trivia and the numbers behind it. Five digits since 1963!

ZIP stands for Zone Improvement Plan. The codes went live on July 1, 1963.The lowest ZIP code is 00501 — the IRS in Holtsville, New York.The highest ZIP code is 99950, in Ketchikan, Alaska.Type 07734 into a calculator and turn it upside down: hELLO. It is Keansburg, New Jersey.12345 belongs to one company: General Electric in Schenectady, New York.The first digit is a region: 0 is New England and New Jersey, 9 is the West Coast, Alaska and Hawaii.Mr. ZIP, the cartoon mailman, was the mascot that sold the idea to America.ZIP+4 arrived in 1983 and can narrow a ZIP down to one side of one block.A ZIP code is a mail route, not a place: plenty of them cross county and even state lines.Play ZIP Hunt: guess the secret ZIP code of the day in six tries.
zipcodes.pro — CITY/CO/NEW-CASTLE

New Castle ZIP code, Colorado

The ZIP code for New Castle, CO is 81647, and its area code is 970.

USPS city name
1 ZIP code
Overlapping the city
1 more
Population
4,880
Area code
970

Mail addressed to New Castle uses the ZIP code above. 1 more ZIP code covers part of the city but is addressed as somewhere else; they are listed separately below.

New Castle in numbers

About 4,880 people live in New Castle, in 2,027 households. The median household income is $80,084 a year, 16% below the Colorado median of $95,470 (US: $80,734). The median owner-occupied home is valued at $454,300 (16% below the Colorado median), and median gross rent is $1,393 a month. The median age is 38.7; 32.1% of adults 25 and over hold a bachelor's degree or higher (45.7% across Colorado); the average commute takes 34 minutes.

Population4,880New Castle4,880
Households2,027New Castle2,027
Median age38.7New Castle38.7Colorado37.7US 38.9
Median household income$80,084New Castle$80,084Colorado$95,470US $80,734
Median home value$454,300New Castle$454,300Colorado$539,400US $332,700
Median gross rent$1,393New Castle$1,393Colorado$1,761US $1,413
Bachelor's degree or higher32.1%New Castle32.1%Colorado45.7%US 35.7%
Mean commute33.7 minNew Castle33.7 minColorado25.2 minUS 26.4 min
Population density1,955 / sq miNew Castle1,955 / sq mi

U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, for the census place New Castle town. Survey estimates carry margins of error, wider for small places. Sources and methods.

ZIP codes addressed as New Castle

ZIP codes with the USPS city name New Castle
ZIP City Type Population Median income Median home
81647 New Castle , CO Standard 6,882 $78,352 $456,200

Other ZIP codes overlapping New Castle

These ZIP codes cover part of New Castle but are addressed as somewhere else.

ZIP codes overlapping New Castle
ZIP City Type Population Median income Median home
81601 Glenwood Springs , CO Standard 16,844 $109,129 $798,900

Map of New Castle ZIP codes

81647

The ZIP codes of New Castle, CO, shaded. Outlines are Census ZIP Code Tabulation Areas (2020), which approximate the mail routes; PO-box and single-address codes have no area and are not drawn. Click any area to open its ZIP code.

Towns near New Castle

The nearest larger towns are Glenwood Springs (10,241 people, 10 mi), Rifle (10,570 people, 13 mi) and Carbondale (6,637 people, 21 mi).

Towns near New Castle
TownPopulationDistance
Silt 3,642 7.0 mi
Glenwood Springs 10,241 10.0 mi
Rifle 10,570 13.3 mi
Carbondale 6,637 20.8 mi
El Jebel 2,941 25.9 mi
Battlement Mesa 5,755 26.9 mi
Basalt 4,335 29.3 mi

More nearby: every ZIP code in Garfield County · Colorado ZIP codes

Cite this page

zipcodes.pro. “New Castle, CO ZIP codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/city/co/new-castle

Underlying data is public domain or openly licensed — sources, vintages and licences.