| City: | Littleton, Colorado |
| Names to Avoid: | Arapahoe County Offices |
| County: | Arapahoe County |
| Timezone: | Mountain (GMT -07:00) |
| Local Time: | 8:54:27 PM |
| Population: | No Population Data |
| Area Codes: | 720 / 983 |
| Classification: | Unique [Company/Government] |
| Coordinates: | 39.6135, -105.0164 |
| Quick Link: |
Arapahoe County government operates under dedicated ZIP code 80166 in Historic Downtown Littleton, Colorado. Established in 1861, Arapahoe County was one of Colorado's original 17 counties when the territory was created. Named for the Arapaho Native Americans who occupied the region from the 1820s through the late 1860s, the county originally stretched from present-day Sheridan Boulevard 160 miles east to the Kansas border. After Denver became an independent city-county in 1902, Littleton was designated the new county seat.
Today Arapahoe County serves more than 650,000 residents across 805 square miles, making it Colorado's third most populous county. The five-member Board of County Commissioners serves as the administrative and policy-making body. This unique postal designation has served county operations for more than twenty years. Two delivery codes route mail to county facilities. Census demographic data is not available. Littleton is the valid mailing city.
| Residential: | 0 |
| Business: | 1 |
Buildings registered in the USPS ZIP+4 database with designated codes for direct mail delivery.
ZIP Code 80166 is assigned to a single organization or institution. Detailed business demographics are not published for unique ZIP Codes. USPS data shows 0 residential mailboxes and 1 business mailboxes, reflecting local delivery coverage.
| # Residential Mailboxes: | 0Source: USPS |
| # Business Mailboxes: | 1Source: USPS |
| Total Delivery Receptacles: | 1Source: USPS |
| Single Family Delivery Units: | 0Source: USPS |
| Multi Family Delivery Units: | 0Source: USPS |
| # of Businesses: | 0Source: CBP |
| 1st Quarter Payroll: | $0Source: CBP |
| Annual Payroll: | $0Source: CBP |
| # of Employees: | 0Source: CBP |
ZIP Code 80166 is located in Arapahoe County, Colorado, within the Denver-Aurora-Centennial, CO Metropolitan Statistical Area (CBSA 19740) and Colorado's 6th Congressional District. This Metro area has a population of 2,977,085 people, about 0.00% of whom live in ZIP Code 80166. It covers 0 sq mi of land and a water area of 0 sq mi.
| CBSA Name: | Denver-Aurora-Centennial, COSource: Census |
| CBSA Number: | 19740Source: Census |
| CBSA Type: | MetroSource: Census |
| CBSA Division: | --Source: Census |
| CBSA Population: | 2,977,085Source: Census |
| MSA: | Denver-Boulder-Greeley, CO CMSASource: Census |
| Land Area: | --Source: Census |
| Water Area: | --Source: Census |
| Congressional District: | 06Source: USPS |
| Congressional Land Area: | 474.66 sq miSource: Census |
| PMSA: | Denver, CO PMSASource: Census |
| Intro Date: | < 2004-10Source: ZIP-Codes.com |
| Place FIPS Code: | 0845255Source: Census |
| Place Name: | Littleton city; ColoradoSource: Census |
We could not locate which school district 80166 belongs to, but we will update this once new district data is released. There are no public schools nor private schools with a mailing address in this ZIP Code. Listing Nearby schools instead. It also has 6 colleges, universities or post secondary education institutions nearby which would be a short commute to.
Our sources include trusted federal and licensed data from the United States Postal Service, U.S. Census Bureau, U.S. Geological Survey, Centers for Medicare & Medicaid Services, and the National Center for Education Statistics, along with proprietary datasets created by ZIP-Codes.com. Data last updated on January 1, 2026.