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US ZIP Code Profile

ZIP Code 80121
Littleton, Colorado

ZIP code 80121 is in Littleton, located in Arapahoe County, Colorado, within the Denver-Aurora-Lakewood metro area. Its 2020 Census population was 18,176. The estimated median adjusted gross income per tax return is $88,343, and about 23% of filers report $200,000 or more.

2020 Population
18,176
Census ZCTA
County
Arapahoe
FIPS 08005
Median income (est.)
$88,343
IRS SOI 2022
Land Area
7.489 mi²
+ 0.021 mi² water

01Location & Geography

Authoritative geographic identifiers from the U.S. Census Bureau, ANSI, and FIPS standards.

Primary CityLittleton, CO
CountyArapahoe County (FIPS 08005)
StateColorado (FIPS 08)
Metro Area (MSA)Denver-Aurora-Lakewood, CO Metro Area (19740)
Census Region / DivisionWest Region · Mountain Division
Coordinates39.610703, -104.94901
Land / Water Area7.489 mi² land · 0.021 mi² water

02Income & Economics

Distribution of the 9,190 individual tax returns filed in 80121 by adjusted gross income bracket (IRS SOI, 2022).

< $25K
19.1%
$25K–$50K
13.7%
$50K–$75K
12.0%
$75K–$100K
9.7%
$100K–$200K
22.9%
$200K+
22.6%
The $200,000+ bracket accounts for 79% of 80121's total adjusted gross income, from 23% of returns — a concentration that drives the gap between the median ($88,343) and the average.
Estimated median = median adjusted gross income per tax return, interpolated from IRS SOI brackets. Differs from U.S. Census household income.

03Income Over Time

Year-over-year change in 80121's IRS income metrics, 2020–2022.

Median income (2021→2022)
$88,343
▲ 2.0%
Filers earning $200K+
22.6%
▲ 0.5 pt
Total filers
9,190
▼ 0.6%
GET /zipc/v2/zipcodes/80121/soi?year=… $76K 2020 $87K 2021 $88K 2022
Median = adjusted gross income per return, interpolated from IRS SOI brackets. Figures are nominal (not inflation-adjusted).

04Population Trend

Decennial U.S. Census population for the 80121 ZCTA.

2000
18,258
 
2010
17,853
▼ -2.2%
2020
18,176
▲ +1.8%

05Nearby ZIP Codes — Live Radius Search

Drag the slider to filter ZIP codes by distance from 80121. Powered by the same radius endpoint developers call from the API.

GET /zipc/v2/radius

ZIP codes within range of 80121

Littleton and its immediate neighbors, sorted by distance.

3 mi
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Distance from 80121 to any ZIP

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06USPS Postal Details

Delivery and facility attributes from the monthly USPS dataset.

ZIP ClassificationNon-Unique Zip
Facility TypePost Office
Carrier Route SortB
USPS Finance Number075580
City AliasesGreenwood Village, Cherry Hills Village, Littleton, Centennial, Greenwood Vlg, Cherry Hl Vlg, Cherry Hills, Grants Ranch

07Frequently Asked Questions

What county is ZIP code 80121 in?

ZIP code 80121 is in Arapahoe County, Colorado (county FIPS code 08005).

What city is ZIP code 80121?

The primary USPS city for 80121 is Littleton, CO.

What metro area (MSA) is 80121 in?

80121 is part of the Denver-Aurora-Lakewood, CO Metro Area (MSA code 19740).

What is the population of ZIP code 80121?

The 2020 Census population of 80121 was 18,176 residents.

What is the median income in ZIP code 80121?

Based on IRS Statistics of Income data, the estimated median adjusted gross income per tax return in 80121 is about $88,343, with around 23% of filers reporting $200,000 or more. Note that adjusted gross income is a tax measure and differs from U.S. Census household income.