Residential delivery area · Colorado
ZIP Code 80503: Longmont, CO
ZIP code 80503 uses the postal name Longmont, Colorado and lies mostly in Boulder County (98% of its land) with the rest in Larimer County (Census 2020 ZIP-county file). About 36,000 people live there (Census Bureau, ACS 2020-2024), the least populous of Longmont's 3 residential ZIP codes. Median household income is $113,620 (Census Bureau, ACS 2020-2024). By Census place, its land lies in Longmont (9%) and Niwot (4%), and 1% in smaller places; 86% is outside any Census place.
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- Longmont · 3 residential ZIPs
- County
- Boulder County (98%); Larimer County (2%)
- Census places
- Longmont (9%); Niwot (4%) census-designated place
- Metro area
- Boulder, CO
- House district
- CO-2 119th Congress
- State
- Colorado
- Time zone
- Mountain
- Land area
- 91.7 sq mi · 391 people per sq mi
- PO Box ZIPs
- 80502 also use the name Longmont
Where is ZIP code 80503?
80503 centers on 40.169°, -105.210° and covers 91.7 square miles of land plus 3.0 of water. It borders 8 ZIP codes: 80544, 80501, 80301, 80504, 80513, 80540, 80302, 80537.
The map draws ZIP code areas only. For the streets inside 80503, open its center on OpenStreetMap.
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries and the 2023 Gazetteer (2020 ZCTAs); ZIP-to-county shares, Census places and House districts (119th Congress) from the Census 2020 relationship files (shares of land); metro area from the OMB delineation (July 2023); town name and time zone from simplemaps US ZIP Codes (CC BY 4.0).
How does 80503 compare with the rest of Longmont?
| Measure | 80503 | In Longmont | In Boulder County | In CO |
|---|---|---|---|---|
| People (ACS 2020-2024) | 35,846 | 3rd of 3 | 5th of 23 | 51st of 527 |
| Median household income | $114k | 2nd of 3 | 11th of 15 | 71st of 277 |
| Median home value | $756k | 1st of 3 | 9th of 16 | 44th of 311 |
Its median household income is higher than in 88% of U.S. residential ZIP codes, and it is denser than 70% of all U.S. residential ZIP codes. ZIP codes at the ACS caps ($250,000 or more for household income, $2,000,000 or more for home value) share the top rank.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B19013, B25077); ranks by PlainZIP over residential ZIP codes (ZCTAs).
How many people live in 80503?
The 2020 Census counted 35,863 people in 80503; the ACS, which samples households over 2020-2024, estimates 35,846. Between the 2010 and 2020 censuses its population grew 15.4% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 35,846
- 2020 Census count
- 35,863+15.4% since 2010 (31,064)
- Households
- 15,153
- Median age
- 44.8
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B01002, B11001); 2020 Census (DHC P1); 2010 Census (SF1 P1).
Who lives in 80503?
Of the 35,846 people the ACS estimates in 80503, 18.9% are under 18 and 20.7% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (78.3%), then Hispanic or Latino (10.2%).
- Under 1818.9%
- 18 to 6460.4%
- 65 and older20.7%
- White, not Hispanic78.3%
- Hispanic or Latino10.2%
- Other or two or more5.9%
- Asian, not Hispanic5.1%
- Black, not Hispanic0.5%
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01001 age by sex, B03002 Hispanic or Latino origin by race); shares of the estimated population, small ZIP codes carry wide margins.
What do households in 80503 earn?
Median household income is $113,620 (ACS 2020-2024), the 11th highest of the 15 ranked ZIP codes in Boulder County. It is not measurably different from 2015-2019 ($119,455 in 2024 dollars): the change is within the surveys' margins of error.
- Median household income
- $113,620
- Income per person
- $64,526
- Below the poverty line
- 5.8%
- Unemployed (of the labor force)
- 3.5%
- Adults 25+ with a bachelor's degree
- 59.9%
- Adjusted gross income per tax return, 2022
- $147,34017,690 returns; wages 58% of AGI (IRS)
Source: U.S. Census Bureau, ACS 2020-2024 and 2015-2019 5-year estimates (B19013, B19301, B17001, B23025, B15003; 2015-2019 dollars converted with the BLS CPI-U, 1.22699); IRS Statistics of Income, ZIP code data, tax year 2022 (adjusted gross income per return, filed under the address on the return).
What are homes worth in 80503?
FHFA's house price index for 80503, built from repeat sales and appraisals of the same homes, rose 90% from 2015 to 2025 and rose 38% from 2020 to 2025, and moved +0.3% in 2025.
- Median home value (owners' estimate)
- $755,500
- Median gross rent
- $1,872
- Homes owned by their occupants
- 66.1%
- Housing units
- 15,737
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B25077, B25064, B25003, B25001); FHFA House Price Index, annual five-digit ZIP, updated 2026-03-31.
What businesses are in 80503?
767 business establishments had a location in this ZIP code in 2023, 53 more than in 2018; the most are in professional, scientific, and technical services (ZIP Code Business Patterns).
- Professional, scientific, and technical services195
- Construction88
- Health care and social assistance81
- Real estate and rental and leasing68
- Other services (except public administration)52
- Administrative and support and waste management and remediation services38
Source: U.S. Census Bureau, ZIP Code Business Patterns 2023 and 2018 (establishments with paid employees, by the business's ZIP code).
Which ZIP codes are next to 80503?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 80544 | Niwot | 0 | – | 5.0 mi |
| 80501 | Longmont | 44,147 | $81k | 5.7 mi |
| 80301 | Boulder | 25,007 | $95k | 8.5 mi |
| 80504 | Longmont | 63,451 | $114k | 9.6 mi |
| 80513 | Berthoud | 18,271 | $127k | 10.2 mi |
| 80540 | Lyons | 4,642 | $140k | 10.7 mi |
| 80302 | Boulder | 29,569 | $62k | 12.3 mi |
| 80537 | Loveland | 44,425 | $86k | 14.8 mi |
| 80304 | Boulder | 25,383 | $127k | 9.5 mi (near) |
| 80455 | Jamestown | 501 | $169k | 11.1 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.