Residential delivery area · Colorado
ZIP Code 80303: Boulder, CO
ZIP code 80303 uses the postal name Boulder, Colorado and lies entirely in Boulder County (Census 2020 ZIP-county file). About 25,000 people live there (Census Bureau, ACS 2020-2024), the 4th most populous of Boulder's 6 residential ZIP codes. Median household income is $78,555 (Census Bureau, ACS 2020-2024). By Census place, its land lies in Boulder (18%), Paragon Estates (8%) and Eldorado Springs (6%); 68% is outside any Census place.
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- Boulder · 6 residential ZIPs
- County
- Boulder County
- Census places
- Boulder (18%); Paragon Estates (8%) census-designated place; Eldorado Springs (6%) census-designated place
- Metro area
- Boulder, CO
- House district
- CO-2 119th Congress
- State
- Colorado
- Time zone
- Mountain
- Land area
- 21.9 sq mi · 1,142 people per sq mi
Where is ZIP code 80303?
80303 centers on 39.973°, -105.209° and covers 21.9 square miles of land plus 0.9 of water. It borders 9 ZIP codes: 80305, 80027, 80310, 80301, 80025, 80026, 80007, 80302, 80403.
The map draws ZIP code areas only. For the streets inside 80303, 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 80303 compare with the rest of Boulder?
| Measure | 80303 | In Boulder | In Boulder County | In CO |
|---|---|---|---|---|
| People (ACS 2020-2024) | 24,996 | 4th of 6 | 11th of 23 | 99th of 527 |
| Median household income | $79k | 4th of 5 | 14th of 15 | 187th of 277 |
| Median home value | $962k | 4th of 5 | 4th of 16 | 9th of 311 |
Its median household income is higher than in 60% of U.S. residential ZIP codes, and it is denser than 79% 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 80303?
The 2020 Census counted 25,328 people in 80303; the ACS, which samples households over 2020-2024, estimates 24,996. Between the 2010 and 2020 censuses its population grew 13.3% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 24,996
- 2020 Census count
- 25,328+13.3% since 2010 (22,361)
- Households
- 11,783
- Median age
- 29.3
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 80303?
Of the 24,996 people the ACS estimates in 80303, 10.8% are under 18 and 16.4% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (78.9%).
- Under 1810.8%
- 18 to 6472.8%
- 65 and older16.4%
- White, not Hispanic78.9%
- Hispanic or Latino7.8%
- Asian, not Hispanic7.2%
- Other or two or more5.4%
- Black, not Hispanic0.7%
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 80303 earn?
Median household income is $78,555 (ACS 2020-2024), the 14th highest of the 15 ranked ZIP codes in Boulder County. It is not measurably different from 2015-2019 ($76,591 in 2024 dollars): the change is within the surveys' margins of error.
- Median household income
- $78,555
- Income per person
- $62,355
- Below the poverty line
- 23.1%
- Unemployed (of the labor force)
- 4.8%
- Adults 25+ with a bachelor's degree
- 80.1%
- Adjusted gross income per tax return, 2022
- $146,76710,970 returns; wages 52% 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 80303?
FHFA's house price index for 80303, built from repeat sales and appraisals of the same homes, rose 71% from 2015 to 2025 and rose 33% from 2020 to 2025, and moved −1.8% in 2025.
- Median home value (owners' estimate)
- $961,900
- Median gross rent
- $1,910
- Homes owned by their occupants
- 43.9%
- Housing units
- 12,809
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 80303?
944 business establishments had a location in this ZIP code in 2023, 13 fewer than in 2018; the most are in professional, scientific, and technical services (ZIP Code Business Patterns).
- Professional, scientific, and technical services228
- Health care and social assistance157
- Other services (except public administration)86
- Real estate and rental and leasing75
- Retail trade63
- Finance and insurance56
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 80303?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 80305 | Boulder | 16,291 | $126k | 2.1 mi |
| 80027 | Louisville | 34,127 | $154k | 3.1 mi |
| 80310 | Boulder | 7,692 | – | 3.5 mi |
| 80301 | Boulder | 25,007 | $95k | 5.0 mi |
| 80025 | Eldorado Springs | 138 | $134k | 5.8 mi |
| 80026 | Lafayette | 32,701 | $120k | 6.4 mi |
| 80007 | Arvada | 19,078 | $176k | 7.4 mi |
| 80302 | Boulder | 29,569 | $62k | 8.2 mi |
| 80403 | Golden | 20,732 | $151k | 11.5 mi |
| 80304 | Boulder | 25,383 | $127k | 6.5 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.