Residential delivery area · California
ZIP Code 95503: Eureka, CA
ZIP code 95503 uses the postal name Eureka, California and lies entirely in Humboldt County (Census 2020 ZIP-county file). About 25,000 people live there (Census Bureau, ACS 2020-2024), the more populous of Eureka's 2 residential ZIP codes. Median household income is $71,855 (Census Bureau, ACS 2020-2024). By Census place, its land lies in Pine Hills (12%), Humboldt Hill (5%), Cutten (2%), Bayview (under 1%) and Indianola (under 1%), and 5% in smaller places; 75% is outside any Census place.
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- Eureka · 2 residential ZIPs
- County
- Humboldt County
- Census places
- Pine Hills (12%) census-designated place; Humboldt Hill (5%) census-designated place; Cutten (2%) census-designated place; Bayview (under 1%) census-designated place
- Micro area
- Eureka-Arcata, CA
- House district
- CA-2 119th Congress
- State
- California
- Time zone
- Pacific
- Land area
- 83.7 sq mi · 299 people per sq mi
- PO Box ZIPs
- 95502 also use the name Eureka
Where is ZIP code 95503?
95503 centers on 40.738°, -124.108° and covers 83.7 square miles of land plus 0.9 of water. It borders 6 ZIP codes: 95501, 95537, 95564, 95524, 95551, 95549.
The map draws ZIP code areas only. For the streets inside 95503, 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 95503 compare with the rest of Eureka?
| Measure | 95503 | In Eureka | In Humboldt County | In CA |
|---|---|---|---|---|
| People (ACS 2020-2024) | 25,054 | 1st of 2 | 1st of 36 | 723rd of 1,802 |
| Median household income | $72k | 1st of 2 | 4th of 9 | 951st of 1,189 |
| Median home value | $445k | 1st of 2 | 12th of 17 | 1,025th of 1,317 |
Its median household income is higher than in 50% of U.S. residential ZIP codes, and it is denser than 67% 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 95503?
The 2020 Census counted 24,488 people in 95503; the ACS, which samples households over 2020-2024, estimates 25,054. Between the 2010 and 2020 censuses its population grew 1.4% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 25,054
- 2020 Census count
- 24,488+1.4% since 2010 (24,152)
- Households
- 9,982
- Median age
- 41.4
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 95503?
Of the 25,054 people the ACS estimates in 95503, 19.5% are under 18 and 22.7% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (71.5%), then Hispanic or Latino (12.5%).
- Under 1819.5%
- 18 to 6457.8%
- 65 and older22.7%
- White, not Hispanic71.5%
- Hispanic or Latino12.5%
- Other or two or more11.2%
- Asian, not Hispanic4.3%
- Black, not Hispanic0.6%
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 95503 earn?
Median household income is $71,855 (ACS 2020-2024), the 4th highest of the 9 ranked ZIP codes in Humboldt County. It is not measurably different from 2015-2019 ($67,329 in 2024 dollars): the change is within the surveys' margins of error.
- Median household income
- $71,855±$10,115
- Income per person
- $41,214
- Below the poverty line
- 13.8%
- Unemployed (of the labor force)
- 4.4%
- Adults 25+ with a bachelor's degree
- 29.1%
- Adjusted gross income per tax return, 2022
- $73,54110,400 returns; wages 60% 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 95503?
FHFA's house price index for 95503, built from repeat sales and appraisals of the same homes, rose 76% from 2015 to 2025 and rose 33% from 2020 to 2025, and moved +3.5% in 2025.
- Median home value (owners' estimate)
- $444,700
- Median gross rent
- $1,557
- Homes owned by their occupants
- 69.5%
- Housing units
- 10,677
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 95503?
335 business establishments had a location in this ZIP code in 2023, 3 fewer than in 2018; the most are in construction (ZIP Code Business Patterns).
- Construction82
- Health care and social assistance61
- Retail trade47
- Other services (except public administration)31
- Professional, scientific, and technical services23
- Accommodation and food services23
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 95503?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 95501 | Eureka | 22,890 | $54k | 4.8 mi |
| 95537 | Fields Landing | 532 | $79k | 5.9 mi |
| 95564 | Samoa | 444 | $79k | 6.2 mi |
| 95524 | Bayside | 1,634 | $88k | 6.4 mi |
| 95551 | Loleta | 1,880 | $65k | 7.8 mi |
| 95549 | Kneeland | 1,024 | $95k | 11.6 mi |
| 95521 | Arcata | 21,980 | $53k | 8.0 mi (near) |
| 95547 | Hydesville | 1,263 | $97k | 11.8 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.