Residential delivery area · California
ZIP Code 91384: Castaic, CA
ZIP code 91384 uses the postal name Castaic, California and lies entirely in Los Angeles County (Census 2020 ZIP-county file). About 26,000 people live there (Census Bureau, ACS 2020-2024). Median household income is $131,689 (Census Bureau, ACS 2020-2024). By Census place, its land lies in Castaic (7%), Hasley Canyon (6%) and Val Verde (3%); 85% is outside any Census place.
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- Castaic · its only residential ZIP
- County
- Los Angeles County
- Census places
- Castaic (7%) census-designated place; Hasley Canyon (6%) census-designated place; Val Verde (3%) census-designated place
- Metro area
- Los Angeles-Long Beach-Anaheim, CA
- House district
- CA-27 119th Congress
- State
- California
- Time zone
- Pacific
- Land area
- 103.6 sq mi · 256 people per sq mi
- PO Box ZIPs
- 91310 also use the name Castaic
Where is ZIP code 91384?
91384 centers on 34.520°, -118.668° and covers 103.6 square miles of land plus 0.8 of water. It borders 5 ZIP codes: 91354, 91355, 91381, 91390, 93040.
The map draws ZIP code areas only. For the streets inside 91384, 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 91384 compare with the rest of Los Angeles County?
| Measure | 91384 | In Los Angeles County | In CA |
|---|---|---|---|
| People (ACS 2020-2024) | 26,478 | 186th of 301 | 692nd of 1,802 |
| Median household income | $132k | 42nd of 265 | 265th of 1,189 |
| Median home value | $767k | 177th of 273 | 613th of 1,317 |
Its median household income is higher than in 93% of U.S. residential ZIP codes, and it is denser than 65% 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 91384?
The 2020 Census counted 28,585 people in 91384; the ACS, which samples households over 2020-2024, estimates 26,478. Its boundary changed between the 2010 and 2020 censuses, so the two counts are not compared.
- People, ACS 2020-2024
- 26,478
- 2020 Census count
- 28,585
- Households
- 7,124
- Median age
- 35.8
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 91384?
Of the 26,478 people the ACS estimates in 91384, 23.1% are under 18 and 10.5% are 65 or older. The largest group by race and Hispanic origin is Hispanic or Latino (43.4%), then White (not Hispanic) (37.3%).
- Under 1823.1%
- 18 to 6466.4%
- 65 and older10.5%
- Hispanic or Latino43.4%
- White, not Hispanic37.3%
- Asian, not Hispanic7.8%
- Other or two or more6.4%
- Black, not Hispanic5.1%
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 91384 earn?
Median household income is $131,689 (ACS 2020-2024), the 42nd highest of the 265 ranked ZIP codes in Los Angeles County.
- Median household income
- $131,689
- Income per person
- $41,792
- Below the poverty line
- 5.7%
- Unemployed (of the labor force)
- 5.3%
- Adults 25+ with a bachelor's degree
- 32.3%
- Adjusted gross income per tax return, 2022
- $96,82311,110 returns; wages 79% 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 91384?
FHFA's house price index for 91384, built from repeat sales and appraisals of the same homes, rose 75% from 2015 to 2025 and rose 39% from 2020 to 2025, and moved +1.9% in 2025.
- Median home value (owners' estimate)
- $767,300
- Median gross rent
- $1,745
- Homes owned by their occupants
- 84.1%
- Housing units
- 7,270
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 91384?
343 business establishments had a location in this ZIP code in 2023, 50 more than in 2018; the most are in construction (ZIP Code Business Patterns).
- Construction61
- Professional, scientific, and technical services44
- Accommodation and food services41
- Real estate and rental and leasing36
- Retail trade28
- Administrative and support and waste management and remediation services27
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 91384?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 91354 | Valencia | 33,957 | $156k | 7.8 mi |
| 91355 | Valencia | 29,123 | $116k | 9.9 mi |
| 91381 | Stevenson Ranch | 22,582 | $159k | 10.7 mi |
| 91390 | Santa Clarita | 19,308 | $152k | 10.7 mi |
| 93040 | Piru | 1,799 | $95k | 20.8 mi |
| 91350 | Santa Clarita | 43,973 | $140k | 11.3 mi (near) |
| 91351 | Canyon Country | 33,155 | $115k | 13.4 mi (near) |
| 93015 | Fillmore | 19,191 | $93k | 13.8 mi (near) |
| 93532 | Lake Hughes | 2,930 | $113k | 14.0 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.
Which other ZIP codes use the name Castaic?
1 more ZIP code carries the postal name Castaic, CA without a residential delivery area: PO boxes at the post office, or a single organization with its own ZIP code. The Census Bureau publishes no figures for it.
| ZIP | County |
|---|---|
| 91310 | Los Angeles County |
Source: GeoNames postal codes (CC BY 4.0), downloaded 2026-10-09; a ZIP code with no Census ZCTA has no residential delivery area.