Residential delivery area · California
ZIP Code 93420: Arroyo Grande, CA
ZIP code 93420 uses the postal name Arroyo Grande, California and lies entirely in San Luis Obispo County (Census 2020 ZIP-county file). About 31,000 people live there (Census Bureau, ACS 2020-2024). Median household income is $110,553 (Census Bureau, ACS 2020-2024). By Census place, its land lies in Arroyo Grande (3%), Los Berros (1%) and Callender (1%); 94% is outside any Census place.
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- Arroyo Grande · its only residential ZIP
- County
- San Luis Obispo County
- Census places
- Arroyo Grande (3%); Los Berros (1%) census-designated place; Callender (1%) census-designated place
- Neighborhood
- ARroyo Trailer Park GeoNames
- Metro area
- San Luis Obispo-Paso Robles, CA
- House district
- CA-24 119th Congress
- State
- California
- Time zone
- Pacific
- Land area
- 197.4 sq mi · 159 people per sq mi
- PO Box ZIPs
- 93421 also use the name Arroyo Grande
Where is ZIP code 93420?
93420 centers on 35.176°, -120.477° and covers 197.4 square miles of land plus 1.2 of water. It borders 7 ZIP codes: 93401, 93433, 93444, 93449, 93445, 93453, 93454.
The map draws ZIP code areas only. For the streets inside 93420, 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); neighborhoods from the GeoNames gazetteer (CC BY 4.0), placed in this ZIP code by PlainZIP.
How does 93420 compare with the rest of San Luis Obispo County?
| Measure | 93420 | In San Luis Obispo County | In CA |
|---|---|---|---|
| People (ACS 2020-2024) | 31,345 | 4th of 28 | 582nd of 1,802 |
| Median household income | $111k | 4th of 16 | 446th of 1,189 |
| Median home value | $918k | 7th of 21 | 416th of 1,317 |
Its median household income is higher than in 87% of U.S. residential ZIP codes, and it is denser than 60% 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 93420?
The 2020 Census counted 30,540 people in 93420; the ACS, which samples households over 2020-2024, estimates 31,345. Between the 2010 and 2020 censuses its population grew 7.5% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 31,345
- 2020 Census count
- 30,540+7.5% since 2010 (28,413)
- Households
- 12,672
- Median age
- 48.2
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 93420?
Of the 31,345 people the ACS estimates in 93420, 19.7% are under 18 and 28.5% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (66.4%), then Hispanic or Latino (21.3%).
- Under 1819.7%
- 18 to 6451.8%
- 65 and older28.5%
- White, not Hispanic66.4%
- Hispanic or Latino21.3%
- Other or two or more8.2%
- Asian, not Hispanic3.6%
- 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 93420 earn?
Median household income is $110,553 (ACS 2020-2024), the 4th highest of the 16 ranked ZIP codes in San Luis Obispo County. It is not measurably different from 2015-2019 ($104,970 in 2024 dollars): the change is within the surveys' margins of error.
- Median household income
- $110,553
- Income per person
- $53,468
- Below the poverty line
- 6.4%
- Unemployed (of the labor force)
- 4.5%
- Adults 25+ with a bachelor's degree
- 44.1%
- Adjusted gross income per tax return, 2022
- $121,77014,130 returns; wages 49% 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 93420?
FHFA's house price index for 93420, built from repeat sales and appraisals of the same homes, rose 75% from 2015 to 2025 and rose 45% from 2020 to 2025, and moved +4.1% in 2025.
- Median home value (owners' estimate)
- $917,900
- Median gross rent
- $2,187
- Homes owned by their occupants
- 66.4%
- Housing units
- 13,618
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 93420?
888 business establishments had a location in this ZIP code in 2023, 81 more than in 2018; the most are in health care and social assistance (ZIP Code Business Patterns).
- Health care and social assistance136
- Construction134
- Professional, scientific, and technical services105
- Retail trade92
- Other services (except public administration)78
- Accommodation and food services77
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 93420?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 93401 | San Luis Obispo | 29,202 | $97k | 8.9 mi |
| 93433 | Grover Beach | 12,600 | $87k | 8.9 mi |
| 93444 | Nipomo | 21,611 | $111k | 9.8 mi |
| 93449 | Pismo Beach | 8,014 | $118k | 10.0 mi |
| 93445 | Oceano | 6,857 | $72k | 12.2 mi |
| 93453 | Santa Margarita | 2,344 | $78k | 15.2 mi |
| 93454 | Santa Maria | 41,896 | $82k | 21.4 mi |
| 93410 | San Luis Obispo | 7,396 | – | 13.5 mi (near) |
| 93407 | San Luis Obispo | 347 | – | 14.1 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 Arroyo Grande?
1 more ZIP code carries the postal name Arroyo Grande, 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 |
|---|---|
| 93421 | San Luis Obispo 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.