Residential delivery area · California
ZIP Code 91731: El Monte, CA
ZIP code 91731 is in El Monte, California, entirely in Los Angeles County (Census 2020 ZIP-county file). About 28,000 people live there (Census Bureau, ACS 2020-2024), the less populous of El Monte's 2 residential ZIP codes. Median household income is $62,215 (Census Bureau, ACS 2020-2024).
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- El Monte · 2 residential ZIPs
- County
- Los Angeles County
- Census places
- El Monte
- Metro area
- Los Angeles-Long Beach-Anaheim, CA
- House district
- CA-31 119th Congress
- State
- California
- Time zone
- Pacific
- Land area
- 3.8 sq mi · 7,278 people per sq mi
Where is ZIP code 91731?
91731 centers on 34.079°, -118.043° and covers 3.8 square miles of land plus 0.1 of water. It borders 5 ZIP codes: 91732, 91780, 91733, 91770, 91006.
The map draws ZIP code areas only. For the streets inside 91731, 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 91731 compare with the rest of El Monte?
| Measure | 91731 | In El Monte | In Los Angeles County | In CA |
|---|---|---|---|---|
| People (ACS 2020-2024) | 27,620 | 2nd of 2 | 175th of 301 | 657th of 1,802 |
| Median household income | $62k | 2nd of 2 | 237th of 265 | 1,061st of 1,189 |
| Median home value | $636k | 2nd of 2 | 225th of 273 | 759th of 1,317 |
Its median household income is higher than in 33% of U.S. residential ZIP codes, and it is denser than 96% 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 91731?
The 2020 Census counted 28,197 people in 91731; the ACS, which samples households over 2020-2024, estimates 27,620. Between the 2010 and 2020 censuses its population fell 4.7% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 27,620
- 2020 Census count
- 28,197−4.7% since 2010 (29,591)
- Households
- 8,293
- Median age
- 36.6
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 91731?
Of the 27,620 people the ACS estimates in 91731, 23.3% are under 18 and 17.4% are 65 or older. The largest group by race and Hispanic origin is Hispanic or Latino (67.1%), then Asian (not Hispanic) (27.4%).
- Under 1823.3%
- 18 to 6459.3%
- 65 and older17.4%
- Hispanic or Latino67.1%
- Asian, not Hispanic27.4%
- White, not Hispanic3.4%
- Other or two or more1.6%
- 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 91731 earn?
Median household income is $62,215 (ACS 2020-2024), the 237th highest of the 265 ranked ZIP codes in Los Angeles County. It rose from $51,893 in 2015-2019 (in 2024 dollars), a change larger than the surveys' margins of error.
- Median household income
- $62,215
- Income per person
- $24,216
- Below the poverty line
- 17.8%
- Unemployed (of the labor force)
- 6.2%
- Adults 25+ with a bachelor's degree
- 15.2%
- Adjusted gross income per tax return, 2022
- $48,08012,130 returns; wages 82% 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 91731?
FHFA's house price index for 91731, built from repeat sales and appraisals of the same homes, rose 91% from 2015 to 2025 and rose 47% from 2020 to 2025, and moved +4.3% in 2025.
- Median home value (owners' estimate)
- $635,600
- Median gross rent
- $1,669
- Homes owned by their occupants
- 39.6%
- Housing units
- 8,648
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 91731?
1,102 business establishments had a location in this ZIP code in 2023, 18 fewer than in 2018; the most are in wholesale trade (ZIP Code Business Patterns).
- Wholesale trade180
- Retail trade139
- Transportation and warehousing114
- Health care and social assistance112
- Professional, scientific, and technical services95
- Accommodation and food services88
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 91731?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 91732 | El Monte | 57,431 | $75k | 1.7 mi |
| 91780 | Temple City | 35,588 | $104k | 1.7 mi |
| 91733 | South El Monte | 41,255 | $68k | 2.3 mi |
| 91770 | Rosemead | 58,382 | $75k | 2.4 mi |
| 91006 | Arcadia | 31,582 | $124k | 4.0 mi |
| 91776 | San Gabriel | 36,952 | $82k | 3.0 mi (near) |
| 91007 | Arcadia | 33,029 | $101k | 3.4 mi (near) |
| 91775 | San Gabriel | 23,672 | $119k | 3.6 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.