Guatay, CA · standard
ZIP Code 91931
San Diego County, California - Census ACS demographics, housing tenure, and business patterns, benchmarked against every US ZIP.
- 592
- 16/sq mi Moderate-density area
- $63,750
- Median income Near-median income area
- 22.6%
- Bachelor's or higher Near-average bachelor's attainment
National ZIP placement
Guatay pairs a below-median household income, in a rural, homeowner-dominated area.
- 36th pct
- household income, US ZIPs
- 16
- people per sq mi
- 81%
- owner-occupied homes
Source: U.S. Census Bureau ACS 5-Year Estimates (2019–2023). Percentiles rank ZIP 91931 against every reporting US ZIP.
ZIP code 91931 is a sparsely populated ZIP (a standard USPS delivery area) in Guatay, San Diego County, California, home to just 592 residents across 37.5 square miles, a density of 16 people per square mile, in the Los Angeles time zone.
ZIP 91931 reports a modest median household income of $63,750 (37% below the average California ZIP), while per-capita income is $34,239. Both reported hardship measures are comparatively low in absolute terms: poverty is 3.6% and unemployment is 0.0%. The ACS does not report a median home value for this ZIP, so housing cost context is limited to the available tenure and rent fields.
Educational attainment sits below the national norm: 22.6% of adults hold a bachelor's degree or higher, the median age is 65.2, and the average commute is -. The page also surfaces 3 ZIP codes within roughly 10 miles and 6 more in San Diego County, so 91931 can be compared with both its immediate and county-level context.
Every figure on this page is sourced from the U.S. Census Bureau American Community Survey 5-Year Estimates (including median rent) and the FHFA House Price Index, no estimates, no proprietary scoring. Verify with Census →
Source: U.S. Census Bureau, American Community Survey 5-Year Estimates + ZIP Code Business Patterns + FHFA HPI ACS demographics and median rent, ZBP business establishments, FHFA HPI for ZIP 91931, Guatay, CA · 2023 Census ACS 5-Year Estimates use a rolling 60-month sample for stable small-geography estimates; ZBP updated annually; FHFA HPI updated quarterly/annually.
Quick Facts
592
Population
37.5
Area (sq mi)
16
People / sq mi
Los Angeles
Time Zone
standard
ZIP Type
Who lives in ZIP 91931?
65.2
Median Age
43.5%
Male
56.5%
Female
19.4%
Foreign-Born
Hispanic or Latino is an ethnicity category from the Census Bureau and may overlap with other categories above.
Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)
How much do residents earn?
$63,750
Median Household Income
-37% vs state ZIP avg
$34,239
Per Capita Income
3.6%
Poverty Rate
0.0%
Unemployment Rate
How ZIP 91931 ranks among California ZIPs
Guatay, CA household income vs. every California ZIP code
Median household income among 1,583 reporting California ZIPs (this ZIP's population is too small for a reliable national-corpus placement)
$63,750 18th percentile higher than 18% of 1,583 California ZIPs
Each bar is a $20K-wide band; taller bars hold more California ZIPs. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
Source U.S. Census Bureau, ACS 5-Year Estimates · 2019–2023
Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)
What is the education profile here?
Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)
What does housing look like?
Housing stock: occupied vs vacant
270housing units
270
Total Housing Units
242
Occupied Units
28
Vacant Units
2.04
Avg Household Size
Occupancy Type
1989
Median Year Built
Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)
What businesses operate in this ZIP?
Census Bureau data shows 12 business establishments in ZIP 91931, employing approximately 59 people with a combined annual payroll of $3,535,000.
12
Businesses
59
Employees
$3.5M
Annual Payroll
1
Industry Sectors
| Industry | Establishments | % of Total |
|---|---|---|
| Construction | 4 | 33.3% |
Source: U.S. Census Bureau, ZIP Code Business Patterns (ZBP), 2023. Employment figures may include noise for disclosure avoidance.
Nearby ZIP Codes
Want a side-by-side? Compare 91931 vs 91916 →
ZIP 91931 vs its nearest neighbors, by population
Resident population of this ZIP and the closest reporting ZIP codes within ~10 miles.
- 91962
Pine Valley (91962)
1,646 residents
- 91916
Descanso (91916)
1,622 residents
- 91931 592
Guatay (91931)
592 residents
- 91948 78
Mount Laguna (91948)
78 residents
What this shows Among its immediate neighbors, ZIP 91931 ranks #3 by population - useful context the national average alone can't give.
ZIP 91931 vs its nearest neighbors, by median income
Median household income of this ZIP and the closest reporting ZIP codes within ~10 miles.
- 91962
Pine Valley (91962)
$143,094 median income
- 91916
Descanso (91916)
$103,438 median income
- 91931
Guatay (91931)
$63,750 median income
- 91948 $55,066
Mount Laguna (91948)
$55,066 median income
What this shows By household income, ZIP 91931 ranks #3 of 4 neighboring ZIPs, local affluence varies block to block, not just metro to metro.
Nationwide ZIPs with similar ACS profiles
Two Census-derived peer sets for ZIP 91931, both outside CA so the neighborhoods are not geographic containment (Nearby and same-county blocks stay local).
Similar median household income
Nearest cross-state ZIPs by ACS median household income.
More ZIP Codes in San Diego County
Related Areas
Frequently Asked Questions
What county is ZIP code 91931 in?
ZIP code 91931 (Guatay) is located in San Diego County, California. San Diego County contains multiple ZIP codes, see the full list at /counties/san-diego-ca.
What is the population of ZIP code 91931?
ZIP code 91931 in Guatay, CA has a population of 592 according to the Census Bureau ACS 2023 estimates.
What is the median household income in ZIP 91931?
The median household income in ZIP 91931 is $63,750, which is 16% below the national average of $76,288.
What is the demographic makeup of ZIP 91931?
The largest racial group in ZIP 91931 is White at 54.5%. Hispanic or Latino residents make up 48.0% of the population.
How many businesses are in ZIP code 91931?
ZIP code 91931 has 12 business establishments employing approximately 59 people, according to Census Bureau ZIP Code Business Patterns (ZBP) 2023 data.
What is the education level in ZIP code 91931?
In ZIP code 91931, 32.0% of residents aged 25+ have a high school diploma or higher, and 22.6% hold a bachelor's degree or higher. These figures come from the Census Bureau ACS 5-Year Estimates (2023).
What percentage of residents own vs. rent in ZIP 91931?
In ZIP code 91931, approximately 81.4% of occupied housing units are owner-occupied and 18.6% are renter-occupied, based on Census ACS 2023 data.
What is the poverty rate in ZIP code 91931?
The poverty rate in ZIP code 91931 is 3.6% according to Census Bureau ACS 2023 estimates. This measures the percentage of the population living below the federal poverty threshold.
Related
Take this with you
What to do with ZIP 91931's numbers, next.
- See how ZIP 91931 compares to a neighboring ZIP code on the same Census fields Compare this ZIP
- Check where Guatay, CA ranks among every U.S. ZIP code on income, education, or homeownership View national rankings
- Save this ZIP to your shortlist to track alongside others you're considering View your shortlist
ZIP Code Tabulation Areas (ZCTAs) are Census Bureau approximations of USPS ZIP codes; figures describe the ZCTA area, not any single address within it.