91931 ZIP Code — Guatay, CA

San Diego County, California

ZIP code 91931 is located in Guatay, California, within San Diego County. It covers approximately 8.21 square miles and serves a population of 749 residents. This is a standard ZIP code in the Pacific (PT) timezone, served by area code 619.

About ZIP code 91931

The housing stock consists of a higher-than-average concentration of mobile homes. Most homes were built in the 2000s, giving the area an established character. Owner-occupancy is high at 86%, well above the national average.

Median household income is $56,518. Poverty affects 22% of residents, above the national average. SNAP benefit usage at 45% of households reflects economic stress in the area.

The dominant occupation class is management, business, and professional, with retail trade as the leading industry. The average commute of 26 minutes is near the national average.

Educational attainment is near the national average, with 23% of residents holding a bachelor's degree or higher.

Overall, ZIP code 91931 reflects a community defined by economic challenges above the national average, high homeownership, and elevated reliance on food assistance.

749

population

8.21

sq mi land

Standard

ZIP type

Pacific (PT)

timezone

91931 ZIP code map

Cities in ZIP code 91931

Below are the cities the US Postal Service accepts for ZIP code 91931. Using any city not on this list may result in mail delivery delays.

City	Status
Guatay	Acceptable

Demographics updated 05/2026

Population
Total population	749
Population density	91 / sq mi
State FIPS	06
County FIPS	073

Geography
Land area	8.21 sq mi
Water area	0.00 sq mi
Latitude	32.8685
Longitude	-116.5709
Timezone	Pacific (PT)
Area code	619

Total population by age

Gender

Race & ethnicity

Economics updated 05/2026

Household income

Income range	This ZIP	County avg	State avg
Under $50k	27.1%	30.1%	32.6%
$50k – $100k	72.9%	28.5%	27.7%
$100k – $200k	0.0%	28.6%	26.4%
Over $200k	0.0%	12.9%	13.3%

Demographics & statistics

749

Population

People per sq mi

40.2

Median age

$56,518

Median household income

$23,644

Per capita income

Median home value

Median monthly rent

86.2%

Home ownership

22.3%

Poverty rate

7.5%

Unemployment

324

Housing units

22.8%

Bachelor's or higher

Age distribution

Male Female

Under 5

5–9

10–14

35–44

116

55–59

60–64

65–74

75–84

← Male

Female →

Age summary

Group	Count	%
Under 18	241	32.2%
18 and over	508	67.8%
65 and over	203	27.1%
Median age	40.2 years

Race & ethnicity

White 96.3%

Hispanic or Latino 1.8%

Two or more races 1.8%

Group	Count	%
White	735	96.3%
Hispanic or Latino	14	1.8%
Two or more races	14	1.8%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	27.1%	30.1%	32.6%
$50k – $100k	72.9%	28.5%	27.7%
$100k – $200k	0.0%	28.6%	26.4%
Over $200k	0.0%	12.9%	13.3%

Under $10k 4.7%

$10k–$15k 8.8%

$15k–$25k 8.5%

$25k–$35k 13.5%

$35k–$50k 9.1%

$50k–$75k 36.2%

$75k–$100k 13.8%

$100k–$150k 5.3%

Range	% of households
Under $10k	4.7%
$10k–$15k	8.8%
$15k–$25k	8.5%
$25k–$35k	13.5%
$35k–$50k	9.1%
$50k–$75k	36.2%
$75k–$100k	13.8%
$100k–$150k	5.3%
Median income	$56,518

Housing

Home values

Under $50k 42.0%

$50k–$100k 33.9%

$300k–$500k 5.5%

$500k–$1M 18.6%

Housing overview

Metric	Value
Median home value	$0
Median rent / month	$0
Owner occupied	86.2%
Renter occupied	13.8%
Vacant	13.6%
Single-family detached	37.5%
Large apartment buildings	0.0%
Mobile homes	38.9%
Median rooms	4.6
Avg household size (owned)	2.43

Year built

Era	%
2020 or later	0.0%
2010–2019	0.0%
2000–2009	31.3%
1990–1999	7.9%
1980–1989	17.4%
1970–1979	7.6%
1960–1969	11.4%
1950–1959	2.4%
1940–1949	17.4%
1939 or earlier	4.6%

Bedrooms

Size	% of units
No bedroom (studio)	0.0%
1 bedroom	31.3%
2 bedrooms	30.7%
3 bedrooms	22.6%
4 bedrooms	15.5%
5+ bedrooms	0.0%

Vehicles per household

Vehicles	% of households
No vehicle	0.0%
1 vehicle	53.8%
2 vehicles	24.8%
3 or more	21.4%

Heating fuel

Fuel type	%
Utility gas	11.0%
Electricity	13.8%
Propane / LP gas	21.7%
Wood	11.6%

Households & families

Household type	Count	%
Married-couple family	115	36.2%
Cohabiting couple	29	9.1%
Male householder, no spouse	32	10.1%
Female householder, no spouse	142	44.7%
Households with children under 18	63	19.8%
Households with seniors (65+)	172	54.1%
Average household size	2.36

Marital status

Status	Male	Female
Never married	40.3%	0.0%
Married	52.9%	40.4%
Separated	0.0%	9.8%
Widowed	0.0%	10.1%
Divorced	6.8%	39.7%

Education

Less than 9th grade 0.0%

Some HS, no diploma 3.9%

HS graduate 27.4%

Some college, no degree 44.1%

Associate's degree 1.8%

Bachelor's degree 22.8%

Graduate / professional 0.0%

Metric	%
HS diploma or higher	96.1%
Bachelor's or higher	22.8%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	37	15.6%
Kindergarten	0	0.0%
Elementary school	106	44.7%
High school	66	27.8%
College / grad school	28	11.8%

Employment

Industry of employment

Retail trade 26.1%

Professional & management 22.9%

Education & healthcare 18.4%

Construction 15.1%

Manufacturing 11.8%

Arts, food & hospitality 5.7%

Occupation

Category	%
Management, business & arts	25.7%
Service	17.1%
Sales & office	23.3%
Natural resources & construction	15.1%
Production & transportation	18.8%

Employment type

Type	%
Private sector	58.8%
Government	18.4%
Self-employed	22.9%
Unpaid family workers	0.0%

Commute

Method	%
Drive alone	60.8%
Carpool	17.1%
Public transit	0.0%
Walk	0.0%
Work from home	12.9%
Other means	9.2%
Avg commute (minutes)	25.9

Poverty

All people 22.3%

Under 18 years 38.2%

18 and over 14.8%

Married-couple families 0.0%

Female-led households 100.0%

Income support

Source	% of households
Social Security	26.7%
Retirement income	13.8%
Supplemental Security	8.5%
Cash public assistance	8.8%
Food stamps / SNAP	45.3%

Health indicators

Condition	%
Obesity	29.9%
High blood pressure	30.0%
High cholesterol	31.9%
Diabetes	9.0%
Heart disease	5.6%
Stroke	2.6%
Asthma	9.4%
Arthritis	22.8%
Kidney disease	2.6%
Pulmonary disease	6.3%
Cancer	6.4%

Behavior / access	%
Smoking	12.6%
Binge drinking	19.9%
No physical activity	19.0%
Less than 7 hrs sleep	33.3%
Depression	18.9%
Fair or poor health	13.4%
Poor mental health	14.4%
Poor physical health	10.3%
No health insurance	9.9%
Visited doctor (checkup)	69.8%
Visited dentist	69.4%
Cholesterol screening	92.3%
Teeth loss	9.7%

Veterans & disability

Veterans	Count	%
Civilian veterans	0	0.0%

Disability	%
Any disability	8.5%
Under 18	0.0%
18–64 years	2.6%
65 and over	27.6%

Health insurance coverage

Type	%
Private insurance	57.9%
Public insurance	47.4%
No insurance	2.7%
Uninsured under 19	0.0%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	717	95.7%
Spanish	0	0.0%
Other Indo-European	0	0.0%
Asian & Pacific Islander	0	0.0%
Other languages	0	0.0%

Place of birth & citizenship

Origin	Count	%
Native born (US)	749	100.0%
Born in same state	749	100.0%
Born in different state	472	63.0%
Foreign born	0	0.0%
Naturalized citizen	0	0.0%
Not a US citizen	0	0.0%

Ancestry

Ancestry	Count	%
French	101	13.5%
English	87	11.6%
Italian	74	9.9%

Ancestry	Count	%
Arab	28	3.7%
Polish	9	1.2%

Technology access

Metric	% of households
Computer access	42.5%
Internet access	90.9%

Source: U.S. Census Bureau, American Community Survey 2025 estimates.

Frequently asked questions about ZIP code 91931

What city is ZIP code 91931 in?

ZIP code 91931 is primarily assigned to Guatay, California.

What county is ZIP code 91931 in?

ZIP code 91931 falls within San Diego County, California.

Does ZIP code 91931 have an older population?

27% of residents in ZIP code 91931 are 65 or older, above the national average of ~17%.

What is the poverty rate in ZIP code 91931?

22% of residents in ZIP code 91931 live below the poverty line, above the national average.

Is ZIP code 91931 mostly owner-occupied?

86% of occupied units in ZIP code 91931 are owner-occupied, well above the national average.

What is the population of ZIP code 91931?

ZIP code 91931 has an estimated population of 749 residents, with a density of 91 people per square mile.

What timezone is ZIP code 91931 in?

ZIP code 91931 observes the PST timezone.