ZIP code 91931
Where is ZIP code 91931?
Guatay, California
San Diego County · PO Box only ZIP code
ZIP code 91931 belongs to Guatay, California in San Diego County. 91931 is a PO Box only ZIP code: it is used for post office boxes at the Guatay post office, not for street addresses. It is in the Pacific Time zone and uses area codes 619 and 858. About 494 people live in the 91931 area, where the median household income is $63,750. The closest ZIP codes are 91962 (Pine Valley, 2.8 mi east), 91916 (Descanso, 3 mi northwest) and 91948 (Mount Laguna, 8.1 mi east).
| ZIP code | 91931 |
|---|---|
| Type | PO Box only (no street delivery) |
| Status | Active |
| City | Guatay |
| State | California (CA) |
| County | San Diego County |
| Time zone | Pacific Time · now |
| Area codes | 619, 858 |
| Coordinates | 32.8497, -116.5583 map |
| 3-digit prefix | 919 |
Population and income in 91931
| Population | 494 · lower than 87% of California ZIP codes |
|---|---|
| People per square mile | 60 · lower than 73% of California ZIP codes |
| Median age | 65.2 years · higher than 97% of California ZIP codes |
| Men / women | 44% / 57% |
| Median household income | $63,750 · lower than 82% of California ZIP codes |
| Income per person | $34,239 |
| Below the poverty line | 3.6% |
| Bachelor’s degree or higher | 23% of adults 25+ |
| Housing units | 270 |
| Households | 242 (2.04 people on average) |
| Owners / renters | 81% / 19% |
| Land area | 8.21 sq mi |
Source: U.S. Census Bureau, American Community Survey 5-year estimates (2020–2024) for ZIP Code Tabulation Area 91931. Census ZIP areas are close to, but not exactly the same as, USPS delivery areas.
ZIP codes near 91931
| ZIP code | City | Distance | Type |
|---|---|---|---|
| 91962 | Pine Valley, CA | 2.8 mi E | Standard |
| 91916 | Descanso, CA | 3 mi NW | Standard |
| 91948 | Mount Laguna, CA | 8.1 mi E | PO Box only |
| 91901 | Alpine, CA | 11.5 mi W | Standard |
| 91903 | Alpine, CA | 12.1 mi W | PO Box only |
| 91906 | Campo, CA | 13.7 mi S | Standard |
| 92036 | Julian, CA | 14.1 mi N | Standard |
| 91963 | Potrero, CA | 16.1 mi S | Standard |
| 91980 | Tecate, CA | 18.4 mi S | Standard |
| 91935 | Jamul, CA | 18.4 mi SW | Standard |
| 91905 | Boulevard, CA | 18.5 mi SE | Standard |
| 91917 | Dulzura, CA | 19 mi SW | Standard |
Straight-line distance between ZIP code center points. Find every ZIP code within 10 miles of 91931 or measure the distance to another ZIP code.
How to address mail to 91931
PO BOX 123
GUATAY CA 91931
Put the city, the two-letter state code and the ZIP code on the last line. Adding the 4-digit ZIP+4 code (91931-XXXX) helps mail sort faster but isn’t required.
Questions
- What city is ZIP code 91931?
- 91931 is a Guatay, California ZIP code.
- What county is 91931 in?
- ZIP code 91931 is in San Diego County, California.
- What time zone is ZIP code 91931 in?
- 91931 is in the Pacific Time zone (America/Los_Angeles).
- What area code is 91931?
- Phone numbers in ZIP code 91931 use area codes 619 and 858.
- What is the population of ZIP code 91931?
- About 494 people live in ZIP code 91931, according to the Census Bureau’s American Community Survey (2020–2024).
- What is the median income in 91931?
- The median household income in 91931 is $63,750 a year, lower than 82% of California ZIP codes.
- Can I use 91931 for a street address?
- No. 91931 is only for PO Boxes. Street addresses in Guatay use another ZIP code.
- What ZIP codes are near 91931?
- The nearest ZIP codes to 91931 are 91962 (Pine Valley, 2.8 miles), 91916 (Descanso, 3 miles), 91948 (Mount Laguna, 8.1 miles) and 91901 (Alpine, 11.5 miles).