Zip Code 91942
La Mesa, California — San Diego County
📍 ZIP code 91942 is in La Mesa, San Diego County, California.
ZIP code 91942 is located in La Mesa, San Diego County, California. It is a zip code in the Pacific (PST/PDT) Time Zone with an estimated population of 40,920. The area code for ZIP code 91942 is 805.
Quick Answer
Zip code 91942 is in La Mesa, California (San Diego County). It has a population of 40,920, median household income of $81,262, and median home value of $689,300.
Population
40,920
Income
$81,262
Home Value
$689,300
Climate
86°F / 43°F
About Zip Code 91942
Zip code 91942 is located in La Mesa, California, within San Diego County. Home to approximately 40,920 residents, this area sits at an elevation of 566 ft and falls within the Pacific (PST/PDT) timezone. The local area code is 805.
The median household income is $81,262 per year, which is above the national median of $70,784. Homes in this zip code have a median value of $689,300, and the cost of living index is 182 (82% above the national average of 100).
Summers average a high of 86°F while winters drop to 43°F. The area receives about 12 in of rain annually. The zip code covers 5.9 square miles of land area.
Key Statistics
40,920
$81,262
$689,300
Pacific (PST/PDT)
805
566 ft
5.9 sq mi
37.5
18,488
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Compare With Nearby Zip Codes
| Metric | 91942 | 91941 | 92119 | 92120 | 92115 | 91945 |
|---|---|---|---|---|---|---|
| City | La Mesa, CA | Spring Valley, CA | San Diego, CA | San Diego, CA | San Diego, CA | Lemon Grove, CA |
| Population | 40,920 | 33,706 | 24,868 | 31,797 | 64,011 | 27,531 |
| Median Income | $81,262 | $111,607 | $115,600 | $114,579 | $75,178 | $79,381 |
| Home Value | $689,300 | $884,800 | $833,100 | $870,200 | $722,500 | $640,500 |
| Cost of Living | 182 | 238 | 216 | 233 | 180 | 169 |
| Median Age | 37.5 | 41.2 | 41.7 | 37.1 | 29 | 38.8 |
Cost of Living
100 = National Average. La Mesa's cost of living is 82% above the national average.
vs. State Avg
Above
Affordability
Expensive
Income-to-Home
8.5x
Demographics
Zip code 91942 has a population of 40,920 people with a median age of 37.5. There are 18,488 housing units in this area.
Racial & Ethnic Composition
Source: U.S. Census Bureau American Community Survey estimates.
Population History
La Mesa (91942) population trend from 2010 to 2024
↓ -19.6%Source: U.S. Census Bureau estimates and American Community Survey data.
Climate & Weather
86°F
43°F
12 in
0 in
La Mesa experiences warm summers with average highs around 86°F. Winters are mild with lows averaging 43°F. The area receives virtually no snowfall.
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Housing & Economy
Median Home Value
$689,300
Median Household Income
$81,262
With 18,488 housing units across 5.9 square miles, 91942 has a housing density of 3,134 units per square mile. The home price-to-income ratio is 8.5x.
Location & Geography
Latitude
32.7780°
Longitude
-117.0215°
Land Area
5.9 sq mi
Water Area
0 sq mi
Nearby Zip Codes
Zip codes closest to 91942 (La Mesa, CA) with distances:
ZIP Codes with Similar Income Nationwide
The five U.S. ZIP codes whose median household income is closest to 91942's $81,262. A way to compare La Mesa to economically similar communities elsewhere in the country.
Computed from U.S. Census Bureau ACS 5-Year Estimates by the Zip Code Near Me Data Team.
ZIP Codes with Similar Demographics
The five U.S. ZIP codes whose racial and ethnic composition most closely matches 91942 (La Mesa, CA). Similarity is measured by cosine distance on the five-category ACS demographic vector.
Computed from U.S. Census Bureau ACS 5-Year Estimates by the Zip Code Near Me Data Team.
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People Also Ask
What zip code is La Mesa, California?
La Mesa, California uses zip code 91942.
What county is zip code 91942 in?
Zip code 91942 is located in San Diego County, California.
What is the population of zip code 91942?
The population of zip code 91942 is 40,920 with a median age of 37.5.
Is 91942 in La Mesa, California?
Yes, zip code 91942 is in La Mesa, San Diego County, California. The area code is 805.
Frequently Asked Questions
What city is zip code 91942 in?
Zip code 91942 is in La Mesa, California. It is part of San Diego County and uses the Pacific (PST/PDT) timezone.
What is zip code 91942?
Zip code 91942 is a U.S. postal code in La Mesa, California (San Diego County). It has a population of 40,920 and covers 5.9 square miles.
What is the population of zip code 91942?
The population of zip code 91942 (La Mesa, CA) is 40,920 with a median age of 37.5. There are approximately 18,488 housing units in this area.
What is the median income in zip code 91942?
The median household income in zip code 91942 (La Mesa, CA) is $81,262 per year. The cost of living index is 182 (100 = national average).
What is the average home price in zip code 91942?
The median home value in zip code 91942 (La Mesa, CA) is $689,300. The cost of living index is 182 compared to the national average of 100.
What county is zip code 91942 in?
Zip code 91942 is located in San Diego County, California. The primary city is La Mesa.
What is the area code for zip code 91942?
Zip code 91942 in La Mesa, CA uses area code 805. It is located in the Pacific (PST/PDT) timezone.
Is zip code 91942 a good place to live?
Zip code 91942 (La Mesa, CA) has a cost of living index of 182 (100 = national average), a median household income of $81,262, and median home values of $689,300. The median age is 37.5. Visit the full page for demographics, climate, and nearby zip code comparisons.
What is the cost of living in zip code 91942?
The cost of living index for zip code 91942 (La Mesa, CA) is 182, where 100 represents the national average. This area is above the national average. Median home value: $689,300.
What schools serve zip code 91942?
Zip code 91942 in La Mesa, California is served by the local school district of San Diego County. For specific school information, check your state's department of education or GreatSchools.org.
All demographic data on this page is sourced from the U.S. Census Bureau American Community Survey (ACS) 5-Year Estimates. ZIP code boundary and delivery data is sourced from the United States Postal Service (USPS). Data is updated periodically and may not reflect the most current figures. Census Bureau ZIP Code Tabulation Areas (ZCTAs) may differ slightly from USPS ZIP code boundaries.
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Data Sources
- Population, income, housing, age, and demographics
- U.S. Census Bureau, American Community Survey 5-Year Estimates, 2019-2023 vintage.
- ZIP to city and county mapping
- USPS and HUD-USPS ZIP-County Crosswalk.
- Time zones and area codes
- IANA tz database and NANPA.
- Elevation
- U.S. Geological Survey National Elevation Dataset (NED), via the USGS Elevation Point Query Service. Mapped to each ZCTA centroid coordinates. Last refreshed 2026-05-19.
- Last refreshed
- 2026-05-18.