Casa de Oro-Mount Helix is a community in San Diego County, California, home to about 19,765 people across 6.8 square miles. It has no ZIP code of its own: it’s part of 91941, 91977 and 92020.
Homes sold for a median of $525 per square foot across 3 ZIP codes in the three months ending August 2026, and all of them were seller’s markets.
Mostly La Mesa; part is in Casa de Oro-Mount Helix
Mostly La Presa; part is in Casa de Oro-Mount Helix
Mostly El Cajon; part is in Casa de Oro-Mount Helix
Each card is that ZIP code’s whole market, including any part outside Casa de Oro-Mount Helix. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up Casa de Oro-Mount Helix’s story and what everyday life there is like, for people thinking about moving in.
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| Nearest major airport | San Diego International Airport (SAN)11 miles away |
|---|---|
| Nearest city of 250,000+ | San Diego, CA9 miles away |
Straight-line distances from the center of Casa de Oro-Mount Helix; driving is longer.
Source: Airports from OurAirports (scheduled passenger service); city centers and populations from the U.S. Census Bureau.
Source: Members of Congress from the congress-legislators project; districts from the Census Bureau’s relationship files; governor and mayor from Wikidata.
Casa de Oro-Mount Helix had 19,576 residents in the 2020 census, up 4% since 2000.
It’s the 349th largest of 1,563 towns in California by population.
San Diego County grew from 35,090 residents in 1900 to 3,298,634 in 2020.
San Diego County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 89°F in summer, and winter lows average 42°F. About 11.6 inches of rain and melted snow fall in a typical year.
Source: NOAA 1991–2020 climate normals, El Cajon, CA weather station (5 miles away).
1,391,721 jobs at 93,407 businesses in San Diego County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
1,674 doctors and other health care providers list an office in Casa de Oro-Mount Helix’s ZIP codes.
Nearest hospitals
Providers with an office here
| Primary care doctors | 116 |
|---|---|
| Specialist doctors | 61 |
| Dentists | 128 |
| Nurse practitioners and physician assistants | 121 |
| Mental health providers | 1,099 |
| Physical and occupational therapists | 93 |
| Optometrists | 20 |
| Chiropractors | 36 |
| Pharmacies | 38 |
Source: Hospitals from CMS Hospital General Information (ratings are CMS overall star ratings); straight-line distances; providers from the CMS National Plan and Provider Enumeration System (NPPES), by practice address and primary specialty.
Parks (16 nearby)
Grocery stores (10 nearby)
Pharmacies (2 nearby)
Libraries (4 nearby)
Museums
Theaters and performance venues (3 nearby)
Counts are within about 2 miles of the center of town.
Source: Map data © OpenStreetMap contributors (openstreetmap.org/copyright), as mapped by volunteers; it can miss places or include closed ones.
Public schools here are run by Cajon Valley Union, La Mesa-Spring Valley, EJE Elementary Academy Charter District and others. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| Anza ElementaryEl Cajon | K–6 | 687 | Public | 3.2 mi |
| Avocado ElementaryLa Mesa | K–5 | 573 | Public | 2.3 mi |
| Avondale ElementarySpring Valley | K–5 | 291 | Public | 3.3 mi |
| Bancroft ElementarySpring Valley | K–8 | 391 | Public | 2.4 mi |
| Casa de Oro ElementarySpring Valley | K–5 | 320 | Public | 1.8 mi |
| Chase Avenue ElementaryEl Cajon | K–6 | 757 | Public | 2.4 mi |
| EJE Elementary Academy CharterEl Cajon | K–5 | 582 | Charter | 2.2 mi |
| EmpowerEl Cajon | K–8 | 21 | Special Education | 3.4 mi |
| Fletcher Hills ElementaryEl Cajon | K–5 | 540 | Public | 2.7 mi |
| Flying Hills School of ArtsEl Cajon | K–8 | 742 | Public | 3.6 mi |
| Fuerte ElementaryEl Cajon | K–5 | 686 | Public | 3.0 mi |
| Highlands ElementarySpring Valley | K–5 | 357 | Public | 2.0 mi |
| Johnson ElementaryEl Cajon | K–5 | 766 | Public | 3.1 mi |
| Kempton Street Literacy AcademySpring Valley | K–5 | 480 | Public | 3.6 mi |
| La Mesa Dale ElementaryLa Mesa | K–5 | 460 | Public | 2.1 mi |
| La Presa ElementarySpring Valley | K–5 | 346 | Public | 3.9 mi |
| Lemon Avenue ElementaryLa Mesa | K–5 | 502 | Public | 0.7 mi |
| Literacy First CharterEl Cajon | K–12 | 2,160 | Charter | 3.1 mi |
| Maryland Avenue ElementaryLa Mesa | K–5 | 451 | Public | 2.6 mi |
| Murdock ElementaryLa Mesa | K–5 | 608 | Public | 0.7 mi |
| Pepper Drive ElementaryEl Cajon | K–8 | 661 | Public | 5.2 mi |
| Rancho ElementarySpring Valley | K–5 | 324 | Public | 4.2 mi |
| Rolando ElementaryLa Mesa | K–5 | 371 | Public | 3.0 mi |
| Sweetwater Springs ElementarySpring Valley | K–5 | 378 | Public | 2.6 mi |
| The Learning Choice Academy - East CountyLa Mesa | K–12 | 466 | Charter | 1.1 mi |
| Vista La Mesa AcademyLa Mesa | K–8 | 518 | Public | 3.0 mi |
| College Preparatory MiddleSpring Valley | 5–8 | 397 | Charter | 1.9 mi |
| Sci Tech Engr Arts and Math Acad at La PresaSpring Valley | 5–8 | 800 | Public | 3.5 mi |
| Cajon Valley MiddleEl Cajon | 6–8 | 942 | Public | 3.5 mi |
| EJE Middle AcademyEl Cajon | 6–8 | 254 | Charter | 2.2 mi |
And 9 more.
| School | Grades | Students | Affiliation | Distance |
|---|---|---|---|---|
| Heartland ChristianSpring Valley | Pre-K–12 | 155 | Christian (no specific denomination) | 1.6 mi |
| Trinity Christian SchoolSpring Valley | Pre-K–8 | 188 | Presbyterian | 1.0 mi |
| Santa Sophia AcademySpring Valley | TK–8 | 218 | Roman Catholic | 1.1 mi |
| Our Lady of Grace Elementary SchoolEl Cajon | K–8 | 305 | Roman Catholic | 2.9 mi |
| Fred Finch Youth Center Nonpublic SchoolSpring Valley | 8–12 | 16 | Nonsectarian | 1.0 mi |
| Foothills Christian High SchoolEl Cajon | 9–12 | 262 | Christian (no specific denomination) | 2.5 mi |
Source: U.S. Department of Education, NCES: Common Core of Data (2024-2025) for public schools; Private School Universe Survey (2023-2024) for private schools. Listed by address; we don’t rate schools.
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Shares ZIP codes with El Cajon, La Presa, La Mesa, Spring Valley (San Diego County) and Rancho San Diego.
Town boundaries don’t always match ZIP codes: a ZIP code can cross into neighboring towns, and a town can share a ZIP code with its neighbors. Facts describe the town itself; market figures describe whole ZIP codes.