Bostonia is a community in San Diego County, California, home to about 16,765 people across 1.9 square miles. It has no ZIP code of its own: it’s part of 92021.
Homes sold for a median of $483 per square foot in the three months ending August 2026, a seller’s market.
Mostly El Cajon; part is in Bostonia
Each card is that ZIP code’s whole market, including any part outside Bostonia. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up Bostonia’s story and what everyday life there is like, for people thinking about moving in.
Are you a local agent who knows Bostonia well? Agents who advertise here will be able to write the guide. Advertise on OfferBacked
| Nearest major airport | San Diego International Airport (SAN)17 miles away |
|---|---|
| Nearest city of 250,000+ | San Diego, CA12 miles away |
Straight-line distances from the center of Bostonia; 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.
Bostonia had 16,882 residents in the 2020 census, up 11% since 2000.
It’s the 389th 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 (about a mile 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).
433 doctors and other health care providers list an office in Bostonia.
Nearest hospitals
Providers with an office here
| Primary care doctors | 21 |
|---|---|
| Specialist doctors | 8 |
| Dentists | 36 |
| Nurse practitioners and physician assistants | 48 |
| Mental health providers | 257 |
| Physical and occupational therapists | 44 |
| Optometrists | 4 |
| Chiropractors | 15 |
| Pharmacies | 20 |
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 (2 nearby)
Grocery stores (1 nearby)
Pharmacies (1 nearby)
Libraries
Museums
Theaters and performance venues
Counts are within about 1 mile 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, Bostonia Global District, Diego Valley East Public Charter District and others. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| Blossom Valley ElementaryEl Cajon | K–5 | 533 | Public | 5.4 mi |
| Bostonia GlobalEl Cajon | K–12 | 1,266 | Charter | 0.8 mi |
| Crest ElementaryEl Cajon | K–8 | 271 | Public | 3.4 mi |
| Diego Valley East Public CharterEl Cajon | K–12 | 408 | Charter | 1.4 mi |
| Kidinnu AcademyEl Cajon | K–8 | 433 | Charter | 0.9 mi |
| Magnolia ElementaryEl Cajon | K–5 | 703 | Public | 1.9 mi |
| Naranca ElementaryEl Cajon | K–6 | 985 | Public | 1.7 mi |
| Rios ElementaryEl Cajon | K–5 | 255 | Public | 3.3 mi |
| W. D. Hall ElementaryEl Cajon | K–5 | 579 | Public | 0.5 mi |
| Greenfield MiddleEl Cajon | 6–8 | 730 | Public | 0.6 mi |
| Los Coches Creek MiddleEl Cajon | 6–8 | 518 | Public | 6.7 mi |
| El Cajon Valley HighEl Cajon | 9–12 | 1,701 | Public | 2.0 mi |
| School | Grades | Students | Affiliation | Distance |
|---|---|---|---|---|
| Dayspring Christian Learning CenterEl Cajon | Pre-K–K | 10 | Pentecostal | 1.2 mi |
| Pepper Valley Learning CenterEl Cajon | Pre-K–K | 34 | Nonsectarian | 0.6 mi |
| St Kieran Catholic SchoolEl Cajon | Pre-K–8 | 127 | Roman Catholic | 0.4 mi |
| Taproot Montessori Preschool & KindergartenEl Cajon | Pre-K–K | 1 | Nonsectarian | 0.9 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.
Buying or selling around Bostonia? Tell us what you need and when. No agents advertise here yet, so we’ll keep your request for up to 30 days and send it to local agents who join. No obligation, and you choose who to work with.
Loading map…
Shares ZIP codes with El Cajon, Winter Gardens, Lakeside (San Diego County), Harbison Canyon, Crest and Granite Hills.
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.