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Bostonia, California.

A community in San Diego County, with no city government of its own. Zillow publishes no home prices for it: see San Diego County’s.

Living in Bostonia, San Diego County, California

Bostonia, in San Diego County, had 16,882 people in the 2020 census. Half its households earn more than $78,878 a year and half less, against $106,268 across San Diego County; 14% of its people live below the poverty line. 42% of its homes are lived in by their owners and 58% are rented. Unemployment in San Diego County was 4.9% in August 2026, and the county had 0.1% fewer jobs in 2025 than the year before. The most residents work in schools and health care, then restaurants and hotels.

People 16,882 in the 2020 census; median age 34.2
Household income $78,878 the median, give or take $14,324 · San Diego County: $106,268
Unemployment 4.9% San Diego County, August 2026; 5.1% a year before
Homes 42% lived in by their owners; 58% rented
  • 5,783households
  • 22%of adults have a degree
  • 14%below the poverty line
  • 25 mintypical commute
  • 13%work from home

What residents work in

  • Schools, hospitals and social care17%
  • Restaurants, hotels and entertainment15%
  • Shops (retail)15%
  • Professional and business services12%
  • Building trades8%
  • Manufacturing8%

Employed residents by industry, from the Census survey. San Diego County had 1,535,067 jobs in 2025, 0.1% fewer than the year before (Bureau of Labor Statistics).

Weather through the year

Average daily high and low for each month: coldest in December, 68° and 42°; warmest in August, 89° and 65° 40° 50° 60° 70° 80° 90° J F M A M J J A 89° 65° S O N D 68° 42°
Average daily high and low for each month: coldest in December, 68° and 42°; warmest in August, 89° and 65° 40° 50° 60° 70° 80° 90° J F M A M J J A 89° 65° S O N D 68° 42°

Coldest in December, with highs near 68° and lows near 42°; warmest in August, with highs near 89° and lows near 65°. About 12 inches of rain a year, and little or no snow.

Average daily high and low, 1991–2020, at the El Cajon weather station, 2 miles away (NOAA).

Largest workplaces in Bostonia

  1. Cacy ElectricElectrical, electrical wiring, and low voltage electrical work116
  2. DA Whitacre ConstructionFraming contractors90
  3. R D Engineering & ConstructionRadio transmitting tower construction38
  4. Commercial Scaffolding of California, Inc.--SD divScaffold erecting and dismantling35
  5. Modern MasonryMasonry contractors31

Staff on average in 2025, as each workplace reported it to OSHA with its injury records: 5 workplaces with 20 or more staff, 310 people in all. Not listed: many offices and banks, which need not report to OSHA; military bases, whose staff OPM withholds; and, in about half the states, city and county governments.

Natural hazards

  1. Inland floodingRelatively high
  2. Earthquakesrelatively high in parts of BostoniaRelatively moderate
  3. Heat wavesRelatively moderate

FEMA’s National Risk Index (December 2025) rates the risk each natural hazard poses to the people, buildings and farms in Bostonia’s census tracts, against the rest of the country; all of them together, relatively moderate. It is meant for planning, not a substitute for a local risk assessment or a flood map: FEMA’s index.

From the U.S. Census Bureau’s 2020 census and its American Community Survey (2020–2024 five-year estimates), and the Bureau of Labor Statistics. A survey, so each figure has a margin of error, and figures it is not sure of are left out. More on San Diego County.