92021 ZIP Code, El Cajon, CA

92021 is a ZIP code in El Cajon, California in San Diego County. It covers 28 square miles of land. The closest ZIP codes are 92019, 92040 and 92020. 70,501 people live here in 22,953 households, more than in 9 of every 10 California ZIP codes. At about 2,514 people per square mile it has suburban density, and owners and renters are mixed (54% own). Median household income is $74,013, below the California median of $99,122.

Quick facts

Key figures

MeasureValue
Residents70,501
Households22,953
Median household income$74,013
Income per person$35,192
Median age36.3
Homeowners53.8%
Median home value$611,900
Median rent$1,893
Bachelor's degree or higher22.4%
Average commute (minutes)25.8
Households with kids under 1837.7%
Moved in the past year15.6%
Below the poverty line18.5%
Broadband internet93.2%
Speak a non-English language at home37.1%

Household income

% of householdsValue
<$10K4.6%
$10–15K3.0%
$15–25K8.6%
$25–35K6.4%
$35–50K12.6%
$50–75K15.1%
$75–100K10.7%
$100–150K18.0%
$150–200K8.7%
$200K+12.2%

Age

% of all residentsValue
<1014.2%
10–1914.0%
20–245.5%
25–3414.0%
35–4414.5%
45–5410.1%
55–6412.2%
65–749.9%
75+5.6%

Tenure

% of housing unitsValue
Owned, with mortgage32.9%
Owned outright19.3%
Rented44.6%
Vacant3.3%

Type of building

% of housing unitsValue
Detached house43.7%
Townhome6.3%
2–4 units3.8%
5–19 units9.6%
20+ units20.8%
Mobile / other15.7%

Businesses in 92021

1,315 business establishments with 12,986 employees (ZIP Codes Business Patterns 2023).

EDDM carrier routes

92021 has 35 USPS carrier routes with 24,083 residential and 1,242 business mailboxes. Open the EDDM route map.

Carrier routes in 92021

92021 has 35 USPS carrier routes (34 city (C), 1 rural (R)) with 24,083 residential and 1,242 business mailboxes. Routes range from 361 homes (C053) to 1,321 homes (C043); the median route has 659 homes. The Census counted 22,953 households in 92021 (2020–2024 average); USPS counts current mailboxes, including new and vacant homes.

Homes per routeRoutes
1–2490
250–4998
500–74916
750–9996
1,000–1,4995
1,500+0

Best routes in 92021 for…

Most businesses

For B2B offers: office supplies, cleaning, IT, catering and commercial services.

  1. Route C026 — USPS business mailboxes 219, 668 homes
  2. Route C001 — USPS business mailboxes 178, 458 homes
  3. Route C021 — USPS business mailboxes 173, 601 homes
  4. Route C020 — USPS business mailboxes 108, 685 homes
  5. Route C045 — USPS business mailboxes 97, 420 homes

Select these 5 routes on the route map

Every carrier route in 92021

RouteTypeHomesBusinessesEst. median incomeEst. ownersEst. families with kidsEst. moved in past year
C001City458178$97,238———
C003City4902$103,067———
C004City51511$154,994———
C005City62711$115,827———
C006City70758$139,643———
C008City57814$86,679———
C009City5662$114,398———
C010City1,1224$56,818———
C011City4700$108,931———
C012City6066$88,396———
C016City74451$44,481———
C018City6593$78,507———
C020City685108$59,713———
C021City601173$58,353———
C024City7732$97,355———
C025City1,04630$51,606———
C026City668219$50,062———
C029City6781$42,893———
C032City5201$91,746———
C033City83424$103,067———
C034City8015$44,358———
C036City9928$40,258———
C038City3829$124,918———
C040City8813$105,215———
C041City6529$59,713———
C043City1,32119$88,396———
C044City1,01223$67,580———
C045City42097$103,067———
C048City1,02016$44,861———
C049City80743$66,044———
C050City61538$124,918———
C051City68656$101,569———
C052City3901$135,859———
C053City3613$129,729———
R003Rural39614$129,729———

Income, owners, families and movers are estimates for each route (how we estimate them); mailbox counts are current USPS figures. Open 92021 on the EDDM route map.

How route demographics are estimated

Mailbox counts come from USPS; demographics are estimates

The number of homes and businesses on each carrier route is the current USPS EDDM count. The Census Bureau does not publish figures for carrier routes, so income, homeownership, ages, families, movers and housing age on a route are EDDM2GO estimates built from Census block groups (neighborhood areas of roughly 600 to 3,000 people).

How a route gets its figures: the block-group length-share method

We trace each route's streets every 25 meters and record which block group each stretch falls in. The route's homes are spread along its streets in proportion to length, so a route with 60% of its street length in one block group is assumed to have 60% of its homes there. Each block group then contributes its Census counts in proportion to the share of its housing units that sit on the route (capped at the whole block group). Medians are recalculated from the combined income, home-value and age brackets, the way the Census Bureau computes them, not averaged.

Margins of error

Census survey figures carry a margin of error at 90% confidence; we carry it through the calculation and show it as ±. Our margins treat the route-to-block-group split as exact, so the real uncertainty is larger. Routes with fewer than 100 estimated households, large margins, or streets we could not place are flagged.

Different years

USPS mailbox counts are current. Census figures are 5-year averages for 2020–2024, so a new subdivision may have more homes on the route today than the Census counted. Use the route figures to compare routes with each other, not as an exact head count.

Why some routes show identical figures

Two routes that run through the same block group get the same percentages and medians, because the Census publishes one set of figures for the whole block group. Their mailbox counts still differ, and those are exact.

Route and mailbox counts: USPS EDDM route data. Route demographics: EDDM2GO estimates from U.S. Census Bureau American Community Survey 5-year block-group data (2020–2024) and 2024 cartographic block-group boundaries. This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.

Nearby ZIP codes

Areas that include 92021

Where it ranks

Mail every home in 92021

Route counts on this page price as Full Service 6.5 × 9 postcards: we print, bundle by carrier route and hand the mailing to USPS. Prefer to take it to the Post Office yourself? Print only costs less and you pay postage at drop-off.

EDDM guides

ZIP code statistics describe the Census ZIP Code Tabulation Area (ZCTA) 92021, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.

Frequently asked questions

What city is 92021 in?
92021 is a El Cajon, CA mailing address. By land area, 18% lies inside Harbison Canyon, 13% lies inside Crest, 11% lies inside El Cajon and 6% lies inside Bostonia; the rest is outside any Census-defined city or community.
What county is 92021 in?
92021 is in San Diego County.
What is the population of 92021?
About 70,501 people (±2,881), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 70,584.
What is the median household income in 92021?
$74,013 (±$6,137), compared with $99,122 for California as a whole. Half the households in the ZIP code earn more and half earn less.
How many carrier routes and mailboxes are in 92021?
35 USPS carrier routes with 24,083 residential and 1,242 business mailboxes (25,317 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.
What ZIP codes are near 92021?
The closest, measured center to center: 92019 (3.9 mi, Rancho San Diego), 92040 (5.2 mi, Lakeside), 92020 (6.2 mi, El Cajon), 92071 (7.1 mi, Santee), 91901 (8.7 mi, Alpine) and 91941 (8.9 mi, Casa de Oro-Mount Helix).

This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.