90403 ZIP Code, Santa Monica, CA

90403 is a ZIP code in Santa Monica, California in Los Angeles County. It covers 1.4 square miles of land. The closest ZIP codes are 90402, 90401 and 90404. 23,867 people live here in 13,165 households. It is densely built, at about 16,903 people per square mile, and most households rent (26% own). Median household income is $121,925, above the California median of $99,122.

Quick facts

Key figures

MeasureValue
Residents23,867
Households13,165
Median household income$121,925
Income per person$96,523
Median age44.2
Homeowners26.2%
Median home value$1,548,900
Median rent$2,463
Bachelor's degree or higher75.7%
Average commute (minutes)26.7
Households with kids under 1813.0%
Moved in the past year16.3%
Below the poverty line11.3%
Broadband internet93.5%
Speak a non-English language at home27.3%

Household income

% of householdsValue
<$10K8.0%
$10–15K2.8%
$15–25K4.0%
$25–35K4.4%
$35–50K5.7%
$50–75K8.0%
$75–100K10.0%
$100–150K15.5%
$150–200K11.1%
$200K+30.7%

Age

% of all residentsValue
<106.8%
10–196.8%
20–243.6%
25–3417.4%
35–4417.2%
45–5412.7%
55–6415.1%
65–7410.0%
75+10.3%

Tenure

% of housing unitsValue
Owned, with mortgage13.8%
Owned outright9.2%
Rented64.9%
Vacant12.1%

Type of building

% of housing unitsValue
Detached house9.2%
Townhome3.1%
2–4 units9.5%
5–19 units53.2%
20+ units24.9%
Mobile / other0.2%

Businesses in 90403

1,583 business establishments with 10,765 employees (ZIP Codes Business Patterns 2023).

EDDM carrier routes

90403 has 24 USPS carrier routes with 14,876 residential and 897 business mailboxes. Open the EDDM route map.

Carrier routes in 90403

90403 has 24 USPS carrier routes (24 city (C)) with 14,876 residential and 897 business mailboxes. Routes range from 249 homes (C029) to 965 homes (C019); the median route has 631 homes. The Census counted 13,165 households in 90403 (2020–2024 average); USPS counts current mailboxes, including new and vacant homes.

Homes per routeRoutes
1–2491
250–4996
500–7499
750–9998
1,000–1,4990
1,500+0

Best routes in 90403 for…

Most businesses

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

  1. Route C029 — USPS business mailboxes 185, 249 homes
  2. Route C018 — USPS business mailboxes 137, 282 homes
  3. Route C008 — USPS business mailboxes 110, 482 homes
  4. Route C027 — USPS business mailboxes 67, 283 homes
  5. Route C039 — USPS business mailboxes 58, 518 homes

Select these 5 routes on the route map

Every carrier route in 90403

RouteTypeHomesBusinessesEst. median incomeEst. ownersEst. families with kidsEst. moved in past year
C002City8376$115,190———
C003City7743$115,190———
C004City82827$169,435———
C005City92446$169,435———
C008City482110$169,435———
C009City5041$161,247———
C010City50157$169,435———
C012City6878$17,938———
C016City7402$115,190———
C018City282137$158,247———
C019City9654$160,891———
C020City49820$158,247———
C022City58817$158,247———
C023City4061$161,247———
C024City6733$169,435———
C027City28367$97,318———
C028City32520$97,318———
C029City249185$158,247———
C030City75140$178,695———
C031City8224$162,227———
C035City71037$161,247———
C037City94419$160,891———
C038City58525$161,247———
C039City51858$158,247———

Income, owners, families and movers are estimates for each route (how we estimate them); mailbox counts are current USPS figures. Open 90403 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 90403

Where it ranks

Mail every home in 90403

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) 90403, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.

Frequently asked questions

What city is 90403 in?
90403 is a Santa Monica, CA mailing address. By land area, 100% lies inside Santa Monica.
What county is 90403 in?
90403 is in Los Angeles County.
What is the population of 90403?
About 23,867 people (±1,024), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 25,278.
What is the median household income in 90403?
$121,925 (±$15,573), 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 90403?
24 USPS carrier routes with 14,876 residential and 897 business mailboxes (15,773 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.
What ZIP codes are near 90403?
The closest, measured center to center: 90402 (0.7 mi, Santa Monica), 90401 (1 mi, Santa Monica), 90404 (1.1 mi, Santa Monica), 90405 (1.8 mi, Santa Monica), 90073 (2.6 mi) and 90025 (2.8 mi, Los Angeles).

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