What city is 90603 in?

90603 is a Whittier, CA mailing address. By land area, 100% lies inside Whittier.

What county is 90603 in?

90603 is in Los Angeles County.

What is the population of 90603?

About 21,118 people (±1,445), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 21,174.

What is the median household income in 90603?

$136,705 (±$11,808), 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 90603?

15 USPS carrier routes with 7,069 residential and 456 business mailboxes (7,548 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.

What ZIP codes are near 90603?

The closest, measured center to center: 90604 (1.7 mi, South Whittier), 90605 (1.7 mi, Whittier), 90631 (2.3 mi, La Habra), 90602 (2.7 mi, Whittier), 90639 (3 mi, La Mirada) and 90638 (3.1 mi, La Mirada).

90603 ZIP Code, Whittier, CA

90603 is a ZIP code in Whittier, California in Los Angeles County. It covers 3.2 square miles of land. The closest ZIP codes are 90604, 90605 and 90631. 21,118 people live here in 6,504 households. At about 6,677 people per square mile it is built up to city-neighborhood density, and most homes are owner-occupied (79%). Median household income is $136,705, above the California median of $99,122.

Quick facts

Mailing city: Whittier, CA
County: Los Angeles County
Land area: 3.2 sq mi
Population: 21,118
Median household income: $136,705
Carrier routes: 15 (7,069 homes)

Key figures

Measure	Value
Residents	21,118
Households	6,504
Median household income	$136,705
Income per person	$50,125
Median age	40.8
Homeowners	78.5%
Median home value	$859,000
Median rent	$2,344
Bachelor's degree or higher	34.2%
Average commute (minutes)	32
Households with kids under 18	34.7%
Moved in the past year	3.5%
Below the poverty line	3.5%
Broadband internet	94.9%
Speak a non-English language at home	34.7%

Household income

% of households	Value
<$10K	2.5%
$10–15K	1.4%
$15–25K	1.6%
$25–35K	2.8%
$35–50K	4.5%
$50–75K	10.9%
$75–100K	12.1%
$100–150K	19.9%
$150–200K	14.1%
$200K+	30.1%

Age

% of all residents	Value
<10	10.0%
10–19	14.5%
20–24	5.6%
25–34	11.3%
35–44	14.7%
45–54	12.6%
55–64	15.1%
65–74	8.7%
75+	7.5%

Tenure

% of housing units	Value
Owned, with mortgage	51.0%
Owned outright	24.9%
Rented	20.6%
Vacant	3.6%

Type of building

% of housing units	Value
Detached house	83.0%
Townhome	4.6%
2–4 units	1.1%
5–19 units	3.1%
20+ units	7.0%
Mobile / other	1.1%

Businesses in 90603

458 business establishments with 5,612 employees (ZIP Codes Business Patterns 2023).

Health Care and Social Assistance: 88
Accommodation and Food Services: 55
Retail Trade: 52
Professional, Scientific, and Technical Services: 46
Other Services (except Public Administration): 45
Finance and Insurance: 38
Construction: 33
Real Estate and Rental and Leasing: 29

EDDM carrier routes

90603 has 15 USPS carrier routes with 7,069 residential and 456 business mailboxes. Open the EDDM route map.

Carrier routes in 90603

90603 has 15 USPS carrier routes (15 city (C)) with 7,069 residential and 456 business mailboxes. Routes range from 314 homes (C059) to 566 homes (C086); the median route has 478 homes. The Census counted 6,504 households in 90603 (2020–2024 average); USPS counts current mailboxes, including new and vacant homes.

Homes per route	Routes
1–249	0
250–499	10
500–749	5
750–999	0
1,000–1,499	0
1,500+	0

Best routes in 90603 for…

Most businesses

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

Route C058 — USPS business mailboxes 131, 507 homes
Route C082 — USPS business mailboxes 128, 466 homes
Route C060 — USPS business mailboxes 85, 486 homes
Route C079 — USPS business mailboxes 61, 529 homes
Route C051 — USPS business mailboxes 23, 538 homes

Select these 5 routes on the route map

Every carrier route in 90603

Route	Type	Homes	Businesses	Est. median income	Est. owners	Est. families with kids	Est. moved in past year
C051	City	538	23	$128,313	—	—	—
C054	City	466	8	$128,503	—	—	—
C058	City	507	131	$128,503	—	—	—
C059	City	314	1	$108,568	—	—	—
C060	City	486	85	$151,133	—	—	—
C061	City	338	1	$174,398	—	—	—
C066	City	478	5	$110,601	—	—	—
C073	City	478	0	$200,001+	—	—	—
C074	City	424	0	$112,028	—	—	—
C079	City	529	61	$106,810	—	—	—
C080	City	533	0	$128,313	—	—	—
C082	City	466	128	$112,028	—	—	—
C083	City	458	0	$108,568	—	—	—
C086	City	566	0	$121,228	—	—	—
C087	City	488	13	$115,021	—	—	—

Income, owners, families and movers are estimates for each route (how we estimate them); mailbox counts are current USPS figures. Open 90603 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

90604 — South Whittier CDP, CA (1.7 mi)
90605 — Whittier city, CA (1.7 mi)
90631 — La Habra city, CA (2.3 mi)
90602 — Whittier city, CA (2.7 mi)
90639 — La Mirada city, CA (3 mi)
90638 — La Mirada city, CA (3.1 mi)
91745 — Hacienda Heights CDP, CA (3.9 mi)
90670 — Santa Fe Springs city, CA (4.1 mi)

Areas that include 90603

Whittier, CA ZIP codes — 6 ZIP codes
Los Angeles County ZIP codes — 298 ZIP codes
California ZIP code data

Where it ranks

Mail every home in 90603

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) 90603, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.

Frequently asked questions

What city is 90603 in?: 90603 is a Whittier, CA mailing address. By land area, 100% lies inside Whittier.
What county is 90603 in?: 90603 is in Los Angeles County.
What is the population of 90603?: About 21,118 people (±1,445), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 21,174.
What is the median household income in 90603?: $136,705 (±$11,808), 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 90603?: 15 USPS carrier routes with 7,069 residential and 456 business mailboxes (7,548 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.
What ZIP codes are near 90603?: The closest, measured center to center: 90604 (1.7 mi, South Whittier), 90605 (1.7 mi, Whittier), 90631 (2.3 mi, La Habra), 90602 (2.7 mi, Whittier), 90639 (3 mi, La Mirada) and 90638 (3.1 mi, La Mirada).

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