What city is 91108 in?

91108 is a San Marino, CA mailing address. By land area, 99% lies inside San Marino and 1% lies inside Pasadena.

What county is 91108 in?

91108 is in Los Angeles County.

What is the population of 91108?

About 12,401 people (±100), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 12,777.

What is the median household income in 91108?

$204,847 (±$32,194), 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 91108?

13 USPS carrier routes with 4,496 residential and 435 business mailboxes (4,939 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.

What ZIP codes are near 91108?

The closest, measured center to center: 91125 (1.2 mi, Pasadena), 91106 (1.4 mi, Pasadena), 91775 (1.6 mi, East San Gabriel), 91101 (2.2 mi, Pasadena), 91801 (2.3 mi, Alhambra) and 91030 (2.6 mi, South Pasadena).

91108 ZIP Code, San Marino, CA

91108 is a ZIP code in San Marino, California in Los Angeles County. It covers 3.8 square miles of land. The closest ZIP codes are 91125, 91106 and 91775. 12,401 people live here in 4,038 households. At about 3,273 people per square mile it has suburban density, and most homes are owner-occupied (82%). Median household income is $204,847, well above the California median of $99,122; the median age is 46.1, older than most ZIP codes.

Quick facts

Mailing city: San Marino, CA
County: Los Angeles County
Land area: 3.8 sq mi
Population: 12,401
Median household income: $204,847
Carrier routes: 13 (4,496 homes)

Key figures

Measure	Value
Residents	12,401
Households	4,038
Median household income	$204,847
Income per person	$101,946
Median age	46.1
Homeowners	82.0%
Median home value	$2,000,000+
Median rent	$3,501
Bachelor's degree or higher	82.5%
Average commute (minutes)	26.5
Households with kids under 18	35.0%
Moved in the past year	14.0%
Below the poverty line	6.6%
Broadband internet	98.7%
Speak a non-English language at home	55.9%

Household income

% of households	Value
<$10K	3.3%
$10–15K	0.9%
$15–25K	4.3%
$25–35K	0.4%
$35–50K	3.1%
$50–75K	8.9%
$75–100K	7.2%
$100–150K	12.0%
$150–200K	8.6%
$200K+	51.3%

Age

% of all residents	Value
<10	11.0%
10–19	13.4%
20–24	2.9%
25–34	10.4%
35–44	9.9%
45–54	14.8%
55–64	14.2%
65–74	13.6%
75+	9.9%

Tenure

% of housing units	Value
Owned, with mortgage	39.6%
Owned outright	33.0%
Rented	15.9%
Vacant	11.5%

Type of building

% of housing units	Value
Detached house	98.6%
Townhome	0.4%
2–4 units	0.9%
5–19 units	0.0%
20+ units	0.0%
Mobile / other	0.0%

Businesses in 91108

653 business establishments with 2,933 employees (ZIP Codes Business Patterns 2023).

Professional, Scientific, and Technical Services: 136
Health Care and Social Assistance: 91
Real Estate and Rental and Leasing: 89
Wholesale Trade: 59
Finance and Insurance: 53
Other Services (except Public Administration): 40
Retail Trade: 37
Accommodation and Food Services: 29

EDDM carrier routes

91108 has 13 USPS carrier routes with 4,496 residential and 435 business mailboxes. Open the EDDM route map.

Carrier routes in 91108

91108 has 13 USPS carrier routes (13 city (C)) with 4,496 residential and 435 business mailboxes. Routes range from 200 homes (C004) to 418 homes (C012); the median route has 361 homes. The Census counted 4,038 households in 91108 (2020–2024 average); USPS counts current mailboxes, including new and vacant homes.

Homes per route	Routes
1–249	1
250–499	12
500–749	0
750–999	0
1,000–1,499	0
1,500+	0

Best routes in 91108 for…

Most businesses

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

Route C004 — USPS business mailboxes 254, 200 homes
Route C001 — USPS business mailboxes 77, 351 homes
Route C007 — USPS business mailboxes 39, 379 homes
Route C022 — USPS business mailboxes 39, 320 homes
Route C002 — USPS business mailboxes 12, 397 homes

Select these 5 routes on the route map

Every carrier route in 91108

Route	Type	Homes	Businesses	Est. median income	Est. owners	Est. families with kids	Est. moved in past year
C001	City	351	77	$200,001+	—	—	—
C002	City	397	12	$200,001+	—	—	—
C004	City	200	254	$163,996	—	—	—
C005	City	284	4	$200,001+	—	—	—
C006	City	371	0	$120,801	—	—	—
C007	City	379	39	$200,001+	—	—	—
C008	City	296	0	$200,001+	—	—	—
C012	City	418	2	$164,758	—	—	—
C013	City	401	7	$142,516	—	—	—
C019	City	415	0	$163,996	—	—	—
C020	City	303	1	$160,135	—	—	—
C022	City	320	39	$200,001+	—	—	—
C023	City	361	0	$164,758	—	—	—

Income, owners, families and movers are estimates for each route (how we estimate them); mailbox counts are current USPS figures. Open 91108 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

91125 — Pasadena city, CA (1.2 mi)
91106 — Pasadena city, CA (1.4 mi)
91775 — East San Gabriel CDP, CA (1.6 mi)
91101 — Pasadena city, CA (2.2 mi)
91801 — Alhambra city, CA (2.3 mi)
91030 — South Pasadena city, CA (2.6 mi)
91776 — San Gabriel city, CA (2.6 mi)
91104 — Pasadena city, CA (3 mi)

Areas that include 91108

San Marino, CA ZIP codes — 1 ZIP code
Los Angeles County ZIP codes — 298 ZIP codes
California ZIP code data

Where it ranks

Mail every home in 91108

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) 91108, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.

Frequently asked questions

What city is 91108 in?: 91108 is a San Marino, CA mailing address. By land area, 99% lies inside San Marino and 1% lies inside Pasadena.
What county is 91108 in?: 91108 is in Los Angeles County.
What is the population of 91108?: About 12,401 people (±100), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 12,777.
What is the median household income in 91108?: $204,847 (±$32,194), 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 91108?: 13 USPS carrier routes with 4,496 residential and 435 business mailboxes (4,939 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.
What ZIP codes are near 91108?: The closest, measured center to center: 91125 (1.2 mi, Pasadena), 91106 (1.4 mi, Pasadena), 91775 (1.6 mi, East San Gabriel), 91101 (2.2 mi, Pasadena), 91801 (2.3 mi, Alhambra) and 91030 (2.6 mi, South Pasadena).

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