94121 ZIP Code, San Francisco, CA

94121 is a ZIP code in San Francisco, California in San Francisco County. It covers 2.5 square miles of land. The closest ZIP codes are 94122, 94118 and 94129. 41,995 people live here in 18,206 households. It is densely built, at about 16,566 people per square mile, and owners and renters are mixed (44% own). Median household income is $133,358, above the California median of $99,122.

Quick facts

Key figures

MeasureValue
Residents41,995
Households18,206
Median household income$133,358
Income per person$88,205
Median age44.5
Homeowners43.9%
Median home value$1,611,400
Median rent$2,363
Bachelor's degree or higher64.6%
Average commute (minutes)31.8
Households with kids under 1822.0%
Moved in the past year12.2%
Below the poverty line8.6%
Broadband internet93.7%
Speak a non-English language at home40.8%

Household income

% of householdsValue
<$10K4.6%
$10–15K2.5%
$15–25K3.5%
$25–35K3.3%
$35–50K5.2%
$50–75K9.0%
$75–100K10.7%
$100–150K15.2%
$150–200K12.8%
$200K+33.3%

Age

% of all residentsValue
<107.9%
10–199.0%
20–243.7%
25–3415.4%
35–4414.6%
45–5414.0%
55–6413.4%
65–7412.1%
75+10.0%

Tenure

% of housing unitsValue
Owned, with mortgage23.0%
Owned outright17.7%
Rented51.4%
Vacant7.9%

Type of building

% of housing unitsValue
Detached house21.2%
Townhome16.3%
2–4 units36.4%
5–19 units21.1%
20+ units4.8%
Mobile / other0.1%

Businesses in 94121

826 business establishments with 5,144 employees (ZIP Codes Business Patterns 2023).

EDDM carrier routes

94121 has 33 USPS carrier routes with 18,432 residential and 636 business mailboxes. Open the EDDM route map.

Carrier routes in 94121

94121 has 33 USPS carrier routes (33 city (C)) with 18,432 residential and 636 business mailboxes. Routes range from 228 homes (C013) to 757 homes (C024); the median route has 554 homes. The Census counted 18,206 households in 94121 (2020–2024 average); USPS counts current mailboxes, including new and vacant homes.

Homes per routeRoutes
1–2491
250–4997
500–74924
750–9991
1,000–1,4990
1,500+0

Best routes in 94121 for…

Most businesses

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

  1. Route C023 — USPS business mailboxes 110, 473 homes
  2. Route C046 — USPS business mailboxes 83, 556 homes
  3. Route C028 — USPS business mailboxes 75, 688 homes
  4. Route C005 — USPS business mailboxes 68, 504 homes
  5. Route C012 — USPS business mailboxes 41, 510 homes

Select these 5 routes on the route map

Every carrier route in 94121

RouteTypeHomesBusinessesEst. median incomeEst. ownersEst. families with kidsEst. moved in past year
C001City70637$100,857———
C002City2631$108,012———
C003City7116$164,496———
C004City6300$98,461———
C005City50468$170,610———
C006City5529$103,536———
C007City5837$100,857———
C008City67818$108,755———
C009City5251$103,536———
C010City5544$103,536———
C011City5369$100,857———
C012City51041$170,503———
C013City2280$125,616———
C014City4322$108,012———
C015City4645$169,711———
C016City5868$164,496———
C018City73318$170,503———
C019City5137$100,857———
C020City5383$103,124———
C021City4701$84,366———
C022City46719$117,053———
C023City473110$124,964———
C024City7576$98,461———
C025City63427$164,496———
C027City3984$128,265———
C028City68875$108,755———
C030City5780$103,124———
C031City63615$84,366———
C033City69032————
C036City6909$125,616———
C041City63910$103,536———
C044City5101$169,711———
C046City55683$100,857———

Income, owners, families and movers are estimates for each route (how we estimate them); mailbox counts are current USPS figures. Open 94121 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 94121

Where it ranks

Mail every home in 94121

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.

San Francisco EDDM mailing

EDDM guides

ZIP code statistics describe the Census ZIP Code Tabulation Area (ZCTA) 94121, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.

Frequently asked questions

What city is 94121 in?
94121 is a San Francisco, CA mailing address. By land area, 100% lies inside San Francisco.
What county is 94121 in?
94121 is in San Francisco County.
What is the population of 94121?
About 41,995 people (±1,949), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 43,115.
What is the median household income in 94121?
$133,358 (±$11,858), 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 94121?
33 USPS carrier routes with 18,432 residential and 636 business mailboxes (19,068 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.
What ZIP codes are near 94121?
The closest, measured center to center: 94122 (1.4 mi, San Francisco), 94118 (1.9 mi, San Francisco), 94129 (2.2 mi, San Francisco), 94116 (2.4 mi, San Francisco), 94117 (2.9 mi, San Francisco) and 94115 (3.2 mi, San Francisco).

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