94509 ZIP Code, Antioch, CA

94509 is a ZIP code in Antioch, California in Contra Costa County. It covers 17 square miles of land. The closest ZIP codes are 94531, 94565 and 94561. 70,090 people live here in 23,476 households, more than in 9 of every 10 California ZIP codes. At about 4,018 people per square mile it is built up to city-neighborhood density, and owners and renters are mixed (58% own). Median household income is $86,196, below the California median of $99,122.

Quick facts

Key figures

MeasureValue
Residents70,090
Households23,476
Median household income$86,196
Income per person$37,545
Median age38.1
Homeowners58.0%
Median home value$584,100
Median rent$2,062
Bachelor's degree or higher18.3%
Average commute (minutes)40.5
Households with kids under 1838.6%
Moved in the past year8.9%
Below the poverty line13.4%
Broadband internet95.1%
Speak a non-English language at home39.4%

Household income

% of householdsValue
<$10K5.4%
$10–15K2.8%
$15–25K3.4%
$25–35K7.2%
$35–50K9.7%
$50–75K16.2%
$75–100K12.8%
$100–150K18.4%
$150–200K10.9%
$200K+13.2%

Age

% of all residentsValue
<1012.7%
10–1913.2%
20–246.1%
25–3413.4%
35–4414.0%
45–5412.3%
55–6413.0%
65–7410.2%
75+5.1%

Tenure

% of housing unitsValue
Owned, with mortgage38.9%
Owned outright17.2%
Rented40.2%
Vacant3.7%

Type of building

% of housing unitsValue
Detached house70.7%
Townhome6.9%
2–4 units5.4%
5–19 units6.4%
20+ units8.8%
Mobile / other1.8%

Businesses in 94509

979 business establishments with 12,352 employees (ZIP Codes Business Patterns 2023).

EDDM carrier routes

94509 has 43 USPS carrier routes with 23,386 residential and 1,438 business mailboxes. Open the EDDM route map.

Carrier routes in 94509

94509 has 43 USPS carrier routes (39 city (C), 4 rural (R)) with 23,386 residential and 1,438 business mailboxes. Routes range from 215 homes (R021) to 954 homes (C033); the median route has 515 homes. The Census counted 23,476 households in 94509 (2020–2024 average); USPS counts current mailboxes, including new and vacant homes.

Homes per routeRoutes
1–2492
250–49917
500–74919
750–9995
1,000–1,4990
1,500+0

Best routes in 94509 for…

Most businesses

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

  1. Route C001 — USPS business mailboxes 185, 446 homes
  2. Route C039 — USPS business mailboxes 154, 385 homes
  3. Route R001 — USPS business mailboxes 129, 790 homes
  4. Route C006 — USPS business mailboxes 93, 457 homes
  5. Route C012 — USPS business mailboxes 93, 414 homes

Select these 5 routes on the route map

Every carrier route in 94509

RouteTypeHomesBusinessesEst. median incomeEst. ownersEst. families with kidsEst. moved in past year
C001City446185$49,814———
C003City61623$41,208———
C004City69420$80,772———
C006City45793$56,879———
C007City83613$57,176———
C008City5598$73,383———
C009City51758$80,772———
C011City4950$97,312———
C012City41493$68,744———
C013City91258$46,138———
C014City51011$81,381———
C015City53037$73,383———
C016City4790$106,440———
C017City48268$70,378———
C018City3252$106,147———
C020City51516$102,788———
C021City4330$88,839———
C022City68264$112,550———
C023City89520$86,961———
C024City5190$67,472———
C025City4830$68,744———
C026City5560$88,839———
C027City52132$117,866———
C028City48525$46,138———
C029City5260$117,866———
C032City6580$150,911———
C033City95433$57,176———
C034City5691$102,218———
C035City48115$102,788———
C039City385154$87,019———
C040City4870$106,440———
C048City52928$101,192———
C049City51343$124,302———
C050City4331$58,686———
C051City65479$110,460———
C070City5958$56,879———
C074City5283$106,147———
C075City4993$57,176———
C085City24929$102,788———
R001Rural790129$109,292———
R002Rural47779$73,383———
R003Rural4835$97,312———
R021Rural2152$97,636———

Income, owners, families and movers are estimates for each route (how we estimate them); mailbox counts are current USPS figures. Open 94509 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 94509

Where it ranks

Mail every home in 94509

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) 94509, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.

Frequently asked questions

What city is 94509 in?
94509 is a Antioch, CA mailing address. By land area, 86% lies inside Antioch and 2% lies inside Pittsburg; the rest is outside any Census-defined city or community.
What county is 94509 in?
94509 is in Contra Costa County.
What is the population of 94509?
About 70,090 people (±1,916), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 69,931.
What is the median household income in 94509?
$86,196 (±$6,094), 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 94509?
43 USPS carrier routes with 23,386 residential and 1,438 business mailboxes (24,825 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.
What ZIP codes are near 94509?
The closest, measured center to center: 94531 (3.1 mi, Antioch), 94565 (6.4 mi, Pittsburg), 94561 (6.6 mi, Oakley), 94517 (8.2 mi, Clayton), 94513 (8.3 mi, Brentwood) and 94548 (8.9 mi, Knightsen).

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