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ZIP stands for Zone Improvement Plan. The codes went live on July 1, 1963.The lowest ZIP code is 00501 — the IRS in Holtsville, New York.The highest ZIP code is 99950, in Ketchikan, Alaska.Type 07734 into a calculator and turn it upside down: hELLO. It is Keansburg, New Jersey.12345 belongs to one company: General Electric in Schenectady, New York.The first digit is a region: 0 is New England and New Jersey, 9 is the West Coast, Alaska and Hawaii.Mr. ZIP, the cartoon mailman, was the mascot that sold the idea to America.ZIP+4 arrived in 1983 and can narrow a ZIP down to one side of one block.A ZIP code is a mail route, not a place: plenty of them cross county and even state lines.Play ZIP Hunt: guess the secret ZIP code of the day in six tries.
zipcodes.pro — ZIP/94509

94509

ZIP 94509 is in Antioch, California, in Contra Costa County; area code 925; Pacific time. Antioch has 2 ZIP codes; the other is 94531.

Type
Standard
Time zone
America/Los_Angeles
County
Contra Costa
Population
70,090
Coordinates
37.9920, -121.8126
☼ Live from 94509 — Antioch, CA

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Where 94509 is

Approximate ZIP boundary (Census ZCTA 2020). ZIP codes are mail routes, not areas, so the shape shown is the Census tabulation area that approximates it.

★ Weird and wonderful facts about 94509
  • 🔢 Type 94509 into a pocket calculator and turn it upside down: GOShG — not quite a word, sorry.
  • ➕ As a number, 94,509 = 3 × 3 × 10501. Its digits add up to 27, a total 1,806 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 10111000100101101
  • 🏠 Its numerical neighbours: 94508 (Angwin, CA, 53 mi away) and 94510 (Benicia, CA, 19 mi away).
  • 🔄 Backwards, 94509 becomes 90549, which is not a ZIP code at all.
  • 👥 17 other ZIP codes are made of exactly the same digits (09459, 09495, 40995, 49095, 49509, 49905, …). The farthest-flung twin is 09459 in APO AE, a military post office, 5,313 miles away.
  • 🧭 Farther south than 58% of all ZIP codes, and farther west than 95%.
  • 🎯1,252 miles west of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 94509 and you would come out at 37.99°S, 58.19°E — 986 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 48m of daylight. Shortest: 9h 31m.
  • 📏 At 17.4 square miles of land, 94509 is bigger than 35% of ZIP codes — room for about 13 Central Parks.
🌙 The sky over 94509 today
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🌋 Shake report
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Source: USGS.

People and housing

Population70,090This ZIP70,090
Households23,476This ZIP23,476
Housing units24,390This ZIP24,390
Median age38.1This ZIP38.1California37.9US 38.9
Median household income$86,196This ZIP$86,196California$99,122US $80,734
Median home value$584,100This ZIP$584,100California$734,700US $332,700
Median gross rent$2,062This ZIP$2,062California$2,036US $1,413
Bachelor's degree or higher18.3%This ZIP18.3%
Mean commute40.5 minThis ZIP40.5 min
Population density4,017.8 / sq miThis ZIP4,017.8 / sq mi

Business and tax activity

Business establishments979This ZIP979
Employees12,352This ZIP12,352
Annual payroll$756,442,000This ZIP$756,442,000
Tax returns filed30,170This ZIP30,170
Total adjusted gross income$1,920,876,000This ZIP$1,920,876,000

Land area

Land area17.45 sq miThis ZIP17.45 sq mi
Water area0.23 sq miThis ZIP0.23 sq mi

Other place names in 94509

Census places whose land this ZIP code overlaps. The Postal Service may accept other city names in an address, too.

ZIP codes near 94509

ZIPCityDistance
94531 Antioch, CA 3.1 mi
94565 Pittsburg, CA 6.4 mi
94561 Oakley, CA 6.6 mi
94517 Clayton, CA 8.2 mi
94513 Brentwood, CA 8.3 mi
94527 Concord, CA 8.3 mi
94548 Knightsen, CA 8.9 mi
94521 Concord, CA 9.0 mi
94512 Birds Landing, CA 9.6 mi
94511 Bethel Island, CA 10.3 mi

Find every ZIP code within 10 miles of 94509 →

Questions about this ZIP code

Where is ZIP code 94509?

94509 is in Antioch, California, in Contra Costa County, part of the San Francisco-Oakland-Fremont, CA metropolitan area. Its published point location is 37.9920, -121.8126.

What county is 94509 in?

94509 lies in Contra Costa County.

What area code is 94509?

Antioch uses area code 925, from NANPA's telephone records.

What time zone is 94509 in?

94509 uses America/Los_Angeles.

How many people live in 94509?

About 70,090 people live in ZIP code 94509, in 23,476 households, at 4,017.8 people per square mile. These are American Community Survey 5-year estimates for the ZIP Code Tabulation Area, not a headcount.

What is the median household income in 94509?

$86,196 a year, against $99,122 across California.

What ZIP codes are near 94509?

The closest are 94531 (3.1 mi), 94565 (6.4 mi), 94561 (6.6 mi), 94517 (8.2 mi) and 94513 (8.3 mi).

Is 94509 a PO Box ZIP code?

94509 is a standard ZIP code. A normal ZIP code with street delivery.

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Cite this page

zipcodes.pro. “94509 ZIP Code — Antioch, California (Contra Costa County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/94509

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