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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/94520

94520

ZIP 94520 is in Concord, California, in Contra Costa County; area code 925; Pacific time. Concord has 8 ZIP codes in all.

Type
Standard
Time zone
America/Los_Angeles
County
Contra Costa
Population
37,381
Coordinates
37.9930, -122.0353
☼ Live from 94520 — Concord, CA

Weather right now

Asking the National Weather Service…

NEXRAD radar
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Local time: —

Where 94520 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 94520
  • 🔢 Type 94520 into a pocket calculator and turn it upside down: OZShG — not quite a word, sorry.
  • ➕ As a number, 94,520 = 2 × 2 × 2 × 5 × 17 × 139. Its digits add up to 20, a total 2,586 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 10111000100111000
  • 🏠 Its numerical neighbours: 94519 (Concord, CA, 1 mi away) and 94521 (Concord, CA, 5 mi away).
  • 🔄 Backwards, 94520 becomes 02549, which is not a ZIP code at all.
  • 👥 50 other ZIP codes are made of exactly the same digits (02459, 02495, 04259, 04925, 04952, 05492, …). The farthest-flung twin is 09245 in APO AE, a military post office, 5,839 miles away.
  • 🧭 Farther south than 58% of all ZIP codes, and farther west than 96%.
  • 🎯1,264 miles west of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 94520 and you would come out at 37.99°S, 57.96°E — 993 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 9.9 square miles of land, 94520 is bigger than 27% of ZIP codes — room for about 7.5 Central Parks.
🌙 The sky over 94520 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population37,381This ZIP37,381
Households13,721This ZIP13,721
Housing units14,085This ZIP14,085
Median age35.0This ZIP35.0California37.9US 38.9
Median household income$82,479This ZIP$82,479California$99,122US $80,734
Median home value$601,000This ZIP$601,000California$734,700US $332,700
Median gross rent$2,197This ZIP$2,197California$2,036US $1,413
Bachelor's degree or higher29.0%This ZIP29.0%
Mean commute29.7 minThis ZIP29.7 min
Population density3,786.6 / sq miThis ZIP3,786.6 / sq mi

Business and tax activity

Business establishments2,028This ZIP2,028
Employees46,364This ZIP46,364
Annual payroll$3,388,845,000This ZIP$3,388,845,000
Tax returns filed16,760This ZIP16,760
Total adjusted gross income$1,259,452,000This ZIP$1,259,452,000

Land area

Land area9.87 sq miThis ZIP9.87 sq mi
Water area0.03 sq miThis ZIP0.03 sq mi

Other place names in 94520

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

ZIP codes near 94520

ZIPCityDistance
94522 Concord, CA 1.1 mi
94524 Concord, CA 1.1 mi
94529 Concord, CA 1.1 mi
94519 Concord, CA 1.3 mi
94518 Concord, CA 3.0 mi
94523 Pleasant Hill, CA 3.5 mi
94521 Concord, CA 4.5 mi
94527 Concord, CA 5.0 mi
94598 Walnut Creek, CA 5.4 mi
94597 Walnut Creek, CA 5.6 mi

Find every ZIP code within 10 miles of 94520 →

Questions about this ZIP code

Where is ZIP code 94520?

94520 is in Concord, California, in Contra Costa County, part of the San Francisco-Oakland-Fremont, CA metropolitan area. Its published point location is 37.9930, -122.0353.

What county is 94520 in?

94520 lies in Contra Costa County.

What area code is 94520?

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

What time zone is 94520 in?

94520 uses America/Los_Angeles.

How many people live in 94520?

About 37,381 people live in ZIP code 94520, in 13,721 households, at 3,786.6 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 94520?

$82,479 a year, against $99,122 across California.

What ZIP codes are near 94520?

The closest are 94522 (1.1 mi), 94524 (1.1 mi), 94529 (1.1 mi), 94519 (1.3 mi) and 94518 (3 mi).

Is 94520 a PO Box ZIP code?

94520 is a standard ZIP code. A normal ZIP code with street delivery.

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Cite this page

zipcodes.pro. “94520 ZIP Code — Concord, California (Contra Costa County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/94520

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