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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/94803

94803

ZIP 94803 is in El Sobrante, California, in Contra Costa County; area codes 510 and 341; Pacific time. El Sobrante has 2 ZIP codes; the other is 94820.

Type
Standard
Time zone
America/Los_Angeles
County
Contra Costa
Population
27,659
Coordinates
37.9568, -122.2824
☼ Live from 94803 — El Sobrante, CA

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Where 94803 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 94803
  • 🔢 Type 94803 into a pocket calculator and turn it upside down: EOBhG — not quite a word, sorry.
  • ➕ As a number, 94,803 = 3 × 31601. Its digits add up to 24, a total 2,425 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 10111001001010011
  • 🏠 Its numerical neighbours: 94802 (Richmond, CA, 4 mi away) and 94804 (Richmond, CA, 4 mi away).
  • 🔄 Backwards, 94803 becomes 30849, which is not a ZIP code at all.
  • 👥 39 other ZIP codes are made of exactly the same digits (03849, 03894, 04938, 04983, 08349, 09834, …). The farthest-flung twin is 09834 in FPO AE, a military post office, 7,979 miles away.
  • 🧭 Farther south than 58% of all ZIP codes, and farther west than 96%.
  • 🎯1,277 miles west of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 94803 and you would come out at 37.96°S, 57.72°E — 1,002 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 32m.
  • 📏 At 12.8 square miles of land, 94803 is bigger than 30% of ZIP codes — room for about 9.7 Central Parks.
🌙 The sky over 94803 today
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🌋 Shake report
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Source: USGS.

People and housing

Population27,659This ZIP27,659
Households9,562This ZIP9,562
Housing units10,127This ZIP10,127
Median age42.3This ZIP42.3California37.9US 38.9
Median household income$118,447This ZIP$118,447California$99,122US $80,734
Median home value$783,900This ZIP$783,900California$734,700US $332,700
Median gross rent$2,302This ZIP$2,302California$2,036US $1,413
Bachelor's degree or higher41.8%This ZIP41.8%
Mean commute35.4 minThis ZIP35.4 min
Population density2,157.7 / sq miThis ZIP2,157.7 / sq mi

Business and tax activity

Business establishments374This ZIP374
Employees2,054This ZIP2,054
Annual payroll$89,932,000This ZIP$89,932,000
Tax returns filed12,610This ZIP12,610
Total adjusted gross income$1,167,274,000This ZIP$1,167,274,000

Land area

Land area12.82 sq miThis ZIP12.82 sq mi
Water area0.00 sq mi

Other place names in 94803

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

ZIP codes near 94803

ZIPCityDistance
94820 El Sobrante, CA 1.6 mi
94564 Pinole, CA 2.4 mi
94805 Richmond, CA 2.5 mi
94530 El Cerrito, CA 2.7 mi
94806 San Pablo, CA 3.3 mi
94547 Hercules, CA 3.7 mi
94802 Richmond, CA 3.8 mi
94807 Richmond, CA 3.8 mi
94808 Richmond, CA 3.8 mi
94850 Richmond, CA 3.8 mi

Find every ZIP code within 10 miles of 94803 →

Questions about this ZIP code

Where is ZIP code 94803?

94803 is in El Sobrante, California, in Contra Costa County, part of the San Francisco-Oakland-Fremont, CA metropolitan area. Its published point location is 37.9568, -122.2824.

What county is 94803 in?

94803 lies in Contra Costa County.

What area code is 94803?

El Sobrante uses area codes 510 and 341, from NANPA's telephone records.

What time zone is 94803 in?

94803 uses America/Los_Angeles.

How many people live in 94803?

About 27,659 people live in ZIP code 94803, in 9,562 households, at 2,157.7 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 94803?

$118,447 a year, against $99,122 across California.

What ZIP codes are near 94803?

The closest are 94820 (1.6 mi), 94564 (2.4 mi), 94805 (2.5 mi), 94530 (2.7 mi) and 94806 (3.3 mi).

Is 94803 a PO Box ZIP code?

94803 is a standard ZIP code. A normal ZIP code with street delivery.

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Cite this page

zipcodes.pro. “94803 ZIP Code — El Sobrante, California (Contra Costa County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/94803

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