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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/95603

95603

ZIP 95603 is in Auburn, California, mostly in Placer County; area codes 530 and 837; Pacific time. Auburn has 3 ZIP codes; the others are 95602 and 95604.

Type
Standard
Time zone
America/Los_Angeles
County
Placer +1 more
Population
28,432
Coordinates
38.9113, -121.0858
☼ Live from 95603 — Auburn, CA

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Local time: —

Where 95603 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 95603
  • 🔢 Type 95603 into a pocket calculator and turn it upside down: EOgSG — not quite a word, sorry.
  • ➕ 95603 is a prime number. It cannot be divided by anything except 1 and itself. Its digits add up to 23, a total 2,533 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 10111010101110011
  • 🏠 Its numerical neighbours: 95602 (Auburn, CA, 6 mi away) and 95604 (Auburn, CA, 59 mi away).
  • 🔄 Backwards, 95603 becomes 30659, which is not a ZIP code at all.
  • 👥 37 other ZIP codes are made of exactly the same digits (06359, 35096, 35609, 35906, 35960, 36509, …). The farthest-flung twin is 96350 in FPO AA, a military post office, 5,174 miles away.
  • 🧭 Farther south than 51% of all ZIP codes, and farther west than 94%.
  • 🎯1,201 miles west of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 95603 and you would come out at 38.91°S, 58.91°E — 911 miles from Port-aux-Français, French Southern Territories, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 54m of daylight. Shortest: 9h 26m.
  • 📏 At 35.8 square miles of land, 95603 is bigger than 50% of ZIP codes — room for about 27 Central Parks.
🌙 The sky over 95603 today
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🌋 Shake report
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Source: USGS.

People and housing

Population28,432This ZIP28,432
Households11,738This ZIP11,738
Housing units12,467This ZIP12,467
Median age48.6This ZIP48.6California37.9US 38.9
Median household income$85,357This ZIP$85,357California$99,122US $80,734
Median home value$650,500This ZIP$650,500California$734,700US $332,700
Median gross rent$1,565This ZIP$1,565California$2,036US $1,413
Bachelor's degree or higher33.6%This ZIP33.6%
Mean commute24.1 minThis ZIP24.1 min
Population density795.0 / sq miThis ZIP795.0 / sq mi

Business and tax activity

Business establishments1,200This ZIP1,200
Employees12,350This ZIP12,350
Annual payroll$635,511,000This ZIP$635,511,000
Tax returns filed13,160This ZIP13,160
Total adjusted gross income$1,403,829,000This ZIP$1,403,829,000

Land area

Land area35.76 sq miThis ZIP35.76 sq mi
Water area0.66 sq miThis ZIP0.66 sq mi

Counties 95603 spans

A ZIP code is a mail route and ignores county lines. Shares are by overlapping land area.

CountyShare of this ZIP
Placer County 100.0%
El Dorado County 0.0%

Other place names in 95603

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

ZIP codes near 95603

ZIPCityDistance
95658 Newcastle, CA 4.9 mi
95602 Auburn, CA 5.6 mi
95614 Cool, CA 6.0 mi
95663 Penryn, CA 6.4 mi
95722 Meadow Vista, CA 7.3 mi
95703 Applegate, CA 7.5 mi
95664 Pilot Hill, CA 8.0 mi
95650 Loomis, CA 8.4 mi
95635 Greenwood, CA 9.5 mi
95651 Lotus, CA 10.2 mi

Find every ZIP code within 10 miles of 95603 →

Questions about this ZIP code

Where is ZIP code 95603?

95603 is in Auburn, California, in Placer County, part of the Sacramento-Roseville-Folsom, CA metropolitan area. Its published point location is 38.9113, -121.0858.

What county is 95603 in?

95603 spans 2 counties: Placer County and El Dorado County. Most of it falls in Placer County, measured by overlapping land area — the county holding the most land in a ZIP code is not always the one holding the most residents.

What area code is 95603?

Auburn uses area codes 530 and 837, from NANPA's telephone records.

What time zone is 95603 in?

95603 uses America/Los_Angeles.

How many people live in 95603?

About 28,432 people live in ZIP code 95603, in 11,738 households, at 795.0 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 95603?

$85,357 a year, against $99,122 across California.

What ZIP codes are near 95603?

The closest are 95658 (4.9 mi), 95602 (5.6 mi), 95614 (6 mi), 95663 (6.4 mi) and 95722 (7.3 mi).

Is 95603 a PO Box ZIP code?

95603 is a standard ZIP code. A normal ZIP code with street delivery.

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Cite this page

zipcodes.pro. “95603 ZIP Code — Auburn, California (Placer County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/95603

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