Every ZIP code in the United States, with weather, radar, trivia and the numbers behind it. Five digits since 1963!

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/19603

19603

ZIP 19603 is in Reading, Pennsylvania, in Berks County; area codes 610, 484 and 835; Eastern time. Reading has 12 ZIP codes in all.

Type
No street area
Time zone
America/New_York
County
Berks
Metro area
Reading, PA
Coordinates
40.3884, -75.9631

The Census map gives this ZIP code no delivery area of its own, which usually means it serves post office boxes, a single organization or a post office rather than streets of homes.

This ZIP code has no Census tabulation area of its own. Its point falls inside ZCTA 19605, whose figures describe that area — not this ZIP code.

☼ Live from 19603 — Reading, PA

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Where 19603 is

This ZIP code has no Census tabulation area, so there is no boundary to draw — the marker is its published point location.

★ Weird and wonderful facts about 19603
  • 🔢 Type 19603 into a pocket calculator and turn it upside down: EOgGI — not quite a word, sorry.
  • ➕ 19603 is a prime number. It cannot be divided by anything except 1 and itself. Its digits add up to 19, a total 2,454 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 100110010010011
  • 🏠 Its numerical neighbours: 19602 (Reading, PA, 5 mi away) and 19604 (Reading, PA, 4 mi away).
  • 🔄 Backwards, 19603 becomes 30691, which is not a ZIP code at all.
  • 👥 53 other ZIP codes are made of exactly the same digits (01936, 06913, 09136, 09613, 10963, 13069, …). The farthest-flung twin is 96310 in FPO AA, a military post office, 6,982 miles away.
  • 🧭 Farther north than 60% of all ZIP codes, and farther east than 85%.
  • 🎯1,193 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 19603 and you would come out at 40.39°S, 104.04°E — 879 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 15h 03m of daylight. Shortest: 9h 17m.
🌙 The sky over 19603 today
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🌋 Shake report
  • Checking the USGS…

Source: USGS.

Business and tax activity

Business establishments21This ZIP21
Employees324This ZIP324
Annual payroll$42,891,000This ZIP$42,891,000

Land area

ZIP codes near 19603

ZIPCityDistance
19605 Reading, PA 1.1 mi
19601 Reading, PA 2.5 mi
19533 Leesport, PA 3.0 mi
19610 Reading, PA 3.3 mi
19604 Reading, PA 3.5 mi
19560 Temple, PA 4.5 mi
19611 Reading, PA 4.5 mi
19609 Reading, PA 4.5 mi
19602 Reading, PA 4.9 mi
19612 Reading, PA 5.4 mi

Find every ZIP code within 10 miles of 19603 →

Questions about this ZIP code

Where is ZIP code 19603?

19603 is in Reading, Pennsylvania, in Berks County, part of the Reading, PA metropolitan area. Its published point location is 40.3884, -75.9631.

What county is 19603 in?

19603 lies in Berks County.

What area code is 19603?

Reading uses area codes 610, 484 and 835, from NANPA's telephone records.

What time zone is 19603 in?

19603 uses America/New_York.

What ZIP codes are near 19603?

The closest are 19605 (1.1 mi), 19601 (2.5 mi), 19533 (3 mi), 19610 (3.3 mi) and 19604 (3.5 mi).

Is 19603 a PO Box ZIP code?

Possibly. The Census map gives this ZIP code no delivery area of its own, which usually means it serves post office boxes, a single organization or a post office rather than streets of homes.

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Cite this page

zipcodes.pro. “19603 ZIP Code — Reading, Pennsylvania (Berks County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/19603

Machine-readable version of these facts:

curl https://zipcodes.pro/zip/19603.json

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