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/13603

13603

ZIP 13603 is in Watertown, New York, in Jefferson County; area codes 315 and 680; Eastern time. Watertown has 2 ZIP codes; the other is 13601.

Type
Standard
Time zone
America/New_York
County
Jefferson
Population
14,136
Coordinates
44.0299, -75.8036
☼ Live from 13603 — Watertown, NY

Weather right now

Asking the National Weather Service…

NEXRAD radar
Finding the nearest radar…
Local time: —

Where 13603 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 13603
  • 🔢 Type 13603 into a pocket calculator and turn it upside down: EOgEI — not quite a word, sorry.
  • ➕ As a number, 13,603 = 61 × 223. Its digits add up to 13, a total 1,179 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 11010100100011
  • 🏠 Its numerical neighbours: 13602 (Fort Drum, NY, 3 mi away) and 13605 (Adams, NY, 20 mi away).
  • 🔄 Backwards, 13603 becomes 30631 — and that is a real ZIP code: Crawfordville, GA, 817 miles away.
  • 👥 34 other ZIP codes are made of exactly the same digits (06133, 06331, 13036, 13063, 13360, 13630, …). The farthest-flung twin is 33106 in Miami, FL, 1,281 miles away.
  • 🧭 Farther north than 87% of all ZIP codes, and farther east than 85%.
  • 🎯1,202 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 13603 and you would come out at 44.03°S, 104.20°E — 1,046 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 15h 29m of daylight. Shortest: 8h 53m.
  • 📏 At 5.5 square miles of land, 13603 is bigger than 20% of ZIP codes — room for about 4.2 Central Parks.
🌙 The sky over 13603 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population14,136This ZIP14,136
Households5,122This ZIP5,122
Housing units5,299This ZIP5,299
Median age24.0This ZIP24.0New York39.8US 38.9
Median household income$62,500This ZIP$62,500New York$85,974US $80,734
Median gross rent$1,627This ZIP$1,627New York$1,621US $1,413
Bachelor's degree or higher36.8%This ZIP36.8%
Mean commute12.2 minThis ZIP12.2 min
Population density2,553.0 / sq miThis ZIP2,553.0 / sq mi

Business and tax activity

Business establishments7This ZIP7
Employees48This ZIP48
Annual payroll$1,531,000This ZIP$1,531,000
Tax returns filed3,440This ZIP3,440
Total adjusted gross income$176,887,000This ZIP$176,887,000

Land area

Land area5.54 sq miThis ZIP5.54 sq mi
Water area0.03 sq miThis ZIP0.03 sq mi

Other place names in 13603

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

ZIP codes near 13603

ZIPCityDistance
13638 Felts Mills, NY 2.6 mi
13616 Calcium, NY 2.7 mi
13602 Fort Drum, NY 3.0 mi
13612 Black River, NY 3.5 mi
13643 Great Bend, NY 4.3 mi
13637 Evans Mills, NY 5.5 mi
13628 Deferiet, NY 6.0 mi
13601 Watertown, NY 6.8 mi
13615 Brownville, NY 9.1 mi
13619 Carthage, NY 11.1 mi

Find every ZIP code within 10 miles of 13603 →

Questions about this ZIP code

Where is ZIP code 13603?

13603 is in Watertown, New York, in Jefferson County, part of the Watertown-Fort Drum, NY metropolitan area. Its published point location is 44.0299, -75.8036.

What county is 13603 in?

13603 lies in Jefferson County.

What area code is 13603?

Watertown uses area codes 315 and 680, from NANPA's telephone records.

What time zone is 13603 in?

13603 uses America/New_York.

How many people live in 13603?

About 14,136 people live in ZIP code 13603, in 5,122 households, at 2,553.0 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 13603?

$62,500 a year, against $85,974 across New York.

What ZIP codes are near 13603?

The closest are 13638 (2.6 mi), 13616 (2.7 mi), 13602 (3 mi), 13612 (3.5 mi) and 13643 (4.3 mi).

Is 13603 a PO Box ZIP code?

13603 is a standard ZIP code. A normal ZIP code with street delivery.

Download or cite

Cite this page

zipcodes.pro. “13603 ZIP Code — Watertown, New York (Jefferson County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/13603

Machine-readable version of these facts:

curl https://zipcodes.pro/zip/13603.json

Underlying data is public domain or openly licensed — sources, vintages and licences.