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/19399

19399

ZIP 19399 is in Southeastern, Pennsylvania, in Chester County; area codes 484 and 610; Eastern time. Southeastern has 3 ZIP codes; the others are 19397 and 19398.

Type
No street area
Time zone
America/New_York
County
Chester
Coordinates
39.9832, -75.7481

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 19335, whose figures describe that area — not this ZIP code.

☼ Live from 19399 — Southeastern, PA

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Where 19399 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 19399
  • 🔢 Type 19399 into a pocket calculator and turn it upside down: GGEGI — not quite a word, sorry.
  • ➕ As a number, 19,399 = 19 × 1021. Its digits add up to 31, a total 799 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 100101111000111
  • 🏠 Its numerical neighbours: 19398 (Southeastern, PA, 0 mi away) and 19401 (Norristown, PA, 24 mi away).
  • 🔄 Backwards, 19399 becomes 99391, which is not a ZIP code at all.
  • 👥 4 other ZIP codes are made of exactly the same digits (19939, 31999, 93199, 99139). The farthest-flung twin is 93199 in Goleta, CA, 2,436 miles away.
  • 🧭 Farther north than 56% of all ZIP codes, and farther east than 85%.
  • 🎯1,207 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 19399 and you would come out at 39.98°S, 104.25°E — 853 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 15h 01m of daylight. Shortest: 9h 20m.
🌙 The sky over 19399 today
  • Working out the sun…
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  • Checking the USGS…

Source: USGS.

Business and tax activity

Business establishments7This ZIP7
Employees15This ZIP15
Annual payroll$916,000This ZIP$916,000

Land area

ZIP codes near 19399

ZIPCityDistance
19376 Wagontown, PA 0.0 mi
19397 Southeastern, PA 0.0 mi
19398 Southeastern, PA 0.0 mi
19421 Birchrunville, PA 0.0 mi
19372 Thorndale, PA 1.2 mi
19335 Downingtown, PA 3.1 mi
19358 Modena, PA 3.4 mi
19320 Coatesville, PA 4.7 mi
19354 Lyndell, PA 5.2 mi
19375 Unionville, PA 5.8 mi

Find every ZIP code within 10 miles of 19399 →

Questions about this ZIP code

Where is ZIP code 19399?

19399 is in Southeastern, Pennsylvania, in Chester County, part of the Philadelphia-Camden-Wilmington, PA-NJ-DE-MD metropolitan area. Its published point location is 39.9832, -75.7481.

What county is 19399 in?

19399 lies in Chester County.

What area code is 19399?

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

What time zone is 19399 in?

19399 uses America/New_York.

What ZIP codes are near 19399?

The closest are 19376 (0 mi), 19397 (0 mi), 19398 (0 mi), 19421 (0 mi) and 19372 (1.2 mi).

Is 19399 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. “19399 ZIP Code — Southeastern, Pennsylvania (Chester County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/19399

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curl https://zipcodes.pro/zip/19399.json

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