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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/16638

16638

ZIP 16638 is Entriken, Pennsylvania, in Huntingdon County; area code 814; Eastern time.

Type
Standard
Time zone
America/New_York
County
Huntingdon
Metro area
Huntingdon, PA
Population
58
Coordinates
40.3382, -78.2010
☼ Live from 16638 — Entriken, PA

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Local time: —

Where 16638 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 16638
  • 🔢 Type 16638 into a pocket calculator and turn it upside down: BEggI — not quite a word, sorry.
  • ➕ As a number, 16,638 = 2 × 3 × 47 × 59. Its digits add up to 24, a total 2,425 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 100000011111110
  • 🏠 Its numerical neighbours: 16637 (East Freedom, PA, 14 mi away) and 16639 (Fallentimber, PA, 27 mi away).
  • 🔄 Backwards, 16638 becomes 83661 — and that is a real ZIP code: Payette, ID, 1,969 miles away.
  • 👥 20 other ZIP codes are made of exactly the same digits (13668, 16368, 16683, 16836, 16863, 18636, …). The farthest-flung twin is 83661 in Payette, ID, 1,969 miles away.
  • 🧭 Farther north than 59% of all ZIP codes, and farther east than 78%.
  • 🎯1,075 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 16638 and you would come out at 40.34°S, 101.80°E — 973 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 15h 03m of daylight. Shortest: 9h 17m.
  • 📏 At 0.934 square miles of land, 16638 is bigger than 8% of ZIP codes — about 452 football fields.
🌙 The sky over 16638 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population58This ZIP58
Households22This ZIP22
Housing units49This ZIP49
Median age34.5This ZIP34.5Pennsylvania40.9US 38.9
Median household income$86,500This ZIP$86,500Pennsylvania$77,971US $80,734
Median home value$214,300This ZIP$214,300Pennsylvania$254,500US $332,700
Bachelor's degree or higher44.7%This ZIP44.7%
Mean commute26.5 minThis ZIP26.5 min
Population density62.1 / sq miThis ZIP62.1 / sq mi

Business and tax activity

Business establishments3This ZIP3
Employees32This ZIP32
Annual payroll$2,663,000This ZIP$2,663,000

Land area

Land area0.93 sq miThis ZIP0.93 sq mi
Water area0.00 sq mi

ZIP codes near 16638

ZIPCityDistance
16657 James Creek, PA 2.1 mi
16647 Hesston, PA 5.5 mi
16662 Martinsburg, PA 5.9 mi
16622 Calvin, PA 7.0 mi
16621 Broad Top, PA 7.3 mi
16685 Todd, PA 7.5 mi
16678 Saxton, PA 7.9 mi
16693 Williamsburg, PA 8.9 mi
16634 Dudley, PA 8.9 mi
16631 Curryville, PA 9.0 mi

Find every ZIP code within 10 miles of 16638 →

Questions about this ZIP code

Where is ZIP code 16638?

16638 is in Entriken, Pennsylvania, in Huntingdon County, part of the Huntingdon, PA micropolitan area. Its published point location is 40.3382, -78.2010.

What county is 16638 in?

16638 lies in Huntingdon County.

What area code is 16638?

Entriken uses area code 814, from NANPA's telephone records.

What time zone is 16638 in?

16638 uses America/New_York.

How many people live in 16638?

About 58 people live in ZIP code 16638, in 22 households, at 62.1 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 16638?

$86,500 a year, against $77,971 across Pennsylvania.

What ZIP codes are near 16638?

The closest are 16657 (2.1 mi), 16647 (5.5 mi), 16662 (5.9 mi), 16622 (7 mi) and 16621 (7.3 mi).

Is 16638 a PO Box ZIP code?

16638 is a standard ZIP code. A normal ZIP code with street delivery.

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zipcodes.pro. “16638 ZIP Code — Entriken, Pennsylvania (Huntingdon County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/16638

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