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/16821

16821

ZIP 16821 is Allport, Pennsylvania, in Clearfield County; area codes 814 and 582; Eastern time.

Type
Standard
Time zone
America/New_York
County
Clearfield
Metro area
DuBois, PA
Population
93
Coordinates
40.9578, -78.1946
☼ Live from 16821 — Allport, PA

Weather right now

Asking the National Weather Service…

NEXRAD radar
Finding the nearest radar…
Local time: —

Where 16821 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 16821
  • 🔢 Type 16821 into a pocket calculator and turn it upside down: IZBgI — not quite a word, sorry.
  • ➕ As a number, 16,821 = 3 × 3 × 3 × 7 × 89. Its digits add up to 18, a total 2,332 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 100000110110101
  • 🏠 Its numerical neighbours: 16820 (Aaronsburg, PA, 42 mi away) and 16822 (Beech Creek, PA, 28 mi away).
  • 🔄 Backwards, 16821 becomes 12861 — and that is a real ZIP code: Putnam Station, NY, 311 miles away.
  • 👥 19 other ZIP codes are made of exactly the same digits (12168, 12186, 12816, 12861, 16218, 18216, …). The farthest-flung twin is 81612 in Aspen, CO, 1,515 miles away.
  • 🧭 Farther north than 66% of all ZIP codes, and farther east than 78%.
  • 🎯1,073 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 16821 and you would come out at 40.96°S, 101.81°E — 996 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 15h 07m of daylight. Shortest: 9h 13m.
  • 📏 At 1.4 square miles of land, 16821 is bigger than 10% of ZIP codes — room for about 1.0 Central Parks.
🌙 The sky over 16821 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population93This ZIP93
Households37This ZIP37
Housing units37This ZIP37
Median age33.4This ZIP33.4Pennsylvania40.9US 38.9
Bachelor's degree or higher100.0%This ZIP100.0%
Population density67.5 / sq miThis ZIP67.5 / sq mi

Business and tax activity

Business establishments4This ZIP4
Employees31This ZIP31
Annual payroll$516,000This ZIP$516,000
Tax returns filed160This ZIP160
Total adjusted gross income$9,714,000This ZIP$9,714,000

Land area

Land area1.38 sq miThis ZIP1.38 sq mi
Water area0.00 sq miThis ZIP0.00 sq mi

Other place names in 16821

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

ZIP codes near 16821

ZIPCityDistance
16860 Munson, PA 1.6 mi
16840 Hawk Run, PA 2.4 mi
16879 Winburne, PA 2.8 mi
16847 Kylertown, PA 3.2 mi
16858 Morrisdale, PA 3.2 mi
16849 Lanse, PA 4.1 mi
16876 Wallaceton, PA 4.9 mi
16839 Grassflat, PA 5.6 mi
16825 Bigler, PA 6.4 mi
16866 Philipsburg, PA 6.5 mi

Find every ZIP code within 10 miles of 16821 →

Questions about this ZIP code

Where is ZIP code 16821?

16821 is in Allport, Pennsylvania, in Clearfield County, part of the DuBois, PA micropolitan area. Its published point location is 40.9578, -78.1946.

What county is 16821 in?

16821 lies in Clearfield County.

What area code is 16821?

Allport uses area codes 814 and 582, from NANPA's telephone records.

What time zone is 16821 in?

16821 uses America/New_York.

How many people live in 16821?

About 93 people live in ZIP code 16821, in 37 households, at 67.5 people per square mile. These are American Community Survey 5-year estimates for the ZIP Code Tabulation Area, not a headcount.

What ZIP codes are near 16821?

The closest are 16860 (1.6 mi), 16840 (2.4 mi), 16879 (2.8 mi), 16847 (3.2 mi) and 16858 (3.2 mi).

Is 16821 a PO Box ZIP code?

16821 is a standard ZIP code. A normal ZIP code with street delivery.

Download or cite

Cite this page

zipcodes.pro. “16821 ZIP Code — Allport, Pennsylvania (Clearfield County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/16821

Machine-readable version of these facts:

curl https://zipcodes.pro/zip/16821.json

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