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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/18351

18351

ZIP 18351 is Portland, Pennsylvania, in Northampton County; area code 570; Eastern time.

Type
Standard
Time zone
America/New_York
County
Northampton
Population
546
Coordinates
40.9231, -75.0999
☼ Live from 18351 — Portland, PA

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Local time: —

Where 18351 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 18351
  • 🔢 Type 18351 into a pocket calculator and turn it upside down: ISEBI — not quite a word, sorry.
  • ➕ As a number, 18,351 = 3 × 3 × 2039. Its digits add up to 18, a total 2,332 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 100011110101111
  • 🏠 Its numerical neighbours: 18350 (Pocono Pines, PA, 23 mi away) and 18352 (Reeders, PA, 14 mi away).
  • 🔄 Backwards, 18351 becomes 15381, which is not a ZIP code at all.
  • 👥 22 other ZIP codes are made of exactly the same digits (11358, 11385, 11853, 13158, 13815, 13851, …). The farthest-flung twin is 85311 in Glendale, AZ, 2,086 miles away.
  • 🧭 Farther north than 66% of all ZIP codes, and farther east than 87%.
  • 🎯1,234 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 18351 and you would come out at 40.92°S, 104.90°E — 868 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 15h 07m of daylight. Shortest: 9h 14m.
  • 📏 At 0.331 square miles of land, 18351 is bigger than 4% of ZIP codes — about 160 football fields.
🌙 The sky over 18351 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population546This ZIP546
Households235This ZIP235
Housing units289This ZIP289
Median age46.4This ZIP46.4Pennsylvania40.9US 38.9
Median household income$52,679This ZIP$52,679Pennsylvania$77,971US $80,734
Median home value$266,900This ZIP$266,900Pennsylvania$254,500US $332,700
Median gross rent$1,217This ZIP$1,217Pennsylvania$1,209US $1,413
Bachelor's degree or higher18.8%This ZIP18.8%
Mean commute35.0 minThis ZIP35.0 min
Population density1,649.5 / sq miThis ZIP1,649.5 / sq mi

Business and tax activity

Business establishments16This ZIP16
Employees217This ZIP217
Annual payroll$11,308,000This ZIP$11,308,000

Land area

Land area0.33 sq miThis ZIP0.33 sq mi
Water area0.05 sq miThis ZIP0.05 sq mi

Other place names in 18351

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

ZIP codes near 18351

ZIPCityDistance
07832 Columbia, NJ 2.3 mi
18343 Mount Bethel, PA 2.3 mi
07833 Delaware, NJ 2.6 mi
18327 Delaware Water Gap, PA 4.8 mi
18341 Minisink Hills, PA 5.7 mi
18013 Bangor, PA 5.9 mi
18356 Shawnee On Delaware, PA 6.4 mi
07844 Hope, NJ 6.9 mi
07823 Belvidere, NJ 7.5 mi
07829 Buttzville, NJ 8.1 mi

Find every ZIP code within 10 miles of 18351 →

Questions about this ZIP code

Where is ZIP code 18351?

18351 is in Portland, Pennsylvania, in Northampton County, part of the Allentown-Bethlehem-Easton, PA-NJ metropolitan area. Its published point location is 40.9231, -75.0999.

What county is 18351 in?

18351 lies in Northampton County.

What area code is 18351?

Portland uses area code 570, from NANPA's telephone records.

What time zone is 18351 in?

18351 uses America/New_York.

How many people live in 18351?

About 546 people live in ZIP code 18351, in 235 households, at 1,649.5 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 18351?

$52,679 a year, against $77,971 across Pennsylvania.

What ZIP codes are near 18351?

The closest are 07832 (2.3 mi), 18343 (2.3 mi), 07833 (2.6 mi), 18327 (4.8 mi) and 18341 (5.7 mi).

Is 18351 a PO Box ZIP code?

18351 is a standard ZIP code. A normal ZIP code with street delivery.

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Cite this page

zipcodes.pro. “18351 ZIP Code — Portland, Pennsylvania (Northampton County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/18351

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