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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/01521

01521

ZIP 01521 is Holland, Massachusetts, in Hampden County; Eastern time.

Type
Standard
Time zone
America/New_York
County
Hampden
Metro area
Springfield, MA
Population
2,583
Coordinates
42.0468, -72.1802
☼ Live from 01521 — Holland, MA

Weather right now

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Where 01521 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 01521
  • 🔢 Type 01521 into a pocket calculator and turn it upside down: IZSIO — not quite a word, sorry.
  • ➕ As a number, 1,521 = 3 × 3 × 13 × 13. Its digits add up to 9, a total 375 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 10111110001
  • 🏠 Its numerical neighbours: 01520 (Holden, MA, 26 mi away) and 01522 (Jefferson, MA, 28 mi away).
  • 🔄 Backwards, 01521 becomes 12510 — and that is a real ZIP code: Billings, NY, 85 miles away.
  • 👥 37 other ZIP codes are made of exactly the same digits (01152, 02115, 02151, 10125, 10152, 10512, …). The farthest-flung twin is 51102 in Sioux City, IA, 1,231 miles away.
  • 🧭 Farther north than 76% of all ZIP codes, and farther east than 94%.
  • 🎯1,381 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 01521 and you would come out at 42.05°S, 107.82°E — 826 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 15h 15m of daylight. Shortest: 9h 06m.
  • 📏 At 12.3 square miles of land, 01521 is bigger than 30% of ZIP codes — room for about 9.3 Central Parks.
🌙 The sky over 01521 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population2,583This ZIP2,583
Households1,187This ZIP1,187
Housing units1,536This ZIP1,536
Median age51.9This ZIP51.9Massachusetts40.0US 38.9
Median household income$91,979This ZIP$91,979Massachusetts$103,960US $80,734
Median home value$333,600This ZIP$333,600Massachusetts$562,100US $332,700
Median gross rent$1,750This ZIP$1,750Massachusetts$1,762US $1,413
Bachelor's degree or higher35.3%This ZIP35.3%
Mean commute36.2 minThis ZIP36.2 min
Population density210.3 / sq miThis ZIP210.3 / sq mi

Business and tax activity

Business establishments31This ZIP31
Employees118This ZIP118
Annual payroll$5,007,000This ZIP$5,007,000
Tax returns filed1,320This ZIP1,320
Total adjusted gross income$107,312,000This ZIP$107,312,000

Land area

Land area12.28 sq miThis ZIP12.28 sq mi
Water area0.77 sq miThis ZIP0.77 sq mi

Other place names in 01521

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

ZIP codes near 01521

ZIPCityDistance
01081 Wales, MA 3.0 mi
01518 Fiskdale, MA 5.5 mi
06077 Staffordville, CT 5.5 mi
01010 Brimfield, MA 5.8 mi
06076 Stafford Springs, CT 6.1 mi
01566 Sturbridge, MA 6.5 mi
06075 Stafford, CT 7.0 mi
01550 Southbridge, MA 7.6 mi
01057 Monson, MA 7.9 mi
06282 Woodstock Valley, CT 8.4 mi

Find every ZIP code within 10 miles of 01521 →

Questions about this ZIP code

Where is ZIP code 01521?

01521 is in Holland, Massachusetts, in Hampden County, part of the Springfield, MA metropolitan area. Its published point location is 42.0468, -72.1802.

What county is 01521 in?

01521 lies in Hampden County.

What time zone is 01521 in?

01521 uses America/New_York.

How many people live in 01521?

About 2,583 people live in ZIP code 01521, in 1,187 households, at 210.3 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 01521?

$91,979 a year, against $103,960 across Massachusetts.

What ZIP codes are near 01521?

The closest are 01081 (3 mi), 01518 (5.5 mi), 06077 (5.5 mi), 01010 (5.8 mi) and 06076 (6.1 mi).

Is 01521 a PO Box ZIP code?

01521 is a standard ZIP code. A normal ZIP code with street delivery.

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Cite this page

zipcodes.pro. “01521 ZIP Code — Holland, Massachusetts (Hampden County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/01521

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