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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/02121

02121

ZIP 02121 is in Dorchester, Massachusetts, in Suffolk County; area codes 617 and 857; Eastern time. Dorchester has 3 ZIP codes; the others are 02122 and 02125.

Type
Standard
Time zone
America/New_York
County
Suffolk
Population
29,040
Coordinates
42.3054, -71.0870
☼ Live from 02121 — Dorchester, MA

Weather right now

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Local time: —

Where 02121 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 02121
  • 🔢 Type 02121 into a pocket calculator and turn it upside down: IZIZO — not quite a word, sorry.
  • ➕ As a number, 2,121 = 3 × 7 × 101. Its digits add up to 6, a total 90 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 100001001001
  • 🏠 Its numerical neighbours: 02120 (Roxbury Crossing, MA, 2 mi away) and 02122 (Dorchester, MA, 2 mi away).
  • 🔄 Backwards, 02121 becomes 12120 — and that is a real ZIP code: Medusa, NY, 156 miles away.
  • 👥 19 other ZIP codes are made of exactly the same digits (02112, 02211, 10122, 10212, 11022, 11202, …). The farthest-flung twin is 20112 in Manassas, VA, 417 miles away.
  • 🧭 Farther north than 78% of all ZIP codes, and farther east than 96%.
  • 🎯1,436 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 02121 and you would come out at 42.31°S, 108.91°E — 811 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 15h 17m of daylight. Shortest: 9h 05m.
  • 📏 At 1.9 square miles of land, 02121 is bigger than 11% of ZIP codes — room for about 1.4 Central Parks.
🌙 The sky over 02121 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population29,040This ZIP29,040
Households10,760This ZIP10,760
Housing units11,429This ZIP11,429
Median age34.3This ZIP34.3Massachusetts40.0US 38.9
Median household income$43,136This ZIP$43,136Massachusetts$103,960US $80,734
Median home value$590,200This ZIP$590,200Massachusetts$562,100US $332,700
Median gross rent$1,325This ZIP$1,325Massachusetts$1,762US $1,413
Bachelor's degree or higher19.9%This ZIP19.9%
Mean commute36.5 minThis ZIP36.5 min
Population density15,397.7 / sq miThis ZIP15,397.7 / sq mi

Business and tax activity

Business establishments275This ZIP275
Employees2,317This ZIP2,317
Annual payroll$112,539,000This ZIP$112,539,000
Tax returns filed13,050This ZIP13,050
Total adjusted gross income$567,663,000This ZIP$567,663,000

Land area

Land area1.89 sq miThis ZIP1.89 sq mi
Water area0.01 sq miThis ZIP0.01 sq mi

Other place names in 02121

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

ZIP codes near 02121

ZIPCityDistance
02119 Roxbury, MA 1.3 mi
02130 Jamaica Plain, MA 1.4 mi
02124 Dorchester Center, MA 1.5 mi
02125 Dorchester, MA 1.8 mi
02122 Dorchester, MA 1.9 mi
02120 Roxbury Crossing, MA 1.9 mi
02126 Mattapan, MA 1.9 mi
02115 Boston, MA 2.4 mi
02118 Boston, MA 2.4 mi
02447 Brookline Village, MA 2.4 mi

Find every ZIP code within 10 miles of 02121 →

Questions about this ZIP code

Where is ZIP code 02121?

02121 is in Dorchester, Massachusetts, in Suffolk County, part of the Boston-Cambridge-Newton, MA-NH metropolitan area. Its published point location is 42.3054, -71.0870.

What county is 02121 in?

02121 lies in Suffolk County.

What area code is 02121?

Dorchester uses area codes 617 and 857, from NANPA's telephone records.

What time zone is 02121 in?

02121 uses America/New_York.

How many people live in 02121?

About 29,040 people live in ZIP code 02121, in 10,760 households, at 15,397.7 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 02121?

$43,136 a year, against $103,960 across Massachusetts.

What ZIP codes are near 02121?

The closest are 02119 (1.3 mi), 02130 (1.4 mi), 02124 (1.5 mi), 02125 (1.8 mi) and 02122 (1.9 mi).

Is 02121 a PO Box ZIP code?

02121 is a standard ZIP code. A normal ZIP code with street delivery.

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Cite this page

zipcodes.pro. “02121 ZIP Code — Dorchester, Massachusetts (Suffolk County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/02121

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