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/21102

21102

ZIP 21102 is Manchester, Maryland, mostly in Carroll County; area codes 443, 667 and 410; Eastern time.

Type
Standard
Time zone
America/New_York
County
Carroll +1 more
Population
12,162
Coordinates
39.6922, -76.8476
☼ Live from 21102 — Manchester, MD

Weather right now

Asking the National Weather Service…

NEXRAD radar
Finding the nearest radar…
Local time: —

Where 21102 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 21102
  • 🔢 Type 21102 into a pocket calculator and turn it upside down: ZOIIZ — not quite a word, sorry.
  • ➕ As a number, 21,102 = 2 × 3 × 3517. Its digits add up to 6, a total 90 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 101001001101110
  • 🏠 Its numerical neighbours: 21094 (Lutherville Timonium, MD, 22 mi away) and 21104 (Marriottsville, MD, 24 mi away).
  • 🔄 Backwards, 21102 becomes 20112 — and that is a real ZIP code: Manassas, VA, 77 miles away.
  • 👥 19 other ZIP codes are made of exactly the same digits (02112, 02121, 02211, 10122, 10212, 11022, …). The farthest-flung twin is 02112 in Boston, MA, 353 miles away.
  • 🧭 Farther north than 54% of all ZIP codes, and farther east than 82%.
  • 🎯1,151 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 21102 and you would come out at 39.69°S, 103.15°E — 889 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 59m of daylight. Shortest: 9h 21m.
  • 📏 At 40.6 square miles of land, 21102 is bigger than 54% of ZIP codes — room for about 31 Central Parks.
🌙 The sky over 21102 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population12,162This ZIP12,162
Households4,413This ZIP4,413
Housing units4,511This ZIP4,511
Median age44.5This ZIP44.5Maryland39.4US 38.9
Median household income$135,069This ZIP$135,069Maryland$103,678US $80,734
Median home value$392,800This ZIP$392,800Maryland$419,900US $332,700
Median gross rent$1,484This ZIP$1,484Maryland$1,705US $1,413
Bachelor's degree or higher34.7%This ZIP34.7%
Mean commute35.4 minThis ZIP35.4 min
Population density299.3 / sq miThis ZIP299.3 / sq mi

Business and tax activity

Business establishments229This ZIP229
Employees1,297This ZIP1,297
Annual payroll$57,543,000This ZIP$57,543,000
Tax returns filed5,970This ZIP5,970
Total adjusted gross income$537,469,000This ZIP$537,469,000

Land area

Land area40.64 sq miThis ZIP40.64 sq mi
Water area0.64 sq miThis ZIP0.64 sq mi

Counties 21102 spans

A ZIP code is a mail route and ignores county lines. Shares are by overlapping land area.

CountyShare of this ZIP
Carroll County 76.7%
Baltimore County 23.3%

Other place names in 21102

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

ZIP codes near 21102

ZIPCityDistance
21088 Lineboro, MD 1.8 mi
17329 Glenville, PA 4.6 mi
21074 Hampstead, MD 4.9 mi
21053 Freeland, MD 7.1 mi
17327 Glen Rock, PA 7.8 mi
21155 Upperco, MD 8.5 mi
17311 Codorus, PA 8.6 mi
17355 Railroad, PA 9.3 mi
17354 Porters Sideling, PA 9.6 mi
21120 Parkton, MD 9.7 mi

Find every ZIP code within 10 miles of 21102 →

Questions about this ZIP code

Where is ZIP code 21102?

21102 is in Manchester, Maryland, in Carroll County, part of the Baltimore-Columbia-Towson, MD metropolitan area. Its published point location is 39.6922, -76.8476.

What county is 21102 in?

21102 spans 2 counties: Carroll County and Baltimore County. Most of it falls in Carroll County, measured by overlapping land area — the county holding the most land in a ZIP code is not always the one holding the most residents.

What area code is 21102?

Manchester uses area codes 443, 667 and 410, from NANPA's telephone records.

What time zone is 21102 in?

21102 uses America/New_York.

How many people live in 21102?

About 12,162 people live in ZIP code 21102, in 4,413 households, at 299.3 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 21102?

$135,069 a year, against $103,678 across Maryland.

What ZIP codes are near 21102?

The closest are 21088 (1.8 mi), 17329 (4.6 mi), 21074 (4.9 mi), 21053 (7.1 mi) and 17327 (7.8 mi).

Is 21102 a PO Box ZIP code?

21102 is a standard ZIP code. A normal ZIP code with street delivery.

Download or cite

Cite this page

zipcodes.pro. “21102 ZIP Code — Manchester, Maryland (Carroll County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/21102

Machine-readable version of these facts:

curl https://zipcodes.pro/zip/21102.json

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