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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/21029

21029

ZIP 21029 is Clarksville, Maryland, in Howard County; area codes 410, 443 and 667; Eastern time.

Type
Standard
Time zone
America/New_York
County
Howard
Population
13,607
Coordinates
39.2136, -76.9594
☼ Live from 21029 — Clarksville, MD

Weather right now

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NEXRAD radar
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Local time: —

Where 21029 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 21029
  • 🔢 Type 21029 into a pocket calculator and turn it upside down: GZOIZ — not quite a word, sorry.
  • ➕ As a number, 21,029 = 17 × 1237. Its digits add up to 14, a total 1,416 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 101001000100101
  • 🏠 Its numerical neighbours: 21028 (Churchville, MD, 45 mi away) and 21030 (Cockeysville, MD, 25 mi away).
  • 🔄 Backwards, 21029 becomes 92012, which is not a ZIP code at all.
  • 👥 36 other ZIP codes are made of exactly the same digits (01229, 01922, 02129, 02912, 02921, 09212, …). The farthest-flung twin is 09212 in APO AE, a military post office, 4,043 miles away.
  • 🧭 Farther north than 50% of all ZIP codes, and farther east than 82%.
  • 🎯1,150 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 21029 and you would come out at 39.21°S, 103.04°E — 876 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 56m of daylight. Shortest: 9h 24m.
  • 📏 At 16.9 square miles of land, 21029 is bigger than 35% of ZIP codes — room for about 13 Central Parks.
🌙 The sky over 21029 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population13,607This ZIP13,607
Households4,056This ZIP4,056
Housing units4,124This ZIP4,124
Median age43.1This ZIP43.1Maryland39.4US 38.9
Median household income$243,542This ZIP$243,542Maryland$103,678US $80,734
Median home value$912,100This ZIP$912,100Maryland$419,900US $332,700
Median gross rent$3,500+This ZIP$3,500+Maryland$1,705US $1,413
Bachelor's degree or higher81.4%This ZIP81.4%
Mean commute32.4 minThis ZIP32.4 min
Population density804.3 / sq miThis ZIP804.3 / sq mi

Business and tax activity

Business establishments401This ZIP401
Employees3,928This ZIP3,928
Annual payroll$214,930,000This ZIP$214,930,000
Tax returns filed6,100This ZIP6,100
Total adjusted gross income$1,478,728,000This ZIP$1,478,728,000

Land area

Land area16.92 sq miThis ZIP16.92 sq mi
Water area0.33 sq miThis ZIP0.33 sq mi

Other place names in 21029

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

ZIP codes near 21029

ZIPCityDistance
21041 Ellicott City, MD 1.8 mi
21150 Simpsonville, MD 1.8 mi
20777 Highland, MD 2.7 mi
21036 Dayton, MD 2.9 mi
20862 Brinklow, MD 3.8 mi
21737 Glenelg, MD 4.3 mi
21044 Columbia, MD 4.4 mi
20759 Fulton, MD 4.4 mi
20861 Ashton, MD 5.0 mi
20833 Brookeville, MD 5.5 mi

Find every ZIP code within 10 miles of 21029 →

Questions about this ZIP code

Where is ZIP code 21029?

21029 is in Clarksville, Maryland, in Howard County, part of the Baltimore-Columbia-Towson, MD metropolitan area. Its published point location is 39.2136, -76.9594.

What county is 21029 in?

21029 lies in Howard County.

What area code is 21029?

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

What time zone is 21029 in?

21029 uses America/New_York.

How many people live in 21029?

About 13,607 people live in ZIP code 21029, in 4,056 households, at 804.3 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 21029?

$243,542 a year, against $103,678 across Maryland.

What ZIP codes are near 21029?

The closest are 21041 (1.8 mi), 21150 (1.8 mi), 20777 (2.7 mi), 21036 (2.9 mi) and 20862 (3.8 mi).

Is 21029 a PO Box ZIP code?

21029 is a standard ZIP code. A normal ZIP code with street delivery.

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Cite this page

zipcodes.pro. “21029 ZIP Code — Clarksville, Maryland (Howard County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/21029

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