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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/21030

21030

ZIP 21030 is Cockeysville, Maryland, in Baltimore County; area codes 410, 443 and 667; Eastern time.

Type
Standard
Time zone
America/New_York
County
Baltimore
Population
25,827
Coordinates
39.5158, -76.6988
☼ Live from 21030 — Cockeysville, MD

Weather right now

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NEXRAD radar
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Local time: —

Where 21030 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 21030
  • 🔢 Type 21030 into a pocket calculator and turn it upside down: OEOIZ — not quite a word, sorry.
  • ➕ As a number, 21,030 = 2 × 3 × 5 × 701. Its digits add up to 6, a total 90 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 101001000100110
  • 🏠 Its numerical neighbours: 21029 (Clarksville, MD, 25 mi away) and 21031 (Hunt Valley, MD, 3 mi away).
  • 🔄 Backwards, 21030 becomes 03012, which is not a ZIP code at all.
  • 👥 24 other ZIP codes are made of exactly the same digits (01032, 01203, 01230, 01302, 02130, 02301, …). The farthest-flung twin is 31020 in Dry Branch, GA, 607 miles away.
  • 🧭 Farther north than 52% of all ZIP codes, and farther east than 83%.
  • 🎯1,161 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 21030 and you would come out at 39.52°S, 103.30°E — 876 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 58m of daylight. Shortest: 9h 22m.
  • 📏 At 24.1 square miles of land, 21030 is bigger than 41% of ZIP codes — room for about 18 Central Parks.
🌙 The sky over 21030 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population25,827This ZIP25,827
Households10,900This ZIP10,900
Housing units11,421This ZIP11,421
Median age36.8This ZIP36.8Maryland39.4US 38.9
Median household income$89,015This ZIP$89,015Maryland$103,678US $80,734
Median home value$450,700This ZIP$450,700Maryland$419,900US $332,700
Median gross rent$1,647This ZIP$1,647Maryland$1,705US $1,413
Bachelor's degree or higher51.8%This ZIP51.8%
Mean commute24.3 minThis ZIP24.3 min
Population density1,073.9 / sq miThis ZIP1,073.9 / sq mi

Business and tax activity

Business establishments995This ZIP995
Employees24,506This ZIP24,506
Annual payroll$1,994,197,000This ZIP$1,994,197,000
Tax returns filed13,300This ZIP13,300
Total adjusted gross income$2,158,972,000This ZIP$2,158,972,000

Land area

Land area24.05 sq miThis ZIP24.05 sq mi
Water area0.48 sq miThis ZIP0.48 sq mi

Other place names in 21030

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

ZIP codes near 21030

ZIPCityDistance
21023 Butler, MD 2.3 mi
21152 Sparks Glencoe, MD 2.8 mi
21031 Hunt Valley, MD 2.9 mi
21065 Hunt Valley, MD 3.1 mi
21020 Boring, MD 5.7 mi
21131 Phoenix, MD 5.9 mi
21093 Lutherville Timonium, MD 6.2 mi
21071 Glyndon, MD 6.3 mi
21153 Stevenson, MD 6.8 mi
21155 Upperco, MD 7.0 mi

Find every ZIP code within 10 miles of 21030 →

Questions about this ZIP code

Where is ZIP code 21030?

21030 is in Cockeysville, Maryland, in Baltimore County, part of the Baltimore-Columbia-Towson, MD metropolitan area. Its published point location is 39.5158, -76.6988.

What county is 21030 in?

21030 lies in Baltimore County.

What area code is 21030?

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

What time zone is 21030 in?

21030 uses America/New_York.

How many people live in 21030?

About 25,827 people live in ZIP code 21030, in 10,900 households, at 1,073.9 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 21030?

$89,015 a year, against $103,678 across Maryland.

What ZIP codes are near 21030?

The closest are 21023 (2.3 mi), 21152 (2.8 mi), 21031 (2.9 mi), 21065 (3.1 mi) and 21020 (5.7 mi).

Is 21030 a PO Box ZIP code?

21030 is a standard ZIP code. A normal ZIP code with street delivery.

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Cite this page

zipcodes.pro. “21030 ZIP Code — Cockeysville, Maryland (Baltimore County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/21030

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