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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/21028

21028

ZIP 21028 is Churchville, Maryland, in Harford County; area codes 443, 667 and 410; Eastern time.

Type
Standard
Time zone
America/New_York
County
Harford
Population
3,103
Coordinates
39.5660, -76.2495
☼ Live from 21028 — Churchville, MD

Weather right now

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Local time: —

Where 21028 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 21028
  • 🔢 Type 21028 into a pocket calculator and turn it upside down: BZOIZ — not quite a word, sorry.
  • ➕ As a number, 21,028 = 2 × 2 × 7 × 751. Its digits add up to 13, a total 1,179 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 101001000100100
  • 🏠 Its numerical neighbours: 21027 (Chase, MD, 15 mi away) and 21029 (Clarksville, MD, 45 mi away).
  • 🔄 Backwards, 21028 becomes 82012, which is not a ZIP code at all.
  • 👥 38 other ZIP codes are made of exactly the same digits (01822, 02128, 02812, 08212, 08221, 10282, …). The farthest-flung twin is 81220 in Cimarron, CO, 1,672 miles away.
  • 🧭 Farther north than 53% of all ZIP codes, and farther east than 84%.
  • 🎯1,184 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 21028 and you would come out at 39.57°S, 103.75°E — 858 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 58m of daylight. Shortest: 9h 22m.
  • 📏 At 12.9 square miles of land, 21028 is bigger than 31% of ZIP codes — room for about 9.8 Central Parks.
🌙 The sky over 21028 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population3,103This ZIP3,103
Households1,066This ZIP1,066
Housing units1,134This ZIP1,134
Median age44.6This ZIP44.6Maryland39.4US 38.9
Median household income$137,586This ZIP$137,586Maryland$103,678US $80,734
Median home value$512,400This ZIP$512,400Maryland$419,900US $332,700
Median gross rent$2,080This ZIP$2,080Maryland$1,705US $1,413
Bachelor's degree or higher49.6%This ZIP49.6%
Mean commute31.0 minThis ZIP31.0 min
Population density241.2 / sq miThis ZIP241.2 / sq mi

Business and tax activity

Business establishments74This ZIP74
Employees629This ZIP629
Annual payroll$45,444,000This ZIP$45,444,000
Tax returns filed1,640This ZIP1,640
Total adjusted gross income$232,269,000This ZIP$232,269,000

Land area

Land area12.86 sq miThis ZIP12.86 sq mi
Water area0.05 sq miThis ZIP0.05 sq mi

ZIP codes near 21028

ZIPCityDistance
21015 Bel Air, MD 2.7 mi
21001 Aberdeen, MD 5.0 mi
21034 Darlington, MD 5.3 mi
21078 Havre De Grace, MD 5.8 mi
21014 Bel Air, MD 5.8 mi
21017 Belcamp, MD 6.3 mi
21009 Abingdon, MD 6.8 mi
21130 Perryman, MD 7.1 mi
21050 Forest Hill, MD 7.7 mi
21018 Benson, MD 8.2 mi

Find every ZIP code within 10 miles of 21028 →

Questions about this ZIP code

Where is ZIP code 21028?

21028 is in Churchville, Maryland, in Harford County, part of the Baltimore-Columbia-Towson, MD metropolitan area. Its published point location is 39.5660, -76.2495.

What county is 21028 in?

21028 lies in Harford County.

What area code is 21028?

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

What time zone is 21028 in?

21028 uses America/New_York.

How many people live in 21028?

About 3,103 people live in ZIP code 21028, in 1,066 households, at 241.2 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 21028?

$137,586 a year, against $103,678 across Maryland.

What ZIP codes are near 21028?

The closest are 21015 (2.7 mi), 21001 (5 mi), 21034 (5.3 mi), 21078 (5.8 mi) and 21014 (5.8 mi).

Is 21028 a PO Box ZIP code?

21028 is a standard ZIP code. A normal ZIP code with street delivery.

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Cite this page

zipcodes.pro. “21028 ZIP Code — Churchville, Maryland (Harford County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/21028

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