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/21034

21034

ZIP 21034 is Darlington, Maryland, in Harford County; area codes 667, 443 and 410; Eastern time.

Type
Standard
Time zone
America/New_York
County
Harford
Population
2,846
Coordinates
39.6406, -76.2231
☼ Live from 21034 — Darlington, MD

Weather right now

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Local time: —

Where 21034 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 21034
  • 🔢 Type 21034 into a pocket calculator and turn it upside down: hEOIZ — not quite a word, sorry.
  • ➕ As a number, 21,034 = 2 × 13 × 809. Its digits add up to 10, a total 513 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 101001000101010
  • 🏠 Its numerical neighbours: 21032 (Crownsville, MD, 47 mi away) and 21035 (Davidsonville, MD, 53 mi away).
  • 🔄 Backwards, 21034 becomes 43012, which is not a ZIP code at all.
  • 👥 68 other ZIP codes are made of exactly the same digits (01243, 01342, 01432, 02134, 02143, 02341, …). The farthest-flung twin is 34021 in APO AA, a military post office, 1,997 miles away.
  • 🧭 Farther north than 53% of all ZIP codes, and farther east than 84%.
  • 🎯1,185 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 21034 and you would come out at 39.64°S, 103.78°E — 859 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 59m of daylight. Shortest: 9h 22m.
  • 📏 At 26.7 square miles of land, 21034 is bigger than 43% of ZIP codes — room for about 20 Central Parks.
🌙 The sky over 21034 today
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🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population2,846This ZIP2,846
Households1,132This ZIP1,132
Housing units1,151This ZIP1,151
Median age45.1This ZIP45.1Maryland39.4US 38.9
Median household income$78,047This ZIP$78,047Maryland$103,678US $80,734
Median home value$401,500This ZIP$401,500Maryland$419,900US $332,700
Median gross rent$1,151This ZIP$1,151Maryland$1,705US $1,413
Bachelor's degree or higher22.8%This ZIP22.8%
Mean commute30.9 minThis ZIP30.9 min
Population density106.7 / sq miThis ZIP106.7 / sq mi

Business and tax activity

Business establishments80This ZIP80
Employees611This ZIP611
Annual payroll$37,755,000This ZIP$37,755,000
Tax returns filed1,650This ZIP1,650
Total adjusted gross income$155,403,000This ZIP$155,403,000

Land area

Land area26.67 sq miThis ZIP26.67 sq mi
Water area2.83 sq miThis ZIP2.83 sq mi

Other place names in 21034

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

ZIP codes near 21034

ZIPCityDistance
21918 Conowingo, MD 3.6 mi
21028 Churchville, MD 5.3 mi
21160 Whiteford, MD 6.1 mi
21917 Colora, MD 7.0 mi
21078 Havre De Grace, MD 7.1 mi
21154 Street, MD 7.4 mi
21015 Bel Air, MD 7.6 mi
21904 Port Deposit, MD 8.4 mi
17563 Peach Bottom, PA 8.5 mi
17314 Delta, PA 9.3 mi

Find every ZIP code within 10 miles of 21034 →

Questions about this ZIP code

Where is ZIP code 21034?

21034 is in Darlington, Maryland, in Harford County, part of the Baltimore-Columbia-Towson, MD metropolitan area. Its published point location is 39.6406, -76.2231.

What county is 21034 in?

21034 lies in Harford County.

What area code is 21034?

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

What time zone is 21034 in?

21034 uses America/New_York.

How many people live in 21034?

About 2,846 people live in ZIP code 21034, in 1,132 households, at 106.7 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 21034?

$78,047 a year, against $103,678 across Maryland.

What ZIP codes are near 21034?

The closest are 21918 (3.6 mi), 21028 (5.3 mi), 21160 (6.1 mi), 21917 (7 mi) and 21078 (7.1 mi).

Is 21034 a PO Box ZIP code?

21034 is a standard ZIP code. A normal ZIP code with street delivery.

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Cite this page

zipcodes.pro. “21034 ZIP Code — Darlington, Maryland (Harford County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/21034

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