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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/21917

21917

ZIP 21917 is Colora, Maryland, in Cecil County; area codes 410 and 667; Eastern time.

Type
Standard
Time zone
America/New_York
County
Cecil
Population
2,233
Coordinates
39.6716, -76.0974
☼ Live from 21917 — Colora, MD

Weather right now

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Local time: —

Where 21917 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 21917
  • 🔢 Type 21917 into a pocket calculator and turn it upside down: LIGIZ — not quite a word, sorry.
  • ➕ As a number, 21,917 = 7 × 31 × 101. Its digits add up to 20, a total 2,586 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 101010110011101
  • 🏠 Its numerical neighbours: 21916 (Childs, MD, 12 mi away) and 21918 (Conowingo, MD, 4 mi away).
  • 🔄 Backwards, 21917 becomes 71912, which is not a ZIP code at all.
  • 👥 30 other ZIP codes are made of exactly the same digits (11729, 11792, 11972, 12197, 12719, 12791, …). The farthest-flung twin is 97112 in Cloverdale, OR, 2,429 miles away.
  • 🧭 Farther north than 53% of all ZIP codes, and farther east than 85%.
  • 🎯1,191 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 21917 and you would come out at 39.67°S, 103.90°E — 855 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 59m of daylight. Shortest: 9h 21m.
  • 📏 At 7.8 square miles of land, 21917 is bigger than 24% of ZIP codes — room for about 5.9 Central Parks.
🌙 The sky over 21917 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population2,233This ZIP2,233
Households818This ZIP818
Housing units818This ZIP818
Median age42.4This ZIP42.4Maryland39.4US 38.9
Median household income$96,750This ZIP$96,750Maryland$103,678US $80,734
Median home value$409,400This ZIP$409,400Maryland$419,900US $332,700
Bachelor's degree or higher12.1%This ZIP12.1%
Mean commute37.7 minThis ZIP37.7 min
Population density285.5 / sq miThis ZIP285.5 / sq mi

Business and tax activity

Business establishments24This ZIP24
Employees189This ZIP189
Annual payroll$7,860,000This ZIP$7,860,000
Tax returns filed1,270This ZIP1,270
Total adjusted gross income$97,994,000This ZIP$97,994,000

Land area

Land area7.82 sq miThis ZIP7.82 sq mi
Water area0.05 sq miThis ZIP0.05 sq mi

ZIP codes near 21917

ZIPCityDistance
21911 Rising Sun, MD 3.8 mi
21904 Port Deposit, MD 4.2 mi
21918 Conowingo, MD 4.2 mi
19362 Nottingham, PA 5.7 mi
21034 Darlington, MD 7.0 mi
21903 Perryville, MD 7.3 mi
17563 Peach Bottom, PA 8.0 mi
21078 Havre De Grace, MD 8.1 mi
21902 Perry Point, MD 8.4 mi
21914 Charlestown, MD 9.0 mi

Find every ZIP code within 10 miles of 21917 →

Questions about this ZIP code

Where is ZIP code 21917?

21917 is in Colora, Maryland, in Cecil County, part of the Philadelphia-Camden-Wilmington, PA-NJ-DE-MD metropolitan area. Its published point location is 39.6716, -76.0974.

What county is 21917 in?

21917 lies in Cecil County.

What area code is 21917?

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

What time zone is 21917 in?

21917 uses America/New_York.

How many people live in 21917?

About 2,233 people live in ZIP code 21917, in 818 households, at 285.5 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 21917?

$96,750 a year, against $103,678 across Maryland.

What ZIP codes are near 21917?

The closest are 21911 (3.8 mi), 21904 (4.2 mi), 21918 (4.2 mi), 19362 (5.7 mi) and 21034 (7 mi).

Is 21917 a PO Box ZIP code?

21917 is a standard ZIP code. A normal ZIP code with street delivery.

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Cite this page

zipcodes.pro. “21917 ZIP Code — Colora, Maryland (Cecil County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/21917

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