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Where 21787 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.
- 🔢 Type 21787 into a pocket calculator and turn it upside down: LBLIZ — not quite a word, sorry.
- ➕ 21787 is a prime number. It cannot be divided by anything except 1 and itself. Its digits add up to 25, a total 2,242 other ZIP codes share.
- 💾In binary, the way a computer stores it:
101010100011011 - 🏠 Its numerical neighbours: 21784 (Sykesville, MD, 22 mi away) and 21788 (Thurmont, MD, 14 mi away).
- 🔄 Backwards, 21787 becomes 78712 — and that is a real ZIP code: Austin, TX, 1,328 miles away.
- 👥 20 other ZIP codes are made of exactly the same digits (12778, 12787, 17728, 17827, 17872, 21778, …). The farthest-flung twin is 87712 in Buena Vista, NM, 1,545 miles away.
- 🧭 Farther north than 53% of all ZIP codes, and farther east than 81%.
- 🎯1,134 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
- 🌏 Dig straight through the Earth from 21787 and you would come out at 39.68°S, 102.83°E — 903 miles from Perth, Australia, the nearest big city to that spot.
- ☀Longest day of the year: 14h 59m of daylight. Shortest: 9h 21m.
- 📏 At 61.1 square miles of land, 21787 is bigger than 65% of ZIP codes — room for about 46 Central Parks.
- Working out the sun…
- Checking the USGS…
Source: USGS.
People and housing
| Population | 11,645This ZIP11,645 |
|---|---|
| Households | 4,431This ZIP4,431 |
| Housing units | 4,632This ZIP4,632 |
| Median age | 40.1This ZIP40.1Maryland39.4US 38.9 |
| Median household income | $91,682This ZIP$91,682Maryland$103,678US $80,734 |
| Median home value | $355,000This ZIP$355,000Maryland$419,900US $332,700 |
| Median gross rent | $1,061This ZIP$1,061Maryland$1,705US $1,413 |
| Bachelor's degree or higher | 22.2%This ZIP22.2% |
| Mean commute | 34.9 minThis ZIP34.9 min |
| Population density | 190.7 / sq miThis ZIP190.7 / sq mi |
Business and tax activity
| Business establishments | 193This ZIP193 |
|---|---|
| Employees | 2,370This ZIP2,370 |
| Annual payroll | $142,967,000This ZIP$142,967,000 |
| Tax returns filed | 5,900This ZIP5,900 |
| Total adjusted gross income | $439,978,000This ZIP$439,978,000 |
Land area
| Land area | 61.08 sq miThis ZIP61.08 sq mi |
|---|---|
| Water area | 0.23 sq miThis ZIP0.23 sq mi |
Counties 21787 spans
A ZIP code is a mail route and ignores county lines. Shares are by overlapping land area.
| County | Share of this ZIP |
|---|---|
| Carroll County | 87.0% |
| Frederick County | 13.0% |
Other place names in 21787
Census places whose land this ZIP code overlaps. The Postal Service may accept other city names in an address, too.
ZIP codes near 21787
| ZIP | City | Distance |
|---|---|---|
17340 | Littlestown, PA | 6.1 mi |
21757 | Keymar, MD | 7.4 mi |
21158 | Westminster, MD | 7.5 mi |
21727 | Emmitsburg, MD | 8.4 mi |
21778 | Rocky Ridge, MD | 9.3 mi |
21759 | Ladiesburg, MD | 9.8 mi |
21791 | Union Bridge, MD | 10.0 mi |
21775 | New Midway, MD | 10.2 mi |
17325 | Gettysburg, PA | 10.7 mi |
21798 | Woodsboro, MD | 11.7 mi |
Find every ZIP code within 10 miles of 21787 →
Questions about this ZIP code
Where is ZIP code 21787?
21787 is in Taneytown, Maryland, in Carroll County, part of the Baltimore-Columbia-Towson, MD metropolitan area. Its published point location is 39.6776, -77.1726.
What county is 21787 in?
21787 spans 2 counties: Carroll County and Frederick County. Most of it falls in Carroll County, measured by overlapping land area — the county holding the most land in a ZIP code is not always the one holding the most residents.
What area code is 21787?
Taneytown uses area codes 443, 410 and 667, from NANPA's telephone records.
What time zone is 21787 in?
21787 uses America/New_York.
How many people live in 21787?
About 11,645 people live in ZIP code 21787, in 4,431 households, at 190.7 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 21787?
$91,682 a year, against $103,678 across Maryland.
What ZIP codes are near 21787?
The closest are 17340 (6.1 mi), 21757 (7.4 mi), 21158 (7.5 mi), 21727 (8.4 mi) and 21778 (9.3 mi).
Is 21787 a PO Box ZIP code?
21787 is a standard ZIP code. A normal ZIP code with street delivery.
Download or cite
Cite this page
zipcodes.pro. “21787 ZIP Code — Taneytown, Maryland (Carroll County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/21787
Machine-readable version of these facts:
curl https://zipcodes.pro/zip/21787.jsonUnderlying data is public domain or openly licensed — sources, vintages and licences.