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/21670

21670

ZIP 21670 is Templeville, Maryland, in Caroline County; area codes 667 and 410; Eastern time.

Type
No street area
Time zone
America/New_York
County
Caroline
Metro area
none
Coordinates
39.1362, -75.7660

The Census map gives this ZIP code no delivery area of its own, which usually means it serves post office boxes, a single organization or a post office rather than streets of homes.

This ZIP code has no Census tabulation area of its own. Its point falls inside ZCTA 21649, whose figures describe that area — not this ZIP code.

☼ Live from 21670 — Templeville, MD

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Where 21670 is

This ZIP code has no Census tabulation area, so there is no boundary to draw — the marker is its published point location.

★ Weird and wonderful facts about 21670
  • 🔢 Type 21670 into a pocket calculator and turn it upside down: OLgIZ — not quite a word, sorry.
  • ➕ As a number, 21,670 = 2 × 5 × 11 × 197. Its digits add up to 16, a total 1,922 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 101010010100110
  • 🏠 Its numerical neighbours: 21669 (Taylors Island, MD, 55 mi away) and 21671 (Tilghman, MD, 43 mi away).
  • 🔄 Backwards, 21670 becomes 07612, which is not a ZIP code at all.
  • 👥 62 other ZIP codes are made of exactly the same digits (01267, 02176, 02671, 02761, 06127, 06712, …). The farthest-flung twin is 76102 in Fort Worth, TX, 1,280 miles away.
  • 🧭 Farther north than 50% of all ZIP codes, and farther east than 85%.
  • 🎯1,214 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 21670 and you would come out at 39.14°S, 104.23°E — 820 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 55m of daylight. Shortest: 9h 25m.
🌙 The sky over 21670 today
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Source: USGS.

Land area

ZIP codes near 21670

ZIPCityDistance
21649 Marydel, MD 1.2 mi
19964 Marydel, DE 3.5 mi
19953 Hartly, DE 4.0 mi
21607 Barclay, MD 4.8 mi
21640 Henderson, MD 5.5 mi
21668 Sudlersville, MD 5.9 mi
21644 Ingleside, MD 6.0 mi
19934 Camden Wyoming, DE 8.2 mi
19955 Kenton, DE 8.3 mi
21636 Goldsboro, MD 8.5 mi

Find every ZIP code within 10 miles of 21670 →

Questions about this ZIP code

Where is ZIP code 21670?

21670 is in Templeville, Maryland, in Caroline County. Its published point location is 39.1362, -75.7660.

What county is 21670 in?

21670 lies in Caroline County.

What area code is 21670?

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

What time zone is 21670 in?

21670 uses America/New_York.

What ZIP codes are near 21670?

The closest are 21649 (1.2 mi), 19964 (3.5 mi), 19953 (4 mi), 21607 (4.8 mi) and 21640 (5.5 mi).

Is 21670 a PO Box ZIP code?

Possibly. The Census map gives this ZIP code no delivery area of its own, which usually means it serves post office boxes, a single organization or a post office rather than streets of homes.

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Cite this page

zipcodes.pro. “21670 ZIP Code — Templeville, Maryland (Caroline County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/21670

Machine-readable version of these facts:

curl https://zipcodes.pro/zip/21670.json

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