21690

ZIP 21690 is in Chestertown, Maryland, in Queen Anne's County; area codes 410, 443 and 667; Eastern time. Chestertown has 2 ZIP codes; the other is 21620.

Type: No street area
Time zone: America/New_York
County: Queen Anne's
Metro area: Baltimore-Columbia-Towson, MD
Coordinates: 39.0346, -76.0921

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 21617, whose figures describe that area — not this ZIP code.

☼ Live from 21690 — Chestertown, MD

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Where 21690 is

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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 21690

🔢 Type 21690 into a pocket calculator and turn it upside down: OGgIZ — not quite a word, sorry.
➕ As a number, 21,690 = 2 × 3 × 3 × 5 × 241. Its digits add up to 18, a total 2,332 other ZIP codes share.
💾In binary, the way a computer stores it: 101010010111010
🏠 Its numerical neighbours: 21679 (Wye Mills, MD, 8 mi away) and 21701 (Frederick, MD, 72 mi away).
🔄 Backwards, 21690 becomes 09612, which is not a ZIP code at all.
👥 54 other ZIP codes are made of exactly the same digits (02169, 02196, 02916, 06129, 06912, 06921, …). The farthest-flung twin is 96201 in APO AA, a military post office, 7,103 miles away.
🧭 Farther south than 50% of all ZIP codes, and farther east than 85%.
🎯1,198 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
🌏 Dig straight through the Earth from 21690 and you would come out at 39.03°S, 103.91°E — 830 miles from Perth, Australia, the nearest big city to that spot.
☀Longest day of the year: 14h 55m of daylight. Shortest: 9h 25m.

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Land area

ZIP codes near 21690

ZIP	City	Distance
`21656`	Price, MD	0.0 mi
`21617`	Centreville, MD	2.7 mi
`21658`	Queenstown, MD	6.8 mi
`21679`	Wye Mills, MD	7.9 mi
`21661`	Rock Hall, MD	8.0 mi
`21657`	Queen Anne, MD	8.9 mi
`21638`	Grasonville, MD	9.0 mi
`21623`	Church Hill, MD	9.1 mi
`21619`	Chester, MD	11.3 mi
`21641`	Hillsboro, MD	11.5 mi

Find every ZIP code within 10 miles of 21690 →

Questions about this ZIP code

Where is ZIP code 21690?

21690 is in Chestertown, Maryland, in Queen Anne's County, part of the Baltimore-Columbia-Towson, MD metropolitan area. Its published point location is 39.0346, -76.0921.

What county is 21690 in?

21690 lies in Queen Anne's County.

What area code is 21690?

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

What time zone is 21690 in?

21690 uses America/New_York.

What ZIP codes are near 21690?

The closest are 21656 (0 mi), 21617 (2.7 mi), 21658 (6.8 mi), 21679 (7.9 mi) and 21661 (8 mi).

Is 21690 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. “21690 ZIP Code — Chestertown, Maryland (Queen Anne's County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/21690

Machine-readable version of these facts:

curl https://zipcodes.pro/zip/21690.json

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