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/20635

20635

ZIP 20635 is Helen, Maryland, in St. Mary's County; area codes 240, 301 and 227; Eastern time.

Type
No street area
Time zone
America/New_York
County
St. Mary's
Metro area
Lexington Park, MD
Coordinates
38.3121, -76.6077

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 20636, whose figures describe that area — not this ZIP code.

☼ Live from 20635 — Helen, MD

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Where 20635 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 20635
  • 🔢 Type 20635 into a pocket calculator and turn it upside down: SEgOZ — not quite a word, sorry.
  • ➕ As a number, 20,635 = 5 × 4127. Its digits add up to 16, a total 1,922 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 101000010011011
  • 🏠 Its numerical neighbours: 20634 (Great Mills, MD, 8 mi away) and 20636 (Hollywood, MD, 4 mi away).
  • 🔄 Backwards, 20635 becomes 53602, which is not a ZIP code at all.
  • 👥 70 other ZIP codes are made of exactly the same digits (02356, 02536, 02563, 02635, 02653, 03256, …). The farthest-flung twin is 56230 in Danube, MN, 1,052 miles away.
  • 🧭 Farther south than 56% of all ZIP codes, and farther east than 83%.
  • 🎯1,180 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 20635 and you would come out at 38.31°S, 103.39°E — 829 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 50m of daylight. Shortest: 9h 30m.
🌙 The sky over 20635 today
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Source: USGS.

Land area

ZIP codes near 20635

ZIPCityDistance
20636 Hollywood, MD 3.5 mi
20650 Leonardtown, MD 3.8 mi
20656 Loveville, MD 4.4 mi
20619 California, MD 4.5 mi
20627 Compton, MD 5.8 mi
20660 Morganza, MD 6.7 mi
20624 Clements, MD 7.1 mi
20620 Callaway, MD 7.2 mi
20615 Broomes Island, MD 7.6 mi
20634 Great Mills, MD 7.7 mi

Find every ZIP code within 10 miles of 20635 →

Questions about this ZIP code

Where is ZIP code 20635?

20635 is in Helen, Maryland, in St. Mary's County, part of the Lexington Park, MD metropolitan area. Its published point location is 38.3121, -76.6077.

What county is 20635 in?

20635 lies in St. Mary's County.

What area code is 20635?

Helen uses area codes 240, 301 and 227, from NANPA's telephone records.

What time zone is 20635 in?

20635 uses America/New_York.

What ZIP codes are near 20635?

The closest are 20636 (3.5 mi), 20650 (3.8 mi), 20656 (4.4 mi), 20619 (4.5 mi) and 20627 (5.8 mi).

Is 20635 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. “20635 ZIP Code — Helen, Maryland (St. Mary's County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/20635

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curl https://zipcodes.pro/zip/20635.json

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