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/20646

20646

ZIP 20646 is La Plata, Maryland, in Charles County; area codes 240 and 301; Eastern time.

Type
Standard
Time zone
America/New_York
County
Charles
Population
21,400
Coordinates
38.5207, -76.9999
☼ Live from 20646 — La Plata, MD

Weather right now

Asking the National Weather Service…

NEXRAD radar
Finding the nearest radar…
Local time: —

Where 20646 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 20646
  • 🔢 Type 20646 into a pocket calculator and turn it upside down: ghgOZ — not quite a word, sorry.
  • ➕ As a number, 20,646 = 2 × 3 × 3 × 31 × 37. Its digits add up to 18, a total 2,332 other ZIP codes share.
  • 💾In binary, the way a computer stores it: 101000010100110
  • 🏠 Its numerical neighbours: 20645 (Issue, MD, 16 mi away) and 20650 (Leonardtown, MD, 27 mi away).
  • 🔄 Backwards, 20646 becomes 64602, which is not a ZIP code at all.
  • 👥 31 other ZIP codes are made of exactly the same digits (02466, 02646, 02664, 04266, 04626, 04662, …). The farthest-flung twin is 66420 in Dover, KS, 1,018 miles away.
  • 🧭 Farther south than 55% of all ZIP codes, and farther east than 82%.
  • 🎯1,157 miles east of the geographic center of the Lower 48, near Lebanon, Kansas.
  • 🌏 Dig straight through the Earth from 20646 and you would come out at 38.52°S, 103.00°E — 855 miles from Perth, Australia, the nearest big city to that spot.
  • ☀Longest day of the year: 14h 51m of daylight. Shortest: 9h 28m.
  • 📏 At 79.8 square miles of land, 20646 is bigger than 72% of ZIP codes — room for about 61 Central Parks.
🌙 The sky over 20646 today
  • Working out the sun…
🌋 Shake report
  • Checking the USGS…

Source: USGS.

People and housing

Population21,400This ZIP21,400
Households7,756This ZIP7,756
Housing units8,332This ZIP8,332
Median age42.9This ZIP42.9Maryland39.4US 38.9
Median household income$131,974This ZIP$131,974Maryland$103,678US $80,734
Median home value$450,200This ZIP$450,200Maryland$419,900US $332,700
Median gross rent$1,541This ZIP$1,541Maryland$1,705US $1,413
Bachelor's degree or higher34.9%This ZIP34.9%
Mean commute38.8 minThis ZIP38.8 min
Population density268.3 / sq miThis ZIP268.3 / sq mi

Business and tax activity

Business establishments528This ZIP528
Employees7,759This ZIP7,759
Annual payroll$389,596,000This ZIP$389,596,000
Tax returns filed10,750This ZIP10,750
Total adjusted gross income$1,045,188,000This ZIP$1,045,188,000

Land area

Land area79.77 sq miThis ZIP79.77 sq mi
Water area0.69 sq miThis ZIP0.69 sq mi

Other place names in 20646

Census places whose land this ZIP code overlaps. The Postal Service may accept other city names in an address, too.

ZIP codes near 20646

ZIPCityDistance
20604 Waldorf, MD 1.3 mi
20677 Port Tobacco, MD 2.7 mi
20675 Pomfret, MD 4.4 mi
20611 Bel Alton, MD 4.6 mi
20695 White Plains, MD 4.8 mi
20693 Welcome, MD 6.4 mi
20602 Waldorf, MD 7.1 mi
20632 Faulkner, MD 7.2 mi
20603 Waldorf, MD 7.6 mi
20643 Ironsides, MD 8.1 mi

Find every ZIP code within 10 miles of 20646 →

Questions about this ZIP code

Where is ZIP code 20646?

20646 is in La Plata, Maryland, in Charles County, part of the Washington-Arlington-Alexandria, DC-VA-MD-WV metropolitan area. Its published point location is 38.5207, -76.9999.

What county is 20646 in?

20646 lies in Charles County.

What area code is 20646?

La Plata uses area codes 240 and 301, from NANPA's telephone records.

What time zone is 20646 in?

20646 uses America/New_York.

How many people live in 20646?

About 21,400 people live in ZIP code 20646, in 7,756 households, at 268.3 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 20646?

$131,974 a year, against $103,678 across Maryland.

What ZIP codes are near 20646?

The closest are 20604 (1.3 mi), 20677 (2.7 mi), 20675 (4.4 mi), 20611 (4.6 mi) and 20695 (4.8 mi).

Is 20646 a PO Box ZIP code?

20646 is a standard ZIP code. A normal ZIP code with street delivery.

Download or cite

Cite this page

zipcodes.pro. “20646 ZIP Code — La Plata, Maryland (Charles County).” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/zip/20646

Machine-readable version of these facts:

curl https://zipcodes.pro/zip/20646.json

Underlying data is public domain or openly licensed — sources, vintages and licences.