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 — CITY/MD/UNIONVILLE

Unionville ZIP code, Maryland

The ZIP code for Unionville, MD is 21792.

USPS city name
1 ZIP code

ZIP codes addressed as Unionville

ZIP codes with the USPS city name Unionville
ZIP City Type
21792 Unionville , MD No street area

Towns near Unionville

Towns near Unionville
TownPopulationDistance
Mount Airy 9,805 7.1 mi
Linganore 14,444 7.5 mi
Monrovia 3,568 9.3 mi
Walkersville 6,414 9.5 mi
Spring Ridge 5,922 9.5 mi
Green Valley 13,602 9.6 mi
Bartonsville 3,282 10.7 mi
Westminster 20,445 11.9 mi
Frederick 83,395 12.5 mi
Taneytown 7,932 12.7 mi
Urbana 14,260 13.2 mi
Eldersburg 31,695 13.4 mi
Sykesville 4,491 13.4 mi
Damascus 17,640 14.1 mi

More nearby: every ZIP code in Frederick County · Maryland ZIP codes

Cite this page

zipcodes.pro. “Unionville, MD ZIP codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/city/md/unionville

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