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/KNOXVILLE

Knoxville ZIP code, Maryland

The ZIP code for Knoxville, MD is 21758, and its area codes are 240, 301 and 227.

USPS city name
1 ZIP code
Population
4,409
Area codes
240, 301, 227

NANPA lists no telephone rate centre for Knoxville itself, so these are the area codes of the nearest one, Brunswick (2.9 miles). A town on an area-code boundary can differ from its neighbour.

Knoxville in numbers

About 4,409 people live in Knoxville, in 1,588 households. The median household income is $111,528 a year, 8% above the Maryland median of $103,678 (US: $80,734). The median owner-occupied home is valued at $424,600 (about the same as the Maryland median).

Population4,409Knoxville4,409
Households1,588Knoxville1,588
Median household income$111,528Knoxville$111,528Maryland$103,678US $80,734
Median home value$424,600Knoxville$424,600Maryland$419,900US $332,700

U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, for the ZIP code addressed as Knoxville. Survey estimates carry margins of error, wider for small places. Sources and methods.

ZIP codes addressed as Knoxville

ZIP codes with the USPS city name Knoxville
ZIP City Type Population Median income Median home
21758 Knoxville , MD Standard 4,409 $111,528 $424,600

Map of Knoxville ZIP codes

21758

The ZIP codes of Knoxville, MD, shaded. Outlines are Census ZIP Code Tabulation Areas (2020), which approximate the mail routes; PO-box and single-address codes have no area and are not drawn. Click any area to open its ZIP code.

Towns near Knoxville

The nearest larger towns are Brunswick (8,450 people, 3.0 mi), Middletown (5,014 people, 8.9 mi) and Ranson, WV (5,729 people, 12 mi).

Towns near Knoxville
TownPopulationDistance
Brunswick 8,450 3.0 mi
Lovettsville, VA 2,719 5.8 mi
Jefferson 3,314 6.3 mi
Middletown 5,014 8.9 mi
Braddock Heights 2,892 9.5 mi
Boonsboro 3,809 10.9 mi
Ranson, WV 5,729 12.5 mi
Shannondale, WV 3,465 12.7 mi
Ballenger Creek 26,390 12.8 mi
Charles Town, WV 7,337 13.5 mi
Frederick 83,395 14.1 mi
Purcellville, VA 8,973 15.2 mi
St. James 4,824 16.0 mi
Bartonsville 3,282 16.4 mi

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

Cite this page

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

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