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/MARRIOTTSVILLE

Marriottsville ZIP code, Maryland

The ZIP code for Marriottsville, MD is 21104, and its area codes are 410, 443 and 667.

USPS city name
1 ZIP code
Population
6,052
Area codes
410, 443, 667

NANPA lists no telephone rate centre for Marriottsville itself, so these are the area codes of the nearest one, Ellicott City (4.9 miles). A town on an area-code boundary can differ from its neighbour.

Marriottsville in numbers

About 6,052 people live in Marriottsville, in 2,097 households. The median household income is $191,804 a year, 85% above the Maryland median of $103,678 (US: $80,734). The median owner-occupied home is valued at $680,200 (62% above the Maryland median).

Population6,052Marriottsville6,052
Households2,097Marriottsville2,097
Median household income$191,804Marriottsville$191,804Maryland$103,678US $80,734
Median home value$680,200Marriottsville$680,200Maryland$419,900US $332,700

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

ZIP codes addressed as Marriottsville

ZIP codes with the USPS city name Marriottsville
ZIP City Type Population Median income Median home
21104 Marriottsville , MD Standard 6,052 $191,804 $680,200

Map of Marriottsville ZIP codes

The ZIP codes of Marriottsville, 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 Marriottsville

The nearest larger towns are Eldersburg (31,695 people, 4.5 mi), Randallstown (35,957 people, 6.2 mi) and Ellicott City (75,257 people, 6.4 mi).

Towns near Marriottsville
TownPopulationDistance
Sykesville 4,491 3.6 mi
Eldersburg 31,695 4.5 mi
Randallstown 35,957 6.2 mi
Ellicott City 75,257 6.4 mi
Milford Mill 30,829 7.7 mi
Owings Mills 37,245 7.9 mi
Reisterstown 25,582 9.0 mi
Woodlawn 40,379 9.3 mi
Garrison 9,469 9.4 mi
Lochearn 27,074 9.9 mi
Columbia 104,338 10.5 mi
Catonsville 43,368 10.8 mi
Pikesville 33,524 11.8 mi
Ilchester 28,364 12.1 mi

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

Cite this page

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

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