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/ROCKY-RIDGE

Rocky Ridge ZIP code, Maryland

The ZIP code for Rocky Ridge, MD is 21778, and its area codes are 240, 227 and 301.

USPS city name
1 ZIP code
Population
745
Area codes
240, 227, 301

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

Rocky Ridge in numbers

About 745 people live in Rocky Ridge, in 332 households. The median household income is $76,458 a year, 26% below the Maryland median of $103,678 (US: $80,734). The median owner-occupied home is valued at $382,100 (9% below the Maryland median).

Population745Rocky Ridge745
Households332Rocky Ridge332
Median household income$76,458Rocky Ridge$76,458Maryland$103,678US $80,734
Median home value$382,100Rocky Ridge$382,100Maryland$419,900US $332,700

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

ZIP codes addressed as Rocky Ridge

ZIP codes with the USPS city name Rocky Ridge
ZIP City Type Population Median income Median home
21778 Rocky Ridge , MD Standard 745 $76,458 $382,100

Map of Rocky Ridge ZIP codes

21778

The ZIP codes of Rocky Ridge, 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 Rocky Ridge

The nearest larger towns are Thurmont (6,254 people, 4.2 mi), Woodsboro (1,540 people, 5.7 mi) and Emmitsburg (2,845 people, 6.2 mi).

Towns near Rocky Ridge
TownPopulationDistance
Thurmont 6,254 4.2 mi
Emmitsburg 2,845 6.2 mi
Taneytown 7,932 9.0 mi
Carroll Valley, PA 3,992 9.8 mi
Walkersville 6,414 10.0 mi
Frederick 83,395 13.4 mi
Smithsburg 3,115 13.7 mi
Linganore 14,444 14.0 mi
Wayne Heights, PA 3,293 14.5 mi
Spring Ridge 5,922 14.6 mi
Lake Heritage, PA 2,997 15.3 mi
Gettysburg, PA 8,254 15.7 mi
Littlestown, PA 4,850 15.7 mi
Bartonsville 3,282 15.7 mi

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

Cite this page

zipcodes.pro. “Rocky Ridge, MD ZIP codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/city/md/rocky-ridge

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