Zip Code Database List
Account Login
Find ZIP+4 of Address

Find the ZIP Code, County, and +4 of any U.S. Address

FREE ZIP Code Finder

Find info on any U.S. ZIP Code

Other FREE Lookups

Lookup ZIP Code of any City, State, County or Area Code

FREE Radius Search

Find all ZIP Codes

FREE Distance Calc

Calculate the distance between two U.S. or Canadian ZIP codes.

ZIP Code Database - Facts & Stats

Data Last Updated: May 1, 2022

ZIP Codes for City of Rocky Ridge, MD

Rocky Ridge, MD Covers 1 ZIP Code

ZIP CodeTypeCountyPopulationArea Code(s)
ZIP Code 21778StandardFrederick1,094240 / 301

Timezone(s):Eastern (GMT -05:00)
Population:1,094 (More Details)
Male Population:544
Female Population:550
Median Age:45
ZIP Codes:1
Area Codes:2
Total Area:667 square miles (county)
Land Area:660 square miles (county)
Water Area:7 square miles (county)

Rocky Ridge, MD Demographic Information *

There is no Census data for the city of ROCKY RIDGE, MD. We have pulled information for the ZIP Code 21778 instead.
Total population1,094
Male population544
Female population550
Median age (years)45.1
White Population1,061
Black Population0
Indian Population4
Asian Population4
Hawaiian Population0
Hispanic Population24
Median age (Male)43.8
Median age (Female)46.5
Total households409
Family households (families)310
Average household size2.67
Average family size3
Total housing units438
* Demographic data is based on 2010 Census. Products


  1. U.S. Postal Service [Last Updated: 5/1/2022],
  2. Internal Data Creation [Last Updated: 5/1/2022],
  3. U.S. Geological Survey [Updated as needed],
  4. U.S. Census [Updated Yearly],
  5. U.S. Census 2010 [Decennial] [Last Updated: 1/1/2010],