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U.S. ZIP Code 21778
5-digit United States postal code #21778, Rocky Ridge, MD
ZIP code 21778 is located in the city (place name) Rocky Ridge, сounty Frederick in the state of Maryland. The population in ZIP code 21778 is 1094 and the population density is 24.1. ZIP code 21778 refers to сounty Frederick having сounty FIPS 24021, the ratio of people from different counties in this ZIP code is as follows: all county weights - 24021: 100%. In the area of the ZIP code 21778 valid time zone America/New_York.
ZIP: 21778
County: Frederick
Place Name: Rocky Ridge
State: Maryland
State Abbreviation: MD
Coordinates: 39° 36' 57.528" N, 77° 20' 8.952" W
Latitude: 39.615980000000
Longitude: -77.335820000000
Population: 1094
Density: 24.1/km2
Time zone: America/New_York
County FIPS: 24021
All county weights: 24021: 100%