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ZIP Code Database - Facts & Stats

Data Last Updated: June 1, 2023

Zip Code 21778, Rocky Ridge, MD

ZIP Code 21778 Details

Zip Code:21778
City:Rocky Ridge
State:MD [Maryland]
Multi County:No
City Alias(es):Rocky Ridge
Area Code:240 / 301
City Type:P [Post Office]
Classification: [Non-Unique]
Time Zone:Eastern (GMT -05:00)
Observes Daylight Saving:Yes
Elevation:405 ft
State FIPS:24
County FIPS:021
Division:South Atlantic
Intro Date:<2004-10

ZIP Code 21778 2020 Census Demographics

Current Population:1,170
2020 Population:1,145
Households per ZIP Code:441
Average House Value:$288,500
Avg. Income Per Household:$54,706
Persons Per Household:2.60
White Population:1,057
Black Population:4
Hispanic Population:39
Asian Population:17
American Indian Population:2
Hawaiian Population:0
Other Population:28
Male Population:534
Female Population:611
Median Age:49.30 years
Male Median Age:49.20 years
Female Median Age:49.40 years

ZIP Code 21778 Other Demographics

# Residential Mailboxes:450
# Business Mailboxes:8
Total Delivery Receptacles:502
Number of Businesses:19
1st Quarter Payroll:$1,018,000
Annual Payroll:$5,442,000
# of Employees:100
Water Area:0.366 sq mi
Land Area:18.241 sq mi
118th Congressional District:08
118th Congressional Land Area:859.85 sq mi
Single Family Delivery Units:450
Multi Family Delivery Units:0
# Residential Mailboxes:450
# Business Mailboxes:8
Total Delivery Receptacles:502

ZIP Code 21778 Social Security Benefits

  2018 2019 Delta
Total Beneficiaries: 275 270 -5
Retired Workers: 200 205 +5
Disabled Workers: 35 35 0
Widow(er)s and Parents: 20 20 0
Spouses: 15 10 -5
Children: 5 0 -5
65+: 210 210 0
Monthly Benefits - All: $389,000 $400,000 +$11,000
Monthly Benefits - Retired Workers: $291,000 $305,000 +$14,000
Monthly Benefits - Widow(ers): $36,000 $35,000 ($1,000)

ZIP Code 21778 Statistical Areas

CBSA: 47900
CBSA Name: Washington-Arlington-Alexandria, DC-VA-MD-WV
CBSA Type: Metro
CBSA Division: 23224
CBSA Division Name: Frederick-Gaithersburg-Rockville, MD
CBSA Population:0
CBSA Division Population:0
MSA: 8872
MSA Name: Washington-Baltimore, DC-MD-VA-WV CMSA
PMSA: 8840
PMSA Name: Washington, DC-MD-VA-WV PMSA
City State Key:V24294
Preferred Last Line Key:V24294
21777: Previous ZIP Code
Next ZIP Code: 21779


  1. U.S. Postal Service [Last Updated: 6/1/2023],
  2. Internal Data Creation [Last Updated: 6/1/2023],
  3. U.S. Geological Survey [Updated as needed],
  4. U.S. Census [Updated Yearly],
  5. U.S. Census American National Standards Institute (ANSI) [Last Updated: 6/1/2023],
  6. U.S. Census 2020 [Decennial] [Last Updated: 5/25/2023],
  7. Centers for Medicare & Medicaid Services [Updated Yearly],