Rocky Ridge ZIP Codes — Frederick County, MD

There is one unique ZIP code in Rocky Ridge, Maryland and it is 21778. Area code: 240/301.
1
ZIP codes
18.24
sq mi land
0.37
sq mi water
240/301
area code
Rocky Ridge, MD ZIP code map

About Rocky Ridge, MD

Rocky Ridge is a quaint town located in Maryland, within the scenic Frederick County. Known for its serene landscapes and close-knit community, this small town embodies the charm of rural living. With its singular ZIP code of 21778, Rocky Ridge provides a restful retreat from the hustle and bustle of urban life.

Location & geography

Situated in the northern part of Frederick County, Rocky Ridge offers a peaceful rural setting surrounded by the natural beauty of Maryland. It is approximately 25 miles from the bustling city of Frederick to the south and around 30 miles from the historical town of Gettysburg, Pennsylvania, to the north. The total area of Rocky Ridge encompasses 18.24 square miles of land and 0.37 square miles of water, featuring a mix of rolling hills and serene water bodies.

Community & economy

Rocky Ridge is characterized by its warm community spirit, where residents often engage in local events and activities that celebrate their shared heritage. The town's economy primarily revolves around agriculture and small local businesses, catering to the needs of the community. Daily life in Rocky Ridge is marked by a slow pace, allowing residents to enjoy the outdoors and connect with nature.

Transportation

Rocky Ridge is accessible via several local roads that connect to larger highways such as Route 15, which facilitates travel toward neighboring cities. The nearest major airport is the Baltimore/Washington International Thurgood Marshall Airport, located approximately 50 miles to the southeast. Public transit options are limited, emphasizing the need for personal vehicles for commuting and travel.

History

Rocky Ridge was founded in the early 20th century, growing as a community largely supported by agriculture and rural enterprises. While specific significant events in its history may be less recognized, the town has retained its charming, timeless character, steeped in local traditions. The acknowledgment of community events and agricultural fairs continues to shape the town's cultural identity.

Did you know?

One surprising fact about Rocky Ridge is that it offers panoramic views of the Catoctin Mountains, making it a hidden gem for nature lovers and photographers alike. Additionally, the town's tight-knit community atmosphere fosters a sense of belonging, as residents often come together for seasonal celebrations and gatherings.

ZIP codes for Rocky Ridge, MD (1)
ZIP code City County Map
21778 Rocky Ridge Frederick View map

Demographics & statistics

880
Population
54.6
Median age
$76,063
Median household income
$50,106
Per capita income
$373,100
Median home value
$0
Median monthly rent
91.7%
Home ownership
4.3%
Poverty rate
4.1%
Unemployment
381
Housing units
17.7%
Bachelor's or higher

Age distribution

Male Female
18
Under 5
20
3
5–9
3
15
10–14
17
29
15–19
31
36
20–24
40
15
25–34
16
15
35–44
17
81
45–54
90
16
55–59
18
47
60–64
51
79
65–74
88
56
75–84
62
8
85+
9
← Male
Female →

Age summary

GroupCount%
Under 189310.6%
18 and over78789.4%
65 and over30234.3%
Median age54.6 years

Race & ethnicity

White 100%
GroupCount%
White880100%

Household income

Under $10k 2.7%
$15k–$25k 10.7%
$25k–$35k 1.6%
$35k–$50k 2.1%
$50k–$75k 30.6%
$75k–$100k 7.2%
$100k–$150k 14.5%
$150k–$200k 15.5%
$200k+ 15.0%
Range% of households
Under $10k2.7%
$15k–$25k10.7%
$25k–$35k1.6%
$35k–$50k2.1%
$50k–$75k30.6%
$75k–$100k7.2%
$100k–$150k14.5%
$150k–$200k15.5%
$200k+15.0%
Median income$76,063

Housing

Home values

$100k–$150k 1.8%
$200k–$300k 42.7%
$300k–$500k 21.1%
$500k–$1M 30.1%
$1M+ 4.4%

Housing overview

MetricValue
Median home value$373,100
Median rent / month$0
Owner occupied91.7%
Renter occupied8.3%
Vacant9.5%
Single-family detached88.1%
Large apartment buildings1.7%
Mobile homes3.4%
Median rooms6.5
Avg household size (owned)2.38

Year built

Era%
2020 or later0.0%
2010–20190.0%
2000–20098.5%
1990–19993.2%
1980–19895.6%
1970–197930.3%
1960–196916.3%
1950–19592.7%
1940–19493.6%
1939 or earlier29.9%

Bedrooms

Size% of units
No bedroom (studio)1.7%
1 bedroom0.0%
2 bedrooms7.3%
3 bedrooms68.9%
4 bedrooms15.0%
5+ bedrooms7.0%

Vehicles per household

Vehicles% of households
No vehicle12.6%
1 vehicle11.3%
2 vehicles37.8%
3 or more38.3%

Heating fuel

Fuel type%
Utility gas9.7%
Electricity41.0%
Propane / LP gas12.1%
Fuel oil21.7%
Wood15.5%

Households & families

Household typeCount%
Married-couple family17647.2%
Cohabiting couple205.4%
Male householder, no spouse112.9%
Female householder, no spouse16644.5%
Households with children under 185615.0%
Households with seniors (65+)22560.3%
Average household size2.36

Marital status

StatusMaleFemale
Never married36.5%16.9%
Married50.4%39.3%
Separated0.0%0.0%
Widowed0.0%26.7%
Divorced13.1%17.1%

Education

Less than 9th grade 4.5%
Some HS, no diploma 5.4%
HS graduate 40.9%
Some college, no degree 18.0%
Associate's degree 13.6%
Bachelor's degree 5.7%
Graduate / professional 12.0%
Metric%
HS diploma or higher90.1%
Bachelor's or higher17.7%

School enrollment (ages 3–17)

TypeCount%
Nursery / preschool00.0%
Kindergarten00.0%
Elementary school3024.4%
High school5040.7%
College / grad school4335.0%

Employment

Industry of employment

Construction 32.1%
Education & healthcare 15.4%
Public administration 15.2%
Retail trade 12.4%
Agriculture & mining 7.7%
Professional & management 5.2%
Arts, food & hospitality 3.5%
Manufacturing 2.5%
Finance & real estate 2.2%
Transportation & utilities 2.0%
Other services 1.7%

Occupation

Category%
Management, business & arts34.6%
Service10.7%
Sales & office26.4%
Natural resources & construction20.6%
Production & transportation7.7%

Employment type

Type%
Private sector68.9%
Government18.7%
Self-employed12.4%
Unpaid family workers0.0%

Commute

Method%
Drive alone70.9%
Carpool15.0%
Public transit0.0%
Walk1.9%
Other means0.0%
Avg commute (minutes)28.5

Poverty

All people 4.3%
Under 18 years 9.7%
18 and over 3.7%
Married-couple families 5.7%
Female-led households 0.0%

Income support

Source% of households
Social Security55.8%
Retirement income36.7%
Supplemental Security1.6%
Cash public assistance1.6%
Food stamps / SNAP4.3%

Health indicators

Condition%
High blood pressure34.4%
High cholesterol38.6%
Heart disease6.5%
Stroke3.0%
Asthma10.2%
Arthritis26.2%
Kidney disease2.8%
Pulmonary disease7.3%
Cancer7.3%
Behavior / access%
Binge drinking16.2%
No physical activity22.8%
Less than 7 hrs sleep31.9%
Fair or poor health13.0%
Poor mental health14.8%
Poor physical health9.6%
No health insurance10.8%
Visited doctor (checkup)75.3%
Visited dentist64.9%
Cholesterol screening91.5%
Teeth loss11.7%

Veterans & disability

VeteransCount%
Civilian veterans719.0%
Disability%
Any disability20.5%
Under 180.0%
18–64 years11.3%
65 and over41.4%

Health insurance coverage

Type%
Private insurance75.9%
Public insurance35.1%
Uninsured under 198.0%

Language & origin

Language spoken at home (age 5+)

LanguageCount%
English only84295.7%
Spanish00.0%
Other Indo-European00.0%
Asian & Pacific Islander00.0%
Other languages00.0%

Place of birth & citizenship

OriginCount%
Native born (US)87399.2%
Born in same state87399.2%
Born in different state60468.6%
Foreign born00.0%
Naturalized citizen70.8%
Not a US citizen00.0%

Ancestry

AncestryCount%
Arab9610.9%
French536%
Norwegian273.1%
AncestryCount%
English222.5%
Polish202.3%
Italian70.8%

Technology access

Metric% of households
Computer access42.4%
Internet access70.2%

Source: U.S. Census Bureau, American Community Survey 2025 estimates.

Frequently asked questions
What ZIP codes does Rocky Ridge, MD have?
Rocky Ridge, MD has one ZIP code: 21778. Each ZIP code serves a distinct delivery area within the city and surrounding region.
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