21778 ZIP Code
Rocky ridge, Maryland
December 10, 2025
| ZIP Code: | 21778 |
| City/Town: | Rocky ridge |
| County: | Frederick |
| State: | Maryland |
| Population: | 880 |
| Median Household Income: | $76,063 |
| Per Capita Income: | $37,165 |
| Total Housing Units: | 412 |
| Median Home Value: | $373,100 |
| Land Area: | 18.2 sq miles
47.2 sq km |
| Water Area: | 0.4 sq miles
0.9 sq km |
| Coordinates: | 39.6158, -77.3284 |
Population Information (21778 zip code)
| Number | Percent | |
|---|---|---|
| Total Population: | 880 | -- |
| Male: | 418 | 47.5% |
| Female: | 462 | 52.5% |
| Median Age: | 54.6 yrs | -- |
| Under 5 years: | 38 | 4.3% |
| 5 to 9 years: | 6 | 0.7% |
| 10 to 14 years: | 32 | 3.6% |
| 15 to 19 years: | 60 | 6.8% |
| 20 to 24 years: | 76 | 8.6% |
| 25 to 34 years: | 31 | 3.5% |
| 35 to 44 years: | 32 | 3.6% |
| 45 to 54 years: | 171 | 19.4% |
| 55 to 59 years: | 34 | 3.9% |
| 60 to 64 years: | 98 | 11.1% |
| 65 to 74 years: | 167 | 19.0% |
| 75 to 84 years: | 118 | 13.4% |
| 85 years and over: | 17 | 1.9% |
Housing Information (21778 zip code)
| Number | Percent | |
|---|---|---|
| Median home value: | $373,100 | -- |
| Median rooms: | 6.5 | -- |
| Median rent: | -- / mo. | -- |
| Total housing units: | 412 | -- |
| Occupied housing units: | 373 | 90.5% |
| Vacant housing units: | 39 | 9.5% |
| Housing tenure: | -- | -- |
| Owner-occupied: | 342 | 91.7% |
| Renter-occupied: | 31 | 8.3% |
Educational Attainment (21778 zip code)
| Number | Percent | |
|---|---|---|
| Population 25 years and over: | 668 | -- |
| Less than 9th grade: | 30 | 4.5% |
| 9th to 12th grade, no diploma: | 36 | 5.4% |
| High school graduate: | 273 | 40.9% |
| Some college, no degree: | 120 | 18.0% |
| Associate degree: | 91 | 13.6% |
| Bachelor's degree: | 38 | 5.7% |
| Graduate or professional degree: | 80 | 12.0% |
| Percent high school graduate or higher: | -- | 90.1% |
| Percent bachelor's degree or higher: | -- | 17.7% |
Income Information (21778 zip code)
| Value | |
|---|---|
| Median household income: | $76,063 / yr. |
| Mean household income: | $116,112 / yr. |
| Median family income: | $136,806 / yr. |
| Per capita income: | $37,165 / yr. |
Employment (21778 zip code)
| Number | Percent | |
|---|---|---|
| In labor force: | 419 | -- |
| Employed: | 402 | 95.9% |
| Unemployed: | 17 | 4.1% |
| Not in labor force: | 385 | -- |
| Class of Worker: | -- | -- |
| Private wage and salary: | 277 | 68.9% |
| Government workers: | 75 | 18.7% |
| Self-employed: | 50 | 12.4% |
| Unpaid family workers: | 0 | 0.0% |
Race & Ethnicity (21778 zip code)
| Number | Percent | |
|---|---|---|
| Race (one race): | -- | -- |
| White: | 880 | 100.0% |
| Black or African American: | 0 | 0.0% |
| American Indian/Alaska Native: | 0 | 0.0% |
| Asian: | 0 | 0.0% |
| Native Hawaiian/Pacific Islander: | 0 | 0.0% |
| Some other race: | 0 | 0.0% |
| Two or more races: | 0 | 0.0% |
| Hispanic or Latino (any race): | 0 | 0.0% |
| Mexican: | 0 | 0.0% |
| Puerto Rican: | 0 | 0.0% |
| Cuban: | 0 | 0.0% |
| Other Hispanic or Latino: | 0 | 0.0% |
| Not Hispanic or Latino: | 0 | 0.0% |
Income Distribution (21778 zip code)
| Household Income | Households | Percent |
|---|---|---|
| Less than $10,000: | 10 | 2.7% |
| $10,000 to $14,999: | 0 | 0.0% |
| $15,000 to $24,999: | 40 | 10.7% |
| $25,000 to $34,999: | 6 | 1.6% |
| $35,000 to $49,999: | 8 | 2.1% |
| $50,000 to $74,999: | 114 | 30.6% |
| $75,000 to $99,999: | 27 | 7.2% |
| $100,000 to $149,999: | 54 | 14.5% |
| $150,000 to $199,999: | 58 | 15.5% |
| $200,000 or more: | 56 | 15.0% |
Commute to Work (21778 zip code)
| Commute Method | Workers | Percent |
|---|---|---|
| Drove alone: | 265 | 65.9% |
| Carpooled: | 56 | 13.9% |
| Public transportation: | 0 | 0.0% |
| Walked: | 7 | 1.7% |
| Other means: | 0 | 0.0% |
| Worked from home: | 46 | 11.4% |
| Mean travel time to work: | 28.5 min | -- |
Industry (21778 zip code)
| Industry Sector | Workers | Percent |
|---|---|---|
| Agriculture, forestry, fishing, mining: | 31 | 7.7% |
| Construction: | 129 | 32.1% |
| Manufacturing: | 10 | 2.5% |
| Wholesale trade: | 0 | 0.0% |
| Retail trade: | 50 | 12.4% |
| Transportation, warehousing, utilities: | 8 | 2.0% |
| Information: | 0 | 0.0% |
| Finance, insurance, real estate: | 9 | 2.2% |
| Professional, scientific, management: | 21 | 5.2% |
| Education, health care, social services: | 62 | 15.4% |
| Arts, entertainment, food services: | 14 | 3.5% |
| Other services: | 7 | 1.7% |
| Public administration: | 61 | 15.2% |
Poverty Status (21778 zip code)
| Number | Percent | |
|---|---|---|
| Poverty Rate: | -- | 4.3% |
| All people below poverty level: | -888,888,888 | -- |
| Under 18 years: | -888,888,888 | 100.0% |
| 18 to 64 years: | -888,888,888 | 100.0% |
| 65 years and over: | -888,888,888 | 100.0% |
Health Insurance (21778 zip code)
| Number | Percent | |
|---|---|---|
| With health insurance: | 834 | 94.8% |
| Private health insurance: | 668 | 75.9% |
| Public health coverage: | 309 | 35.1% |
| Without health insurance: | 46 | 5.2% |
Benefits & Assistance (21778 zip code)
| Households with: | Number | Percent |
|---|---|---|
| Earnings: | 207 | 55.5% |
| Social Security income: | 208 | 55.8% |
| Retirement income: | 137 | 36.7% |
| Supplemental Security Income (SSI): | 6 | 1.6% |
| Cash public assistance income: | 6 | 1.6% |
| SNAP (food stamps) benefits: | 16 | 4.3% |
Housing Types (21778 zip code)
| Structure Type | Units | Percent |
|---|---|---|
| 1-unit, detached: | 363 | 88.1% |
| 1-unit, attached: | 28 | 6.8% |
| 2 units: | 0 | 0.0% |
| 3 or 4 units: | 0 | 0.0% |
| 5 to 9 units: | 0 | 0.0% |
| 10 to 19 units: | 0 | 0.0% |
| 20 or more units: | 7 | 1.7% |
| Mobile home: | 14 | 3.4% |
| Boat, RV, van, etc.: | 0 | 0.0% |
Year Structure Built (21778 zip code)
| Year Built | Units | Percent |
|---|---|---|
| Built 2020 or later: | 0 | 0.0% |
| Built 2010 to 2019: | 0 | 0.0% |
| Built 2000 to 2009: | 35 | 8.5% |
| Built 1990 to 1999: | 13 | 3.2% |
| Built 1980 to 1989: | 23 | 5.6% |
| Built 1970 to 1979: | 125 | 30.3% |
| Built 1960 to 1969: | 67 | 16.3% |
| Built 1950 to 1959: | 11 | 2.7% |
| Built 1940 to 1949: | 15 | 3.6% |
| Built 1939 or earlier: | 123 | 29.9% |
Bedrooms (21778 zip code)
| Number of Bedrooms | Units | Percent |
|---|---|---|
| No bedroom (studio): | 7 | 1.7% |
| 1 bedroom: | 0 | 0.0% |
| 2 bedrooms: | 30 | 7.3% |
| 3 bedrooms: | 284 | 68.9% |
| 4 bedrooms: | 62 | 15.0% |
| 5 or more bedrooms: | 29 | 7.0% |
Heating Fuel (21778 zip code)
| Fuel Type | Units | Percent |
|---|---|---|
| Utility gas: | 36 | 9.7% |
| Bottled, tank, or LP gas: | 45 | 12.1% |
| Electricity: | 153 | 41.0% |
| Fuel oil, kerosene, etc.: | 81 | 21.7% |
| Coal or coke: | 0 | 0.0% |
| Wood: | 58 | 15.5% |
| Solar energy: | 0 | 0.0% |
| Other fuel: | 0 | 0.0% |
| No fuel used: | 0 | 0.0% |
Vehicles Available (21778 zip code)
| Vehicles | Households | Percent |
|---|---|---|
| No vehicle available: | 47 | 12.6% |
| 1 vehicle available: | 42 | 11.3% |
| 2 vehicles available: | 141 | 37.8% |
| 3 or more vehicles available: | 143 | 38.3% |
Home Value Distribution (21778 zip code)
| Value Range | Owner Units | Percent |
|---|---|---|
| Less than $50,000: | 0 | 0.0% |
| $50,000 to $99,999: | 0 | 0.0% |
| $100,000 to $149,999: | 6 | 1.8% |
| $150,000 to $199,999: | 0 | 0.0% |
| $200,000 to $299,999: | 146 | 42.7% |
| $300,000 to $499,999: | 72 | 21.1% |
| $500,000 to $999,999: | 103 | 30.1% |
| $1,000,000 or more: | 15 | 4.4% |
Housing Costs (21778 zip code)
| Value | |
|---|---|
| Median owner costs (with mortgage): | $2,708 / mo. |
| Median owner costs (no mortgage): | $333 / mo. |
| Median gross rent: | -- / mo. |
| Average household size (owner-occupied): | 2.38 |
| Average household size (renter-occupied): | 2.13 |
Households (21778 zip code)
| Number | Percent | |
|---|---|---|
| Total households: | 373 | -- |
| Married-couple households: | 176 | 47.2% |
| Cohabiting couple households: | 33 | 8.8% |
| Male householder, no spouse: | 11 | 2.9% |
| Female householder, no spouse: | 166 | 44.5% |
| Householder living alone: | 56 | 15.0% |
| 65 years and over living alone: | 225 | 60.3% |
| Average household size: | 2.36 | -- |
| Average family size: | 3.09 | -- |
Marital Status (21778 zip code)
| Population 15 years and over | Number | Percent |
|---|---|---|
| Total: | 359 | -- |
| Never married: | 131 | 36.5% |
| Now married: | 181 | 50.4% |
| Separated: | 0 | 0.0% |
| Widowed: | 47 | 13.1% |
| Divorced: | 75 | 20.9% |
School Enrollment (21778 zip code)
| Population 3 years and over | Number | Percent |
|---|---|---|
| Enrolled in school: | 123 | -- |
| Nursery school, preschool: | 0 | 0.0% |
| Kindergarten: | 0 | 0.0% |
| Elementary school (grades 1-8): | 30 | 24.4% |
| High school (grades 9-12): | 50 | 40.7% |
| College or graduate school: | 43 | 35.0% |
Veterans & Disability (21778 zip code)
| Number | Percent | |
|---|---|---|
| Civilian population 18 years and over: | 787 | -- |
| Veterans: | 71 | 9.0% |
| Civilian noninstitutionalized population: | 880 | -- |
| With a disability: | 180 | 20.5% |
| Under 18 with disability: | 0 | 0.0% |
| 18 to 64 with disability: | 55 | 30.6% |
| 65 and over with disability: | 125 | 69.4% |
Mobility (Residence 1 Year Ago) (21778 zip code)
| Population 1 year and over | Number | Percent |
|---|---|---|
| Same house: | 880 | 100.0% |
| Different house: | 0 | 0.0% |
| Same county: | 0 | -- |
| Different county: | 0 | -- |
| Different state: | 0 | -- |
| Abroad: | 0 | -- |
Place of Birth (21778 zip code)
| Number | Percent | |
|---|---|---|
| Native born: | 873 | 99.2% |
| Foreign born: | 0 | 0.0% |
| Naturalized citizen: | 7 | -- |
| Not a citizen: | 7 | -- |
| Foreign-born by region: | -- | -- |
| Europe: | 7 | -- |
| Asia: | 0 | -- |
| Africa: | 0 | -- |
| Oceania: | 0 | -- |
| Latin America: | 0 | -- |
| Northern America: | 0 | -- |
Language Spoken at Home (21778 zip code)
| Population 5 years and over | Number | Percent |
|---|---|---|
| Total: | 842 | -- |
| English only: | 835 | 99.2% |
| Language other than English: | 7 | 0.8% |
| By language: | -- | -- |
| Spanish: | 0 | 0.0% |
| Other Indo-European languages: | 7 | 0.8% |
| Asian/Pacific Island languages: | 0 | 0.0% |
| Other languages: | 0 | 0.0% |
Computers & Internet (21778 zip code)
| Households | Percent | |
|---|---|---|
| Households with a computer: | 373 | 100.0% |
| Households with broadband internet: | 262 | 70.2% |
Rocky ridge, MD21778