Zip code 21778: Rocky Ridge, Maryland

Q: What city is zip code 21778?

21778 is assigned to Rocky Ridge, Maryland. The city name is the one the Postal Service prefers for mail addressed to this zip code.

Q: What county is 21778 in?

21778 is in Frederick County, Maryland.

Q: What is the population of 21778?

About 745 people live in 21778, according to the Census Bureau's American Community Survey.

Q: What is the median household income in 21778?

The median household income in 21778 is $76,458.

Q: What zip codes are near 21778?

The closest zip codes to 21778 are 21759, 21757, 21775, 21788, 21727.

Residential delivery areaFrederick CountyEastern Time

Population

745

Median household income

$76K

U.S. $81K

Median home value

$382K

U.S. $333K

Median rent

—

U.S. $1,413

Median age

58.4

U.S. 38.9

Land area

18 sq mi

41 people/sq mi

Boundary is the Census Bureau's ZIP Code Tabulation Area, which closely tracks the postal delivery area.

About 21778

21778 is a rural zip code in Rocky Ridge, Maryland (Frederick County), covering 18 sq mi of land. About 745 people live here, or 41 per square mile. The median resident is 58.4 years old, compared with 38.9 nationally.

The median household earns $76,458 a year, close to the national median of $80,734. 0.9% of residents live below the poverty line (U.S.: 12.5%). A typical home is valued at $382,100, or 5.0 years of median household income (U.S.: 4.1 years), which makes homes about as affordable as the national average for local earners. 81% of occupied homes are lived in by their owners.

27% of adults hold a bachelor's degree or higher (U.S.: 36%). Commuters average 26 minutes each way, and 32% of workers work from home. The most common jobs among working residents are in management; construction and repair; and office and administrative support. 18% of them are self-employed (U.S.: 10%).

How 21778 compares

Sorted from highest to lowest national percentile

Median age58.4
99th
U.S. 38.9 · MD 39.431st of 446 in MD
Rent-burdened renters75.8%
99th
WeaknessU.S. 51.1% · MD 51.5%45th of 404 in MD
Residents 65 and older33.7%
98th
U.S. 17.2% · MD 16.7%32nd of 446 in MD
Work from home31.6%
96th
U.S. 15.1% · MD 19.3%36th of 444 in MD
Self-employed workers18.2%
96th
U.S. 10% · MD 8.7%45th of 444 in MD
Income inequality (Gini)0.483
82nd
WeaknessU.S. 0.483 · MD 0.45651st of 438 in MD
Homeownership rate81.3%
81st
StrengthU.S. 65.2% · MD 67.6%228th of 441 in MD
Per capita income$54,798
79th
U.S. $44,673 · MD $52,979192nd of 446 in MD
Unemployment rate6.5%
74th
U.S. 5.2% · MD 4.9%95th of 444 in MD
Median earnings per worker$52,235
61st
U.S. $49,666 · MD $61,200299th of 443 in MD
Median home value$382,100
59th
U.S. $332,700 · MD $419,900250th of 421 in MD
Average commute26 min
50th
U.S. 26.4 min · MD 31.1 min348th of 421 in MD
Median household income$76,458
46th
U.S. $80,734 · MD $103,678334th of 414 in MD
Bachelor's degree or higher27%
39th
U.S. 35.7% · MD 43.4%312th of 445 in MD
Veterans2.4%
10th
U.S. 6.2% · MD 6.8%414th of 446 in MD
Residents under 1815.7%
10th
U.S. 22% · MD 22.2%373rd of 446 in MD
Population density41/sq mi
6th
U.S. 95/sq mi · MD 639/sq mi412th of 446 in MD
Uninsured rate1.7%
4th
StrengthU.S. 8.4% · MD 6.3%346th of 444 in MD
Government workers6.7%
3rd
U.S. 14.5% · MD 22.5%419th of 444 in MD
Population745
1st
U.S. 334,922,499 · MD 6,206,011369th of 446 in MD
Poverty rate0.9%
1st
StrengthU.S. 12.5% · MD 9.4%409th of 441 in MD
Diversity index0
1st
U.S. 61.4 · MD 67.7439th of 446 in MD
Broadband access56.3%
1st
WeaknessU.S. 91% · MD 92.4%438th of 441 in MD
Foreign-born residents0%
1st
U.S. 14.1% · MD 16.6%421st of 446 in MD
Housing vacancy0%
1st
U.S. 10.1% · MD 7.7%421st of 441 in MD
Tech workers0%
1st
U.S. 3.8% · MD 6.4%408th of 444 in MD
Healthcare workers0%
1st
U.S. 9.7% · MD 9%427th of 444 in MD

Measure	21778	Frederick	MD	U.S.	National percentile	Rank in MD
Median age	58.4	39	39.4	38.9	99th	31st of 446
Rent-burdened rentersWeakness	75.8%	48.5%	51.5%	51.1%	99th	45th of 404
Residents 65 and older	33.7%	15.3%	16.7%	17.2%	98th	32nd of 446
Work from home	31.6%	21.2%	19.3%	15.1%	96th	36th of 444
Self-employed workers	18.2%	8.2%	8.7%	10%	96th	45th of 444
Income inequality (Gini)Weakness	0.483	0.398	0.456	0.483	82nd	51st of 438
Homeownership rateStrength	81.3%	77%	67.6%	65.2%	81st	228th of 441
Per capita income	$54,798	$54,982	$52,979	$44,673	79th	192nd of 446
Unemployment rate	6.5%	3.3%	4.9%	5.2%	74th	95th of 444
Median earnings per worker	$52,235	$67,763	$61,200	$49,666	61st	299th of 443
Median home value	$382,100	$464,600	$419,900	$332,700	59th	250th of 421
Average commute	26 min	33.1 min	31.1 min	26.4 min	50th	348th of 421
Median household income	$76,458	$122,002	$103,678	$80,734	46th	334th of 414
Bachelor's degree or higher	27%	45.8%	43.4%	35.7%	39th	312th of 445
Veterans	2.4%	7.5%	6.8%	6.2%	10th	414th of 446
Residents under 18	15.7%	23.3%	22.2%	22%	10th	373rd of 446
Population density	41/sq mi	435/sq mi	639/sq mi	95/sq mi	6th	412th of 446
Uninsured rateStrength	1.7%	4.7%	6.3%	8.4%	4th	346th of 444
Government workers	6.7%	21.4%	22.5%	14.5%	3rd	419th of 444
Population	745	287,048	6,206,011	334,922,499	1st	369th of 446
Poverty rateStrength	0.9%	6%	9.4%	12.5%	1st	409th of 441
Diversity index	0	53.6	67.7	61.4	1st	439th of 446
Broadband accessWeakness	56.3%	93.2%	92.4%	91%	1st	438th of 441
Foreign-born residents	0%	13.8%	16.6%	14.1%	1st	421st of 446
Housing vacancy	0%	3.9%	7.7%	10.1%	1st	421st of 441
Tech workers	0%	6.8%	6.4%	3.8%	1st	408th of 444
Healthcare workers	0%	7.8%	9%	9.7%	1st	427th of 444

The percentile is the share of Americans who live in a zip code with a lower value, so the 50th percentile is typical. Rank 1 is the highest value in the state. Both include zip codes with at least 100 residents. Strengths and weaknesses mark measures in the best or worst fifth nationally, where higher or lower is clearly better (income, poverty, education, commute, broadband, insurance and similar). Measures like age or density are left unmarked.

People

Age

Under 5

12%

5–17

13%

18–24

25–34

35–44

13%

45–54

20%

55–64

15%

65–74

19%

75+

Median age

58.4

Under 18

15.7%

65 and over

33.7%

Race and ethnicity

White100%
Black0%
Hispanic0%
Asian0%
Native American0%
Pacific Islander0%
Other0%
Multiracial0%

Diversity index

U.S. 61.4

Foreign-born

U.S. 14.1%

Born in state

75.4%

Language spoken at home (households)

English only

100%

Spanish

Other Indo-European

Asian / Pacific

Other

Households

Households: 332
Average household size: 2.2
Family households: 47.3%
Married couples: 44.9%
Living alone: 52.7%
Veterans (of adults): 2.4%
Male / female: 39% / 61%

Income and poverty

Household income distribution

<$25k

26%

$25–50k

$50–75k

16%

$75–100k

10%

$100–150k

18%

$150–200k

$200k+

20%

Median household income

21778

$76,458

Frederick Co.

$122,002

Maryland

$103,678

United States

$80,734

Per capita income

$54,798

U.S. $44,673

Poverty rate

0.9%

U.S. 12.5%

Households earning $150K+

24.7%

U.S. 23%

Income inequality (Gini)

0.483

U.S. 0.483

Housing

Median home value

21778

$382,100

Frederick Co.

$464,600

Maryland

$419,900

United States

$332,700

Median gross rent

21778

—

Frederick Co.

$1,774

Maryland

$1,705

United States

$1,413

Types of housing

Single-family

98%

2–4 units

5–19 units

20+ units

Mobile home

Boat, RV, van

Housing units: 332
Owner-occupied: 81.3%
Vacant: 0%
Median year built: 1979
Median rooms: 6.3
Renters paying 30%+ of income: 75.8%
Renters paying 50%+ of income: 75.8%
Home value to income: 5.0× (U.S. 4.1×)

Work and commute

How people get to work

Drove alone

47%

Carpooled

21%

Transit

Walked

Bicycle

Worked from home

32%

Other

Commute time (one way)

<10 min

20%

10–19

39%

20–29

13%

30–44

14%

45–59

60+

Average commute

26 min

U.S. 26.4 min

Unemployment

6.5%

U.S. 5.2%

In labor force

52.9%

U.S. 63.5%

Jobs and careers

What employed residents do, wherever they work

Occupations

Management

26%

Construction and repair

22%

Office and admin

21%

Business and finance

14%

Police and fire

Engineering and science

Production

Transportation and moving

Computer and math

Education

Legal and social services

Arts, media and sports

Healthcare

Food service

Cleaning and personal care

Sales

Farming, fishing and forestry

Industries

Construction

33%

Agriculture and mining

11%

Health care and social assistance

10%

Professional and technical services

Transportation, warehousing and utilities

Public administration

Retail

Manufacturing

Restaurants and hotels

Other services

Admin, support and management

Finance, insurance and real estate

Education

Wholesale

Information

Arts and recreation

Median earnings per worker

$52,235

U.S. $49,666

Self-employed

18.2%

U.S. 10%

Government workers

6.7%

U.S. 14.5%

Nonprofit workers

17.3%

U.S. 8.8%

Median earnings by type of work

Type of work	21778	U.S.
Management, business, science and arts	$94,688	$74,888
Service	—	$26,804
Sales and office	$39,737	$40,476
Construction and maintenance	$50,947	$49,199
Production and transportation	—	$39,989

Education, internet and health coverage

Highest education (adults 25+)

No diploma

17%

High school

31%

Some college

15%

Associate's

11%

Bachelor's

12%

Graduate

15%

High school graduate or higher: 83.4%
Bachelor's degree or higher: 27%
Graduate or professional degree: 14.5%
Households with broadband: 56.3%
Cable, fiber or DSL: 17.5%
No internet access: 39.2%
Without health insurance: 1.7%
Limited-English households: 0%

Geography

City (USPS): Rocky Ridge
State: Maryland
County: Frederick County
Center point: 39.6158° N, 77.3284° W
Land area: 18 sq mi
Water area: 0.4 sq mi
Time zone: Eastern Time (UTC-5, UTC-4 in summer)
Zip type: Residential delivery area

Zip codes near 21778

Search by radius

Zip	City	Distance	Population	IncomeMedian income	Home value
21759	Ladiesburg, MD · PO box	3.8 mi	—	—	—
21757	Keymar, MD	4 mi	2,671	$100,500	$466,100
21775	New Midway, MD · PO box	4 mi	—	—	—
21788	Thurmont, MD	4.9 mi	11,654	$98,856	$379,200
21727	Emmitsburg, MD	5 mi	6,052	$95,236	$331,100
21798	Woodsboro, MD	5.7 mi	2,928	$116,607	$498,400
21780	Sabillasville, MD	8.6 mi	2,159	$83,785	$451,600
21793	Walkersville, MD	8.8 mi	10,719	$121,971	$459,400
21787	Taneytown, MD	9.3 mi	11,645	$91,682	$355,000
21791	Union Bridge, MD	9.4 mi	5,340	$93,015	$379,800
21762	Libertytown, MD	10 mi	139	—	—
21709	Frederick, MD · PO box	11 mi	—	—	—

Questions about 21778

What city is zip code 21778?

21778 is assigned to Rocky Ridge, Maryland. The city name is the one the Postal Service prefers for mail addressed to this zip code.

What county is 21778 in?

21778 is in Frederick County, Maryland.

What is the population of 21778?

About 745 people live in 21778, according to the Census Bureau's American Community Survey.

What time zone is 21778 in?

21778 is in Eastern Time.

What is the median household income in 21778?

The median household income in 21778 is $76,458.

What zip codes are near 21778?

The closest zip codes to 21778 are 21759, 21757, 21775, 21788, 21727.

Demographic figures are 2020–2024 American Community Survey 5-year estimates for ZIP Code Tabulation Area 21778, from the U.S. Census Bureau. Small areas have wide margins of error. How we build these numbers.