Zip code 21104: Marriottsville, Maryland

Q: What city is zip code 21104?

21104 is assigned to Marriottsville, Maryland. The city name is the one the Postal Service prefers for mail addressed to this zip code.

Q: What county is 21104 in?

21104 is mostly in Howard County, but it extends into 2 other counties.

Q: What is the population of 21104?

About 6,052 people live in 21104, according to the Census Bureau's American Community Survey.

Q: What is the median household income in 21104?

The median household income in 21104 is $191,804.

Q: What zip codes are near 21104?

The closest zip codes to 21104 are 21163, 21794, 21042, 21723, 21784.

Residential delivery areaHoward CountyEastern Time

Population

6,052

Median household income

$192K

U.S. $81K

Median home value

$680K

U.S. $333K

Median rent

$1,384/mo

U.S. $1,413

Median age

43.1

U.S. 38.9

Land area

17 sq mi

355 people/sq mi

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

About 21104

21104 is a small-town zip code in Marriottsville, Maryland (Howard County), covering 17 sq mi of land. About 6,052 people live here, or 355 per square mile. The median resident is 43.1 years old, compared with 38.9 nationally.

The median household earns $191,804 a year, about 2.4× the national median of $80,734. 2.7% of residents live below the poverty line (U.S.: 12.5%). A typical home is valued at $680,200, or 3.5 years of median household income (U.S.: 4.1 years), which makes homes about as affordable as the national average for local earners. 97% of occupied homes are lived in by their owners, and renters pay a median of $1,384 a month.

64% of adults hold a bachelor's degree or higher (U.S.: 36%). Commuters average 31.9 minutes each way, and 21% of workers work from home. The most common jobs among working residents are in healthcare; management; and business and finance. 24% of households speak a language other than English at home, most often an Asian or Pacific Island language.

How 21104 compares

Sorted from highest to lowest national percentile

Median household income$191,804
99th
StrengthU.S. $80,734 · MD $103,67828th of 414 in MD
Homeownership rate97%
99th
StrengthU.S. 65.2% · MD 67.6%47th of 441 in MD
Broadband access98.9%
99th
StrengthU.S. 91% · MD 92.4%53rd of 441 in MD
Rent-burdened renters100%
99th
WeaknessU.S. 51.1% · MD 51.5%6th of 404 in MD
Median earnings per worker$96,613
97th
StrengthU.S. $49,666 · MD $61,20039th of 443 in MD
Healthcare workers14.8%
94th
U.S. 9.7% · MD 9%34th of 444 in MD
Per capita income$74,405
93rd
StrengthU.S. $44,673 · MD $52,97952nd of 446 in MD
Bachelor's degree or higher64.4%
92nd
StrengthU.S. 35.7% · MD 43.4%46th of 445 in MD
Tech workers7.1%
91st
U.S. 3.8% · MD 6.4%119th of 444 in MD
Median home value$680,200
87th
U.S. $332,700 · MD $419,90044th of 421 in MD
Average commute31.9 min
83rd
WeaknessU.S. 26.4 min · MD 31.1 min195th of 421 in MD
Work from home21.1%
80th
U.S. 15.1% · MD 19.3%146th of 444 in MD
Median age43.1
78th
U.S. 38.9 · MD 39.4186th of 446 in MD
Government workers16.5%
69th
U.S. 14.5% · MD 22.5%338th of 444 in MD
Foreign-born residents16%
67th
U.S. 14.1% · MD 16.6%91st of 446 in MD
Self-employed workers10.4%
63rd
U.S. 10% · MD 8.7%160th of 444 in MD
Residents 65 and older18.1%
61st
U.S. 17.2% · MD 16.7%217th of 446 in MD
Median gross rent$1,384
49th
U.S. $1,413 · MD $1,705227th of 338 in MD
Veterans5.1%
40th
U.S. 6.2% · MD 6.8%321st of 446 in MD
Diversity index41.5
38th
U.S. 61.4 · MD 67.7228th of 446 in MD
Residents under 1820.7%
37th
U.S. 22% · MD 22.2%257th of 446 in MD
Uninsured rate5.3%
36th
U.S. 8.4% · MD 6.3%144th of 444 in MD
Housing vacancy4.9%
32nd
U.S. 10.1% · MD 7.7%239th of 441 in MD
Population density355/sq mi
28th
U.S. 95/sq mi · MD 639/sq mi240th of 446 in MD
Unemployment rate3.2%
19th
StrengthU.S. 5.2% · MD 4.9%276th of 444 in MD
Population6,052
10th
U.S. 334,922,499 · MD 6,206,011224th of 446 in MD
Income inequality (Gini)0.353
3rd
StrengthU.S. 0.483 · MD 0.456350th of 438 in MD
Poverty rate2.7%
2nd
StrengthU.S. 12.5% · MD 9.4%365th of 441 in MD

Measure	21104	Howard	MD	U.S.	National percentile	Rank in MD
Median household incomeStrength	$191,804	$149,763	$103,678	$80,734	99th	28th of 414
Homeownership rateStrength	97%	71.5%	67.6%	65.2%	99th	47th of 441
Broadband accessStrength	98.9%	96.6%	92.4%	91%	99th	53rd of 441
Rent-burdened rentersWeakness	100%	47.7%	51.5%	51.1%	99th	6th of 404
Median earnings per workerStrength	$96,613	$83,801	$61,200	$49,666	97th	39th of 443
Healthcare workers	14.8%	9.7%	9%	9.7%	94th	34th of 444
Per capita incomeStrength	$74,405	$67,501	$52,979	$44,673	93rd	52nd of 446
Bachelor's degree or higherStrength	64.4%	64.5%	43.4%	35.7%	92nd	46th of 445
Tech workers	7.1%	11.9%	6.4%	3.8%	91st	119th of 444
Median home value	$680,200	$597,900	$419,900	$332,700	87th	44th of 421
Average commuteWeakness	31.9 min	28.5 min	31.1 min	26.4 min	83rd	195th of 421
Work from home	21.1%	26%	19.3%	15.1%	80th	146th of 444
Median age	43.1	39.8	39.4	38.9	78th	186th of 446
Government workers	16.5%	22.9%	22.5%	14.5%	69th	338th of 444
Foreign-born residents	16%	22.8%	16.6%	14.1%	67th	91st of 446
Self-employed workers	10.4%	9.2%	8.7%	10%	63rd	160th of 444
Residents 65 and older	18.1%	15.2%	16.7%	17.2%	61st	217th of 446
Median gross rent	$1,384	$2,099	$1,705	$1,413	49th	227th of 338
Veterans	5.1%	6%	6.8%	6.2%	40th	321st of 446
Diversity index	41.5	70.3	67.7	61.4	38th	228th of 446
Residents under 18	20.7%	23.8%	22.2%	22%	37th	257th of 446
Uninsured rate	5.3%	4.2%	6.3%	8.4%	36th	144th of 444
Housing vacancy	4.9%	3.4%	7.7%	10.1%	32nd	239th of 441
Population density	355/sq mi	1,340/sq mi	639/sq mi	95/sq mi	28th	240th of 446
Unemployment rateStrength	3.2%	3.5%	4.9%	5.2%	19th	276th of 444
Population	6,052	336,328	6,206,011	334,922,499	10th	224th of 446
Income inequality (Gini)Strength	0.353	0.414	0.456	0.483	3rd	350th of 438
Poverty rateStrength	2.7%	5.2%	9.4%	12.5%	2nd	365th of 441

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

15%

5–17

18–24

25–34

15%

35–44

12%

45–54

18%

55–64

12%

65–74

75+

Median age

43.1

Under 18

20.7%

65 and over

18.1%

Race and ethnicity

White75%
Black6%
Hispanic1%
Asian11%
Native American0.0%
Pacific Islander0%
Other2%
Multiracial4%

Diversity index

41.5

U.S. 61.4

Foreign-born

16%

U.S. 14.1%

Born in state

53.1%

Language spoken at home (households)

English only

76%

Spanish

Other Indo-European

Asian / Pacific

15%

Other

Households

Households: 2,097
Average household size: 2.9
Family households: 80.7%
Married couples: 74.9%
Living alone: 12.8%
Veterans (of adults): 5.1%
Male / female: 50% / 50%

Income and poverty

Household income distribution

<$25k

$25–50k

$50–75k

$75–100k

$100–150k

14%

$150–200k

15%

$200k+

47%

Median household income

21104

$191,804

Howard Co.

$149,763

Maryland

$103,678

United States

$80,734

Per capita income

$74,405

U.S. $44,673

Poverty rate

2.7%

U.S. 12.5%

Households earning $150K+

62.3%

U.S. 23%

Income inequality (Gini)

0.353

U.S. 0.483

Housing

Median home value

21104

$680,200

Howard Co.

$597,900

Maryland

$419,900

United States

$332,700

Median gross rent

21104

$1,384

Howard Co.

$2,099

Maryland

$1,705

United States

$1,413

Types of housing

Single-family

97%

2–4 units

5–19 units

20+ units

Mobile home

Boat, RV, van

Housing units: 2,204
Owner-occupied: 97%
Vacant: 4.9%
Median year built: 1995
Median rooms: 8.1
Renters paying 30%+ of income: 100%
Renters paying 50%+ of income: 66.1%
Home value to income: 3.5× (U.S. 4.1×)

Work and commute

How people get to work

Drove alone

71%

Carpooled

Transit

0.4%

Walked

0.3%

Bicycle

Worked from home

21%

Other

0.6%

Commute time (one way)

<10 min

10–19

19%

20–29

21%

30–44

26%

45–59

18%

60+

10%

Average commute

31.9 min

U.S. 26.4 min

Unemployment

3.2%

U.S. 5.2%

In labor force

72.5%

U.S. 63.5%

Jobs and careers

What employed residents do, wherever they work

Occupations

Healthcare

15%

Management

14%

Business and finance

12%

Office and admin

Sales

Computer and math

Engineering and science

Food service

Construction and repair

Education

Cleaning and personal care

Transportation and moving

Arts, media and sports

Police and fire

Legal and social services

Production

Farming, fishing and forestry

Industries

Professional and technical services

18%

Health care and social assistance

17%

Finance, insurance and real estate

11%

Restaurants and hotels

10%

Education

Public administration

Construction

Manufacturing

Other services

Retail

Transportation, warehousing and utilities

Arts and recreation

Admin, support and management

Information

Agriculture and mining

0.9%

Wholesale

0.3%

Median earnings per worker

$96,613

U.S. $49,666

Self-employed

10.4%

U.S. 10%

Government workers

16.5%

U.S. 14.5%

Nonprofit workers

9.6%

U.S. 8.8%

Median earnings by type of work

Type of work	21104	U.S.
Management, business, science and arts	$128,811	$74,888
Service	$19,435	$26,804
Sales and office	$43,241	$40,476
Construction and maintenance	$72,917	$49,199
Production and transportation	$73,051	$39,989

Education, internet and health coverage

Highest education (adults 25+)

No diploma

High school

15%

Some college

15%

Associate's

Bachelor's

38%

Graduate

26%

High school graduate or higher: 98.7%
Bachelor's degree or higher: 64.4%
Graduate or professional degree: 26.3%
Households with broadband: 98.9%
Cable, fiber or DSL: 87%
No internet access: 0.5%
Without health insurance: 5.3%
Limited-English households: 1.5%

Geography

City (USPS): Marriottsville
State: Maryland
County: Howard County
Center point: 39.3469° N, 76.9128° W
Land area: 17 sq mi
Water area: 0.8 sq mi
Time zone: Eastern Time (UTC-5, UTC-4 in summer)
Zip type: Residential delivery area

21104 spans 3 counties

Howard County53% of land
Carroll County32% of land
Baltimore County15% of land

Cities and towns within this zip

Eldersburg (unincorporated)32% of zip
Ellicott City (unincorporated)3% of zip

Census places overlapping the zip's area. Mail may use a different city name than the municipality.

Zip codes near 21104

Search by radius

Zip	City	Distance	Population	IncomeMedian income	Home value
21163	Woodstock, MD	3.5 mi	7,539	$134,672	$602,800
21794	West Friendship, MD	4.4 mi	2,192	$231,466	$999,400
21042	Ellicott City, MD	4.9 mi	43,327	$190,061	$706,400
21723	Cooksville, MD	5 mi	669	$241,250	$1,005,500
21784	Sykesville, MD	5 mi	39,258	$139,395	$491,800
21133	Randallstown, MD	5.8 mi	31,398	$80,480	$322,800
21136	Reisterstown, MD	7.3 mi	32,088	$118,500	$422,100
21244	Windsor Mill, MD	7.3 mi	38,208	$85,114	$282,600
21738	Glenwood, MD	7.7 mi	3,696	$250,000+	$914,300
21041	Ellicott City, MD · PO box	7.8 mi	—	—	—
21150	Simpsonville, MD · PO box	7.8 mi	—	—	—
21797	Woodbine, MD	8.4 mi	8,643	$189,241	$735,600

Zip codes like 21104 elsewhere

Matched on income, home values, age, density, education, housing and commuting

Questions about 21104

What city is zip code 21104?

21104 is assigned to Marriottsville, Maryland. The city name is the one the Postal Service prefers for mail addressed to this zip code.

What county is 21104 in?

21104 is mostly in Howard County, but it extends into 2 other counties.

What is the population of 21104?

About 6,052 people live in 21104, according to the Census Bureau's American Community Survey.

What time zone is 21104 in?

21104 is in Eastern Time.

What is the median household income in 21104?

The median household income in 21104 is $191,804.

What zip codes are near 21104?

The closest zip codes to 21104 are 21163, 21794, 21042, 21723, 21784.

Demographic figures are 2020–2024 American Community Survey 5-year estimates for ZIP Code Tabulation Area 21104, from the U.S. Census Bureau. Small areas have wide margins of error. How we build these numbers.