Zip code 21770: Monrovia, Maryland

Q: What city is zip code 21770?

21770 is assigned to Monrovia, Maryland. The city name is the one the Postal Service prefers for mail addressed to this zip code.

Q: What county is 21770 in?

21770 is in Frederick County, Maryland.

Q: What is the population of 21770?

About 8,751 people live in 21770, according to the Census Bureau's American Community Survey.

Q: What is the median household income in 21770?

The median household income in 21770 is $183,571.

Q: What zip codes are near 21770?

The closest zip codes to 21770 are 21754, 21774, 20872, 21771, 21704.

Residential delivery areaFrederick CountyEastern Time

Population

8,751

Median household income

$184K

U.S. $81K

Median home value

$633K

U.S. $333K

Median rent

—

U.S. $1,413

Median age

39.8

U.S. 38.9

Land area

11 sq mi

764 people/sq mi

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

About 21770

21770 is a suburban zip code in Monrovia, Maryland (Frederick County), covering 11 sq mi of land. About 8,751 people live here, or 764 per square mile. The median resident is 39.8 years old, compared with 38.9 nationally.

The median household earns $183,571 a year, about 2.3× the national median of $80,734. 1.5% of residents live below the poverty line (U.S.: 12.5%). A typical home is valued at $632,500, or 3.4 years of median household income (U.S.: 4.1 years), which makes homes about as affordable as the national average for local earners. 99% of occupied homes are lived in by their owners.

55% of adults hold a bachelor's degree or higher (U.S.: 36%). Commuters average 35.2 minutes each way, and 26% of workers work from home. The most common jobs among working residents are in management; office and administrative support; and construction and repair.

How 21770 compares

Sorted from highest to lowest national percentile

Homeownership rate98.8%
99th
StrengthU.S. 65.2% · MD 67.6%35th of 441 in MD
Median household income$183,571
98th
StrengthU.S. $80,734 · MD $103,67836th of 414 in MD
Broadband access97.9%
97th
StrengthU.S. 91% · MD 92.4%69th of 441 in MD
Government workers28.5%
97th
U.S. 14.5% · MD 22.5%85th of 444 in MD
Median earnings per worker$78,009
92nd
StrengthU.S. $49,666 · MD $61,200105th of 443 in MD
Average commute35.2 min
91st
WeaknessU.S. 26.4 min · MD 31.1 min116th of 421 in MD
Tech workers7.2%
91st
U.S. 3.8% · MD 6.4%115th of 444 in MD
Work from home26.3%
90th
U.S. 15.1% · MD 19.3%68th of 444 in MD
Per capita income$58,954
84th
StrengthU.S. $44,673 · MD $52,979153rd of 446 in MD
Median home value$632,500
84th
U.S. $332,700 · MD $419,90058th of 421 in MD
Bachelor's degree or higher54.8%
84th
StrengthU.S. 35.7% · MD 43.4%94th of 445 in MD
Veterans7.2%
69th
U.S. 6.2% · MD 6.8%218th of 446 in MD
Foreign-born residents13.1%
60th
U.S. 14.1% · MD 16.6%116th of 446 in MD
Residents 65 and older17.7%
58th
U.S. 17.2% · MD 16.7%231st of 446 in MD
Median age39.8
56th
U.S. 38.9 · MD 39.4278th of 446 in MD
Residents under 1822.5%
54th
U.S. 22% · MD 22.2%190th of 446 in MD
Self-employed workers9.4%
51st
U.S. 10% · MD 8.7%200th of 444 in MD
Diversity index45.4
44th
U.S. 61.4 · MD 67.7211th of 446 in MD
Population density764/sq mi
39th
U.S. 95/sq mi · MD 639/sq mi177th of 446 in MD
Rent-burdened renters43.8%
25th
U.S. 51.1% · MD 51.5%259th of 404 in MD
Population8,751
14th
U.S. 334,922,499 · MD 6,206,011193rd of 446 in MD
Unemployment rate2.8%
14th
StrengthU.S. 5.2% · MD 4.9%298th of 444 in MD
Healthcare workers6.7%
13th
U.S. 9.7% · MD 9%291st of 444 in MD
Uninsured rate1.6%
3rd
StrengthU.S. 8.4% · MD 6.3%351st of 444 in MD
Poverty rate1.5%
1st
StrengthU.S. 12.5% · MD 9.4%393rd of 441 in MD
Housing vacancy0.4%
1st
U.S. 10.1% · MD 7.7%397th of 441 in MD
Income inequality (Gini)0.304
1st
StrengthU.S. 0.483 · MD 0.456408th of 438 in MD

Measure	21770	Frederick	MD	U.S.	National percentile	Rank in MD
Homeownership rateStrength	98.8%	77%	67.6%	65.2%	99th	35th of 441
Median household incomeStrength	$183,571	$122,002	$103,678	$80,734	98th	36th of 414
Broadband accessStrength	97.9%	93.2%	92.4%	91%	97th	69th of 441
Government workers	28.5%	21.4%	22.5%	14.5%	97th	85th of 444
Median earnings per workerStrength	$78,009	$67,763	$61,200	$49,666	92nd	105th of 443
Average commuteWeakness	35.2 min	33.1 min	31.1 min	26.4 min	91st	116th of 421
Tech workers	7.2%	6.8%	6.4%	3.8%	91st	115th of 444
Work from home	26.3%	21.2%	19.3%	15.1%	90th	68th of 444
Per capita incomeStrength	$58,954	$54,982	$52,979	$44,673	84th	153rd of 446
Median home value	$632,500	$464,600	$419,900	$332,700	84th	58th of 421
Bachelor's degree or higherStrength	54.8%	45.8%	43.4%	35.7%	84th	94th of 445
Veterans	7.2%	7.5%	6.8%	6.2%	69th	218th of 446
Foreign-born residents	13.1%	13.8%	16.6%	14.1%	60th	116th of 446
Residents 65 and older	17.7%	15.3%	16.7%	17.2%	58th	231st of 446
Median age	39.8	39	39.4	38.9	56th	278th of 446
Residents under 18	22.5%	23.3%	22.2%	22%	54th	190th of 446
Self-employed workers	9.4%	8.2%	8.7%	10%	51st	200th of 444
Diversity index	45.4	53.6	67.7	61.4	44th	211th of 446
Population density	764/sq mi	435/sq mi	639/sq mi	95/sq mi	39th	177th of 446
Rent-burdened renters	43.8%	48.5%	51.5%	51.1%	25th	259th of 404
Population	8,751	287,048	6,206,011	334,922,499	14th	193rd of 446
Unemployment rateStrength	2.8%	3.3%	4.9%	5.2%	14th	298th of 444
Healthcare workers	6.7%	7.8%	9%	9.7%	13th	291st of 444
Uninsured rateStrength	1.6%	4.7%	6.3%	8.4%	3rd	351st of 444
Poverty rateStrength	1.5%	6%	9.4%	12.5%	1st	393rd of 441
Housing vacancy	0.4%	3.9%	7.7%	10.1%	1st	397th of 441
Income inequality (Gini)Strength	0.304	0.398	0.456	0.483	1st	408th of 438

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

18%

5–17

18–24

10%

25–34

19%

35–44

12%

45–54

12%

55–64

14%

65–74

75+

Median age

39.8

Under 18

22.5%

65 and over

17.7%

Race and ethnicity

White72%
Black8%
Hispanic3%
Asian12%
Native American0%
Pacific Islander0%
Other0%
Multiracial5%

Diversity index

45.4

U.S. 61.4

Foreign-born

13.1%

U.S. 14.1%

Born in state

43.8%

Language spoken at home (households)

English only

83%

Spanish

Other Indo-European

Asian / Pacific

10%

Other

Households

Households: 2,622
Average household size: 3.3
Family households: 88%
Married couples: 78.2%
Living alone: 9%
Veterans (of adults): 7.2%
Male / female: 49% / 51%

Income and poverty

Household income distribution

<$25k

$25–50k

$50–75k

10%

$75–100k

$100–150k

14%

$150–200k

20%

$200k+

44%

Median household income

21770

$183,571

Frederick Co.

$122,002

Maryland

$103,678

United States

$80,734

Per capita income

$58,954

U.S. $44,673

Poverty rate

1.5%

U.S. 12.5%

Households earning $150K+

63.7%

U.S. 23%

Income inequality (Gini)

0.304

U.S. 0.483

Housing

Median home value

21770

$632,500

Frederick Co.

$464,600

Maryland

$419,900

United States

$332,700

Median gross rent

21770

—

Frederick Co.

$1,774

Maryland

$1,705

United States

$1,413

Types of housing

Single-family

100%

2–4 units

5–19 units

20+ units

Mobile home

Boat, RV, van

Housing units: 2,632
Owner-occupied: 98.8%
Vacant: 0.4%
Median year built: 1988
Median rooms: 9 or more
Renters paying 30%+ of income: 43.8%
Renters paying 50%+ of income: 0%
Home value to income: 3.4× (U.S. 4.1×)

Work and commute

How people get to work

Drove alone

67%

Carpooled

Transit

Walked

Bicycle

Worked from home

26%

Other

0.0%

Commute time (one way)

<10 min

10–19

13%

20–29

30%

30–44

21%

45–59

13%

60+

20%

Average commute

35.2 min

U.S. 26.4 min

Unemployment

2.8%

U.S. 5.2%

In labor force

68.3%

U.S. 63.5%

Jobs and careers

What employed residents do, wherever they work

Occupations

Management

18%

Office and admin

13%

Construction and repair

12%

Education

Computer and math

Sales

Healthcare

Business and finance

Engineering and science

Transportation and moving

Food service

Arts, media and sports

Police and fire

Production

Cleaning and personal care

Legal and social services

0.1%

Farming, fishing and forestry

Industries

Professional and technical services

14%

Public administration

14%

Education

11%

Health care and social assistance

Retail

Construction

Finance, insurance and real estate

Restaurants and hotels

Other services

Information

Admin, support and management

Manufacturing

Arts and recreation

Agriculture and mining

Transportation, warehousing and utilities

Wholesale

Median earnings per worker

$78,009

U.S. $49,666

Self-employed

9.4%

U.S. 10%

Government workers

28.5%

U.S. 14.5%

Nonprofit workers

3.4%

U.S. 8.8%

Median earnings by type of work

Type of work	21770	U.S.
Management, business, science and arts	$99,446	$74,888
Service	$21,199	$26,804
Sales and office	$42,134	$40,476
Construction and maintenance	$66,709	$49,199
Production and transportation	$25,642	$39,989

Education, internet and health coverage

Highest education (adults 25+)

No diploma

High school

16%

Some college

19%

Associate's

Bachelor's

32%

Graduate

23%

High school graduate or higher: 98%
Bachelor's degree or higher: 54.8%
Graduate or professional degree: 22.6%
Households with broadband: 97.9%
Cable, fiber or DSL: 93.3%
No internet access: 2.1%
Without health insurance: 1.6%
Limited-English households: 0.5%

Geography

City (USPS): Monrovia
State: Maryland
County: Frederick County
Center point: 39.3502° N, 77.2562° W
Land area: 11 sq mi
Water area: under 0.1 sq mi
Time zone: Eastern Time (UTC-5, UTC-4 in summer)
Zip type: Residential delivery area

Cities and towns within this zip

Green Valley (unincorporated)60% of zip
Monrovia (unincorporated)20% of zip
New Market2% of zip

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

Zip codes near 21770

Search by radius

Zip	City	Distance	Population	IncomeMedian income	Home value
21754	Ijamsville, MD	3.4 mi	8,156	$182,188	$647,300
21774	New Market, MD	4.3 mi	17,134	$171,103	$541,000
20872	Damascus, MD	4.4 mi	13,983	$141,050	$504,300
21771	Mount Airy, MD	6.1 mi	33,031	$157,302	$556,200
21704	Frederick, MD	6.4 mi	20,006	$161,063	$612,000
20871	Clarksburg, MD	6.5 mi	30,182	$177,523	$668,800
21701	Frederick, MD	7.6 mi	43,048	$106,577	$435,000
21762	Libertytown, MD	9 mi	139	—	—
21705	Frederick, MD	9.2 mi	6	—	—
21717	Buckeystown, MD	9.4 mi	245	$158,413	$430,600
21792	Unionville, MD · PO box	9.4 mi	—	—	—
21710	Adamstown, MD	9.8 mi	4,661	$163,864	$591,100

Zip codes like 21770 elsewhere

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

Questions about 21770

What city is zip code 21770?

21770 is assigned to Monrovia, Maryland. The city name is the one the Postal Service prefers for mail addressed to this zip code.

What county is 21770 in?

21770 is in Frederick County, Maryland.

What is the population of 21770?

About 8,751 people live in 21770, according to the Census Bureau's American Community Survey.

What time zone is 21770 in?

21770 is in Eastern Time.

What is the median household income in 21770?

The median household income in 21770 is $183,571.

What zip codes are near 21770?

The closest zip codes to 21770 are 21754, 21774, 20872, 21771, 21704.

Demographic figures are 2020–2024 American Community Survey 5-year estimates for ZIP Code Tabulation Area 21770, from the U.S. Census Bureau. Small areas have wide margins of error. How we build these numbers.