Monrovia ZIP Codes — Frederick County, MD

There is one unique ZIP code in Monrovia, Maryland and it is 21770. Area code: 240/301.

ZIP codes

11.45

sq mi land

0.01

sq mi water

240/301

area code

Monrovia, MD ZIP code map

About Monrovia, MD

Monrovia, Maryland, is a charming small town located in Frederick County. It is known for its serene residential environment and close-knit community atmosphere. With rich history and beautiful landscapes, Monrovia provides a quintessential Maryland experience for its residents and visitors alike.

Location & geography

Monrovia is situated in the central part of Maryland, approximately 20 miles south of Frederick and 40 miles northwest of Washington, D.C. The town covers a total land area of 11.45 square miles and features a very small water area of just 0.01 square miles. Its terrain is primarily characterized by scenic rolling hills and nearby access to various parks and natural areas.

Community & economy

The community in Monrovia embodies a friendly, welcoming spirit that makes it an ideal place for families and individuals seeking a peaceful lifestyle. Many residents are employed in industries ranging from education to healthcare, contributing to the local economy while enjoying the benefits of suburban living. Daily life is enriched by community events, parks, and recreational activities that foster strong social connections.

Transportation

Monrovia is easily accessible via major highways, including Interstate 70, which connects it to nearby cities and regions. The nearest named airports are the Frederick Municipal Airport and the Baltimore/Washington International Thurgood Marshall Airport, both providing convenient travel options for residents. Public transportation options are limited, making personal vehicles the primary mode of transport in the area.

History

Monrovia was officially founded in the late 19th century and has since developed into a vibrant residential community. Historically, the area served as a farming community, with agriculture being one of the key industries that shaped its growth. The town celebrates its heritage through local events and maintains a connection to its roots in American history.

Did you know?

A little-known fact about Monrovia is that it has a unique blend of small-town charm and easy access to the bustling metropolitan areas of Maryland. Additionally, it is characterized by numerous community-led initiatives that promote sustainability and local culture.

ZIP codes for Monrovia, MD (1)

ZIP code	City	County	Map
21770	Monrovia	Frederick	View map

Demographics & statistics

7,786

Population

41.4

Median age

$175,809

Median household income

$62,273

Per capita income

$570,000

Median home value

Median monthly rent

98.7%

Home ownership

0.0%

Poverty rate

2.2%

Unemployment

2,380

Housing units

56.1%

Bachelor's or higher

Age distribution

Male Female

131

Under 5

119

314

5–9

287

255

10–14

232

15–19

211

253

20–24

232

383

25–34

349

745

35–44

681

485

45–54

443

241

55–59

220

273

60–64

250

592

65–74

540

104

75–84

85+

← Male

Female →

Age summary

Group	Count	%
Under 18	1,640	21.1%
18 and over	6,146	78.9%
65 and over	1,450	18.6%
Median age	41.4 years

Race & ethnicity

White 73.8%

Asian 9.9%

Black or African American 9.9%

Two or more races 3.7%

Hispanic or Latino 1.9%

Other race 0.7%

Group	Count	%
White	5,861	73.8%
Asian	788	9.9%
Black or African American	783	9.9%
Two or more races	296	3.7%
Hispanic or Latino	153	1.9%
Other race	58	0.7%

Household income

$15k–$25k 0.7%

$25k–$35k 0.4%

$35k–$50k 1.9%

$50k–$75k 2.6%

$75k–$100k 6.3%

$100k–$150k 21.0%

$150k–$200k 24.3%

$200k+ 43.0%

Range	% of households
$15k–$25k	0.7%
$25k–$35k	0.4%
$35k–$50k	1.9%
$50k–$75k	2.6%
$75k–$100k	6.3%
$100k–$150k	21.0%
$150k–$200k	24.3%
$200k+	43.0%
Median income	$175,809

Housing

Home values

Under $50k 0.2%

$50k–$100k 1.6%

$200k–$300k 4.6%

$300k–$500k 30.8%

$500k–$1M 60.6%

$1M+ 2.3%

Housing overview

Metric	Value
Median home value	$570,000
Median rent / month	$0
Owner occupied	98.7%
Renter occupied	1.3%
Vacant	2.6%
Single-family detached	96.1%
Large apartment buildings	0.0%
Mobile homes	0.0%
Median rooms	10.0
Avg household size (owned)	3.32

Year built

Era	%
2020 or later	3.9%
2010–2019	28.0%
2000–2009	6.0%
1990–1999	9.6%
1980–1989	19.2%
1970–1979	28.5%
1960–1969	1.5%
1950–1959	0.4%
1940–1949	0.0%
1939 or earlier	2.9%

Bedrooms

Size	% of units
No bedroom (studio)	0.8%
1 bedroom	0.7%
2 bedrooms	1.0%
3 bedrooms	23.7%
4 bedrooms	43.0%
5+ bedrooms	30.7%

Vehicles per household

Vehicles	% of households
No vehicle	1.1%
1 vehicle	6.0%
2 vehicles	43.3%
3 or more	49.5%

Heating fuel

Fuel type	%
Utility gas	33.3%
Electricity	56.3%
Propane / LP gas	2.4%
Fuel oil	5.0%
Wood	1.7%
Solar	0.4%

Households & families

Household type	Count	%
Married-couple family	1,940	82.6%
Cohabiting couple	67	2.9%
Male householder, no spouse	150	6.4%
Female householder, no spouse	192	8.2%
Households with children under 18	984	41.9%
Households with seniors (65+)	953	40.6%
Average household size	3.31

Marital status

Status	Male	Female
Never married	27.5%	18.7%
Married	65.9%	74.5%
Separated	0.0%	0.0%
Widowed	0.9%	4.4%
Divorced	5.7%	2.4%

Education

Less than 9th grade 0.5%

Some HS, no diploma 0.9%

HS graduate 15.9%

Some college, no degree 20.0%

Associate's degree 6.7%

Bachelor's degree 34.1%

Graduate / professional 22.0%

Metric	%
HS diploma or higher	98.6%
Bachelor's or higher	56.1%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	257	12.3%
Kindergarten	113	5.4%
Elementary school	705	33.6%
High school	425	20.3%
College / grad school	596	28.4%

Employment

Industry of employment

Professional & management 20.9%

Education & healthcare 16.7%

Public administration 11.8%

Arts, food & hospitality 10.4%

Retail trade 9.0%

Construction 6.9%

Finance & real estate 6.4%

Manufacturing 4.4%

Other services 4.1%

Information 2.9%

Agriculture & mining 2.8%

Transportation & utilities 2.1%

Wholesale trade 1.6%

Occupation

Category	%
Management, business & arts	53.7%
Service	10.8%
Sales & office	20.7%
Natural resources & construction	9.0%
Production & transportation	5.7%

Employment type

Type	%
Private sector	68.6%
Government	25.6%
Self-employed	5.8%
Unpaid family workers	0.0%

Commute

Method	%
Drive alone	73.6%
Carpool	4.4%
Public transit	0.0%
Walk	0.0%
Other means	0.0%
Avg commute (minutes)	36.2

Poverty

All people 0.0%

Under 18 years 0.0%

18 and over 0.0%

Married-couple families 0.0%

Female-led households 0.0%

Income support

Source	% of households
Social Security	32.4%
Retirement income	34.4%
Supplemental Security	3.6%
Cash public assistance	1.3%
Food stamps / SNAP	1.2%

Health indicators

Condition	%
High blood pressure	29.9%
High cholesterol	35.8%
Heart disease	4.9%
Stroke	2.1%
Asthma	9.3%
Arthritis	21.9%
Kidney disease	2.2%
Pulmonary disease	4.8%
Cancer	6.7%

Behavior / access	%
Binge drinking	17.3%
No physical activity	16.6%
Less than 7 hrs sleep	29.5%
Fair or poor health	8.7%
Poor mental health	12.6%
Poor physical health	7.1%
No health insurance	7.4%
Visited doctor (checkup)	75.5%
Visited dentist	74.1%
Cholesterol screening	93.5%
Teeth loss	6.6%

Veterans & disability

Veterans	Count	%
Civilian veterans	544	8.9%

Disability	%
Any disability	10.2%
Under 18	2.9%
18–64 years	3.7%
65 and over	39.4%

Health insurance coverage

Type	%
Private insurance	93.4%
Public insurance	20.8%
Uninsured under 19	0.0%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	7,536	96.8%
Spanish	131	1.7%
Other Indo-European	9	0.1%
Asian & Pacific Islander	63	0.8%
Other languages	59	0.8%

Place of birth & citizenship

Origin	Count	%
Native born (US)	6,771	87.0%
Born in same state	6,739	86.6%
Born in different state	3,103	39.9%
Foreign born	32	0.4%
Naturalized citizen	1,015	13.0%
Not a US citizen	721	71.0%

Ancestry

Ancestry	Count	%
French	1,577	20.3%
Italian	1,323	17%
Arab	387	5%
Polish	302	3.9%
Irish	102	1.3%

Ancestry	Count	%
English	64	0.8%
Dutch	34	0.4%
German	26	0.3%
Norwegian	19	0.2%

Technology access

Metric	% of households
Computer access	30.2%
Internet access	98.9%

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

Frequently asked questions

What ZIP codes does Monrovia, MD have?

Monrovia, MD has one ZIP code: 21770. Each ZIP code serves a distinct delivery area within the city and surrounding region.