21111 ZIP Code — Monkton, MD

Baltimore County, Maryland

ZIP code 21111 is located in Monkton, Maryland, within Baltimore County. It covers approximately 35.35 square miles and serves a population of 4,838 residents. This is a standard ZIP code in the Eastern (ET) timezone, served by area code 443/410.

About ZIP code 21111

The housing stock consists of predominantly single-family detached homes. Most homes were built in the 1990s, giving the area an established character. Median home value is $573,600. Owner-occupancy is high at 96%, well above the national average.

The gap between median ($140,966) and mean household income suggests income inequality — a small number of higher earners pull the average up. The poverty rate of 7% is below the national average. 43% of households receive Social Security income, suggesting a notable retiree or disability population.

The dominant occupation class is management, business, and professional, with professional and management as the leading industry. The average commute of 34 minutes is near the national average.

Educational attainment is high — 62% of residents hold a bachelor's degree or higher, well above the national average of 33%.

Overall, ZIP code 21111 reflects a community defined by a highly educated population, high homeownership, and a significant Social Security-dependent population.

4,838

population

35.35

sq mi land

Standard

ZIP type

Eastern (ET)

timezone

21111 ZIP code map

Cities in ZIP code 21111

Below are the cities the US Postal Service accepts for ZIP code 21111. Using any city not on this list may result in mail delivery delays.

City	Status
Monkton	Acceptable
Monkton	Preferred

Nearby ZIP codes

21152 Sparks Glencoe (5.2 mi) 21131 Phoenix (5.4 mi) 21161 White Hall (5.9 mi) 21120 Parkton (6.8 mi) 21013 Baldwin (7.2 mi) 21084 Jarrettsville (7.7 mi) 21047 Fallston (8.7 mi) 21082 Hydes (9.4 mi) 21093 Lutherville Timonium (9.8 mi) 21053 Freeland (9.9 mi) 21057 Glen Arm (10.1 mi) 21051 Fork (10.1 mi)

Demographics updated 05/2026

Population
Total population	4,838
Population density	137 / sq mi
State FIPS	24
County FIPS	005

Geography
Land area	35.35 sq mi
Water area	0.20 sq mi
Latitude	39.5757
Longitude	-76.5937
Timezone	Eastern (ET)
Area code	443/410

Total population by age

Gender

Race & ethnicity

Economics updated 05/2026

Household income

Income range	This ZIP	County avg	State avg
Under $50k	11.1%	31.4%	28.2%
$50k – $100k	24.3%	30.7%	28.2%
$100k – $200k	36.1%	28.5%	30.1%
Over $200k	28.5%	9.5%	13.4%

Demographics & statistics

4,838

Population

137

People per sq mi

49.5

Median age

$140,966

Median household income

$68,488

Per capita income

$573,600

Median home value

Median monthly rent

95.9%

Home ownership

6.9%

Poverty rate

7.5%

Unemployment

1,839

Housing units

61.5%

Bachelor's or higher

Age distribution

Male Female

145

Under 5

130

156

5–9

140

196

10–14

176

120

15–19

107

20–24

114

25–34

102

329

35–44

296

276

45–54

248

264

55–59

238

284

60–64

256

395

65–74

356

165

75–84

149

85+

← Male

Female →

Age summary

Group	Count	%
Under 18	1,142	23.6%
18 and over	3,696	76.4%
65 and over	1,163	24.0%
Median age	49.5 years

Race & ethnicity

White 93.8%

Two or more races 2.8%

Hispanic or Latino 2.3%

Black or African American 0.8%

Other race 0.3%

Group	Count	%
White	4,644	93.8%
Two or more races	137	2.8%
Hispanic or Latino	112	2.3%
Black or African American	41	0.8%
Other race	14	0.3%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	11.1%	31.4%	28.2%
$50k – $100k	24.3%	30.7%	28.2%
$100k – $200k	36.1%	28.5%	30.1%
Over $200k	28.5%	9.5%	13.4%

$10k–$15k 1.6%

$15k–$25k 1.9%

$25k–$35k 6.1%

$35k–$50k 4.0%

$50k–$75k 8.7%

$75k–$100k 17.7%

$100k–$150k 11.8%

$150k–$200k 11.8%

$200k+ 36.3%

Range	% of households
$10k–$15k	1.6%
$15k–$25k	1.9%
$25k–$35k	6.1%
$35k–$50k	4.0%
$50k–$75k	8.7%
$75k–$100k	17.7%
$100k–$150k	11.8%
$150k–$200k	11.8%
$200k+	36.3%
Median income	$140,966

Housing

Home values

Under $50k 0.9%

$50k–$100k 0.8%

$100k–$150k 0.7%

$150k–$200k 0.7%

$200k–$300k 2.9%

$300k–$500k 34.0%

$500k–$1M 51.9%

$1M+ 8.1%

Housing overview

Metric	Value
Median home value	$573,600
Median rent / month	$0
Owner occupied	95.9%
Renter occupied	4.1%
Vacant	3.1%
Single-family detached	96.1%
Large apartment buildings	0.6%
Mobile homes	0.0%
Median rooms	10.0
Avg household size (owned)	2.64

Year built

Era	%
2020 or later	0.0%
2010–2019	2.3%
2000–2009	11.7%
1990–1999	20.5%
1980–1989	19.6%
1970–1979	17.7%
1960–1969	9.1%
1950–1959	3.1%
1940–1949	2.3%
1939 or earlier	13.6%

Bedrooms

Size	% of units
No bedroom (studio)	0.0%
1 bedroom	0.0%
2 bedrooms	12.4%
3 bedrooms	35.3%
4 bedrooms	36.4%
5+ bedrooms	15.8%

Vehicles per household

Vehicles	% of households
No vehicle	0.0%
1 vehicle	13.7%
2 vehicles	37.3%
3 or more	48.9%

Heating fuel

Fuel type	%
Utility gas	2.4%
Electricity	41.2%
Propane / LP gas	14.3%
Fuel oil	36.9%
Wood	2.3%
Solar	0.8%
No fuel used	0.8%

Households & families

Household type	Count	%
Married-couple family	1,187	63.9%
Cohabiting couple	118	6.4%
Male householder, no spouse	257	13.8%
Female householder, no spouse	295	15.9%
Households with children under 18	609	32.8%
Households with seniors (65+)	806	43.4%
Average household size	2.61

Marital status

Status	Male	Female
Never married	17.7%	12.6%
Married	61.6%	66.6%
Separated	1.1%	2.6%
Widowed	6.2%	5.8%
Divorced	13.4%	12.3%

Education

Less than 9th grade 0.4%

Some HS, no diploma 3.3%

HS graduate 10.7%

Some college, no degree 16.9%

Associate's degree 7.2%

Bachelor's degree 31.3%

Graduate / professional 30.1%

Metric	%
HS diploma or higher	96.3%
Bachelor's or higher	61.5%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	24	2.5%
Kindergarten	49	5.2%
Elementary school	574	60.6%
High school	207	21.9%
College / grad school	93	9.8%

Employment

Industry of employment

Professional & management 21.6%

Education & healthcare 17.2%

Construction 13.3%

Manufacturing 9.2%

Retail trade 7.7%

Finance & real estate 7.6%

Arts, food & hospitality 6.5%

Public administration 5.7%

Other services 4.5%

Transportation & utilities 3.8%

Information 1.3%

Wholesale trade 1.2%

Agriculture & mining 0.6%

Occupation

Category	%
Management, business & arts	66.1%
Service	7.5%
Sales & office	15.6%
Natural resources & construction	6.8%
Production & transportation	4.0%

Employment type

Type	%
Private sector	83.3%
Government	12.2%
Self-employed	4.5%
Unpaid family workers	0.0%

Commute

Method	%
Drive alone	76.2%
Carpool	3.7%
Public transit	0.0%
Walk	1.5%
Work from home	18.4%
Other means	0.3%
Avg commute (minutes)	33.8

Poverty

All people 6.9%

Under 18 years 9.2%

18 and over 6.2%

Married-couple families 4.6%

Female-led households 22.8%

Income support

Source	% of households
Social Security	43.1%
Retirement income	37.3%
Supplemental Security	0.0%
Cash public assistance	0.0%
Food stamps / SNAP	1.2%

Health indicators

Condition	%
Obesity	28.0%
High blood pressure	33.1%
High cholesterol	36.0%
Diabetes	8.1%
Heart disease	5.4%
Stroke	2.3%
Asthma	8.9%
Arthritis	25.3%
Kidney disease	2.5%
Pulmonary disease	4.8%
Cancer	8.0%

Behavior / access	%
Smoking	10.8%
Binge drinking	15.3%
No physical activity	16.5%
Less than 7 hrs sleep	28.3%
Depression	18.0%
Fair or poor health	9.1%
Poor mental health	11.9%
Poor physical health	7.1%
No health insurance	6.5%
Visited doctor (checkup)	77.6%
Visited dentist	75.0%
Cholesterol screening	95.1%
Teeth loss	6.2%

Veterans & disability

Veterans	Count	%
Civilian veterans	231	6.3%

Disability	%
Any disability	8.9%
Under 18	4.1%
18–64 years	9.4%
65 and over	12.7%

Health insurance coverage

Type	%
Private insurance	88.3%
Public insurance	31.4%
No insurance	1.2%
Uninsured under 19	0.0%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	4,563	94.3%
Spanish	0	0.0%
Other Indo-European	0	0.0%
Asian & Pacific Islander	0	0.0%
Other languages	0	0.0%

Place of birth & citizenship

Origin	Count	%
Native born (US)	4,686	96.9%
Born in same state	4,660	96.3%
Born in different state	3,157	65.3%
Foreign born	26	0.5%
Naturalized citizen	152	3.1%
Not a US citizen	132	86.8%

Ancestry

Ancestry	Count	%
French	869	18%
Italian	838	17.3%
Arab	473	9.8%
English	231	4.8%

Ancestry	Count	%
Polish	38	0.8%
Norwegian	21	0.4%
Irish	6	0.1%

Technology access

Metric	% of households
Computer access	38.4%
Internet access	98.2%

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

Frequently asked questions about ZIP code 21111

What city is ZIP code 21111 in?

ZIP code 21111 is primarily assigned to Monkton, Maryland.

What county is ZIP code 21111 in?

ZIP code 21111 falls within Baltimore County, Maryland.

Is ZIP code 21111 mostly owner-occupied?

96% of occupied units in ZIP code 21111 are owner-occupied, well above the national average.

How educated is the population of ZIP code 21111?

62% of residents hold a bachelor's degree or higher — well above the national average of ~33%, reflecting a highly educated population.

Does ZIP code 21111 have a large retiree population?

43% of households in ZIP code 21111 receive Social Security income, suggesting a significant retiree or disability population.

What is the median household income in ZIP code 21111?

The median household income in ZIP code 21111 is $140,966, above the national median of ~$75,000.

What timezone is ZIP code 21111 in?

ZIP code 21111 observes the EST timezone.