21784 ZIP Code — Sykesville, MD

Carroll County, Maryland

ZIP code 21784 is located in Sykesville, Maryland, within Carroll County. It covers approximately 56.13 square miles and serves a population of 37,219 residents. This is a standard ZIP code in the Eastern (ET) timezone, served by area code 443/410.

About ZIP code 21784

The housing stock consists of predominantly single-family detached homes. Most homes were built in the 1970s, giving the area an established character. Median home value is $459,700. Owner-occupancy is high at 87%, well above the national average.

Median household income is $138,923. The poverty rate of 4% is below the national average.

The dominant occupation class is management, business, and professional, with education and healthcare as the leading industry. An above-average commute of 36 minutes suggests many residents work outside the immediate area.

Educational attainment is high — 52% of residents hold a bachelor's degree or higher, well above the national average of 33%.

Overall, ZIP code 21784 reflects a community defined by a highly educated population and high homeownership.

37,219

population

56.13

sq mi land

Standard

ZIP type

Eastern (ET)

timezone

21784 ZIP code map

Cities in ZIP code 21784

Below are the cities the US Postal Service accepts for ZIP code 21784. Using any city not on this list may result in mail delivery delays.

City	Status
Sykesville	Acceptable
Sykesville	Preferred

Nearby ZIP codes

21104 Marriottsville (4.8 mi) 21797 Woodbine (6.5 mi) 21163 Woodstock (6.9 mi) 21794 West Friendship (6.9 mi) 21048 Finksburg (7.5 mi) 21738 Glenwood (8.3 mi) 21133 Randallstown (8.3 mi) 21042 Ellicott City (8.8 mi) 21737 Glenelg (9.5 mi) 21117 Owings Mills (9.6 mi) 21771 Mount Airy (10.2 mi) 21244 Windsor Mill (10.6 mi)

Demographics updated 05/2026

Population
Total population	37,219
Population density	663 / sq mi
State FIPS	24
County FIPS	013

Geography
Land area	56.13 sq mi
Water area	2.03 sq mi
Latitude	39.3924
Longitude	-76.9673
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	16.7%	23.8%	28.2%
$50k – $100k	22.4%	26.3%	28.2%
$100k – $200k	41.1%	37.1%	30.1%
Over $200k	19.8%	12.8%	13.4%

Demographics & statistics

37,219

Population

663

People per sq mi

40.3

Median age

$138,923

Median household income

$56,776

Per capita income

$459,700

Median home value

$1,647

Median monthly rent

87.3%

Home ownership

3.5%

Poverty rate

3.2%

Unemployment

11,866

Housing units

51.9%

Bachelor's or higher

Age distribution

Male Female

1,006

Under 5

1,028

1,206

5–9

1,232

1,271

10–14

1,298

1,283

15–19

1,311

944

20–24

965

1,993

25–34

2,035

2,687

35–44

2,745

2,833

45–54

2,893

1,259

55–59

1,285

1,119

60–64

1,143

1,558

65–74

1,592

842

75–84

860

411

85+

420

← Male

Female →

Age summary

Group	Count	%
Under 18	8,729	23.5%
18 and over	28,490	76.5%
65 and over	5,683	15.3%
Median age	40.3 years

Race & ethnicity

White 79.1%

Black or African American 6.4%

Two or more races 5.6%

Asian 4%

Hispanic or Latino 3.3%

Other race 1.1%

American Indian / Alaska Native 0.5%

Group	Count	%
White	30,439	79.1%
Black or African American	2,460	6.4%
Two or more races	2,161	5.6%
Asian	1,522	4%
Hispanic or Latino	1,274	3.3%
Other race	436	1.1%
American Indian / Alaska Native	184	0.5%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	16.7%	23.8%	28.2%
$50k – $100k	22.4%	26.3%	28.2%
$100k – $200k	41.1%	37.1%	30.1%
Over $200k	19.8%	12.8%	13.4%

Under $10k 2.1%

$10k–$15k 0.8%

$15k–$25k 2.7%

$25k–$35k 3.0%

$35k–$50k 4.7%

$50k–$75k 8.3%

$75k–$100k 10.2%

$100k–$150k 23.0%

$150k–$200k 18.2%

$200k+ 27.0%

Range	% of households
Under $10k	2.1%
$10k–$15k	0.8%
$15k–$25k	2.7%
$25k–$35k	3.0%
$35k–$50k	4.7%
$50k–$75k	8.3%
$75k–$100k	10.2%
$100k–$150k	23.0%
$150k–$200k	18.2%
$200k+	27.0%
Median income	$138,923

Housing

Home values

Under $50k 1.1%

$50k–$100k 0.5%

$100k–$150k 0.6%

$150k–$200k 1.6%

$200k–$300k 8.8%

$300k–$500k 48.2%

$500k–$1M 37.4%

$1M+ 1.7%

Housing overview

Metric	Value
Median home value	$459,700
Median rent / month	$1,647
Owner occupied	87.3%
Renter occupied	12.7%
Vacant	3.5%
Single-family detached	78.7%
Large apartment buildings	3.2%
Mobile homes	0.2%
Median rooms	7.5
Avg household size (owned)	2.87

Year built

Era	%
2020 or later	0.4%
2010–2019	7.5%
2000–2009	12.9%
1990–1999	21.2%
1980–1989	20.2%
1970–1979	22.7%
1960–1969	5.8%
1950–1959	3.9%
1940–1949	1.3%
1939 or earlier	4.0%

Bedrooms

Size	% of units
No bedroom (studio)	0.1%
1 bedroom	4.1%
2 bedrooms	12.8%
3 bedrooms	37.6%
4 bedrooms	34.2%
5+ bedrooms	11.2%

Vehicles per household

Vehicles	% of households
No vehicle	2.4%
1 vehicle	19.4%
2 vehicles	44.7%
3 or more	33.6%

Heating fuel

Fuel type	%
Utility gas	32.7%
Electricity	45.7%
Propane / LP gas	3.7%
Fuel oil	16.0%
Wood	1.0%
Solar	0.6%
No fuel used	0.2%

Households & families

Household type	Count	%
Married-couple family	8,904	68.2%
Cohabiting couple	585	4.5%
Male householder, no spouse	1,244	9.5%
Female householder, no spouse	2,318	17.8%
Households with children under 18	5,125	39.3%
Households with seniors (65+)	3,761	28.8%
Average household size	2.77

Marital status

Status	Male	Female
Never married	28.0%	22.4%
Married	63.3%	59.5%
Separated	0.4%	1.8%
Widowed	2.6%	7.8%
Divorced	5.7%	8.5%

Education

Less than 9th grade 1.5%

Some HS, no diploma 3.7%

HS graduate 18.6%

Some college, no degree 16.4%

Associate's degree 7.9%

Bachelor's degree 30.9%

Graduate / professional 21.0%

Metric	%
HS diploma or higher	94.8%
Bachelor's or higher	51.9%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	821	8.3%
Kindergarten	455	4.6%
Elementary school	3,813	38.6%
High school	2,269	23.0%
College / grad school	2,527	25.6%

Employment

Industry of employment

Education & healthcare 25.7%

Professional & management 16.3%

Public administration 9.7%

Finance & real estate 8.4%

Construction 7.8%

Arts, food & hospitality 7.8%

Retail trade 7.3%

Manufacturing 6.0%

Other services 4.0%

Wholesale trade 2.4%

Transportation & utilities 2.4%

Information 1.7%

Agriculture & mining 0.5%

Occupation

Category	%
Management, business & arts	59.6%
Service	13.5%
Sales & office	15.5%
Natural resources & construction	6.4%
Production & transportation	5.0%

Employment type

Type	%
Private sector	72.1%
Government	22.2%
Self-employed	5.4%
Unpaid family workers	0.3%

Commute

Method	%
Drive alone	74.5%
Carpool	4.4%
Public transit	0.8%
Walk	0.7%
Work from home	19.1%
Other means	0.6%
Avg commute (minutes)	36.3

Poverty

All people 3.5%

Under 18 years 3.9%

18 and over 3.4%

Married-couple families 0.9%

Female-led households 9.7%

Income support

Source	% of households
Social Security	26.8%
Retirement income	26.4%
Supplemental Security	2.1%
Cash public assistance	1.2%
Food stamps / SNAP	2.6%

Health indicators

Condition	%
Obesity	29.4%
High blood pressure	31.0%
High cholesterol	33.7%
Diabetes	8.1%
Heart disease	4.8%
Stroke	2.3%
Asthma	8.9%
Arthritis	23.2%
Kidney disease	2.3%
Pulmonary disease	4.8%
Cancer	6.9%

Behavior / access	%
Smoking	12.5%
Binge drinking	16.3%
No physical activity	16.6%
Less than 7 hrs sleep	27.2%
Depression	17.6%
Fair or poor health	9.2%
Poor mental health	12.5%
Poor physical health	7.3%
No health insurance	7.5%
Visited doctor (checkup)	77.0%
Visited dentist	72.2%
Cholesterol screening	93.3%
Teeth loss	7.4%

Veterans & disability

Veterans	Count	%
Civilian veterans	2,197	7.8%

Disability	%
Any disability	9.5%
Under 18	3.8%
18–64 years	6.4%
65 and over	31.1%

Health insurance coverage

Type	%
Private insurance	89.6%
Public insurance	21.9%
No insurance	2.4%
Uninsured under 19	1.0%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	35,185	94.5%
Spanish	951	2.7%
Other Indo-European	274	0.8%
Asian & Pacific Islander	168	0.5%
Other languages	474	1.3%

Place of birth & citizenship

Origin	Count	%
Native born (US)	35,004	94.0%
Born in same state	34,483	92.6%
Born in different state	23,443	63.0%
Foreign born	521	1.4%
Naturalized citizen	2,215	6.0%
Not a US citizen	1,372	61.9%

Ancestry

Ancestry	Count	%
Italian	6,351	17.1%
French	4,778	12.8%
Arab	3,389	9.1%
Irish	371	1%
English	303	0.8%

Ancestry	Count	%
Norwegian	199	0.5%
German	160	0.4%
Polish	113	0.3%
Dutch	66	0.2%

Technology access

Metric	% of households
Computer access	35.1%
Internet access	96.3%

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

Frequently asked questions about ZIP code 21784

What city is ZIP code 21784 in?

ZIP code 21784 is primarily assigned to Sykesville, Maryland.

What county is ZIP code 21784 in?

ZIP code 21784 falls within Carroll County, Maryland.

Is ZIP code 21784 mostly owner-occupied?

87% of occupied units in ZIP code 21784 are owner-occupied, well above the national average.

How educated is the population of ZIP code 21784?

52% of residents hold a bachelor's degree or higher — well above the national average of ~33%, reflecting a highly educated population.

What is the median household income in ZIP code 21784?

The median household income in ZIP code 21784 is $138,923, above the national median of ~$75,000.

What is the typical home value in ZIP code 21784?

The median home value in ZIP code 21784 is $459,700.

What timezone is ZIP code 21784 in?

ZIP code 21784 observes the EST timezone.