21158 ZIP Code — Westminster, MD

Carroll County, Maryland

ZIP code 21158 is located in Westminster, Maryland, within Carroll County. It covers approximately 73.32 square miles and serves a population of 23,011 residents. This is a standard ZIP code in the Eastern (ET) timezone, served by area code 443/410/667.

About ZIP code 21158

The housing stock consists of predominantly single-family detached homes. Most homes were built in the 1980s, giving the area an established character. Median home value is $358,500. Owner-occupancy is high at 79%, well above the national average.

Median household income is $109,076. The poverty rate of 4% is below the national average. 34% of households receive Social Security income, suggesting a notable retiree or disability population.

The dominant occupation class is management, business, and professional, with education and healthcare as the leading industry. An above-average commute of 37 minutes suggests many residents work outside the immediate area.

Educational attainment is near the national average, with 35% of residents holding a bachelor's degree or higher.

Overall, ZIP code 21158 reflects a community defined by high homeownership and a significant Social Security-dependent population.

23,011

population

73.32

sq mi land

Standard

ZIP type

Eastern (ET)

timezone

21158 ZIP code map

Cities in ZIP code 21158

Below are the cities the US Postal Service accepts for ZIP code 21158. Using any city not on this list may result in mail delivery delays.

City	Status
Westminster	Preferred

Nearby ZIP codes

21157 Westminster (5.8 mi) 21787 Taneytown (8.1 mi) 21776 New Windsor (9.3 mi) 21074 Hampstead (9.3 mi) 17340 Littlestown (10.1 mi) 21102 Manchester (10.4 mi) 21791 Union Bridge (11.2 mi) 17331 Hanover (11.3 mi) 17333 Hanover (11.6 mi) 17334 Hanover (11.6 mi) 17332 Hanover (11.6 mi) 21048 Finksburg (11.7 mi)

Demographics updated 05/2026

Population
Total population	23,011
Population density	314 / sq mi
State FIPS	24
County FIPS	013

Geography
Land area	73.32 sq mi
Water area	0.22 sq mi
Latitude	39.6355
Longitude	-77.0256
Timezone	Eastern (ET)
Area code	443/410/667

Total population by age

Gender

Race & ethnicity

Economics updated 05/2026

Household income

Income range	This ZIP	County avg	State avg
Under $50k	23.2%	23.8%	28.2%
$50k – $100k	31.8%	26.3%	28.2%
$100k – $200k	37.5%	37.1%	30.1%
Over $200k	7.5%	12.8%	13.4%

Demographics & statistics

23,011

Population

314

People per sq mi

42.1

Median age

$109,076

Median household income

$48,367

Per capita income

$358,500

Median home value

$1,697

Median monthly rent

78.5%

Home ownership

4.1%

Poverty rate

2.4%

Unemployment

7,020

Housing units

35.0%

Bachelor's or higher

Age distribution

Male Female

618

Under 5

595

691

5–9

665

752

10–14

724

802

15–19

772

611

20–24

588

1,285

25–34

1,237

1,481

35–44

1,426

1,719

45–54

1,655

619

55–59

596

900

60–64

867

1,281

65–74

1,233

625

75–84

601

340

85+

328

← Male

Female →

Age summary

Group	Count	%
Under 18	5,071	22.0%
18 and over	17,940	78.0%
65 and over	4,408	19.2%
Median age	42.1 years

Race & ethnicity

White 88.4%

Two or more races 4.6%

Asian 2.3%

Hispanic or Latino 2%

Black or African American 1.8%

Other race 1%

Group	Count	%
White	20,751	88.4%
Two or more races	1,075	4.6%
Asian	541	2.3%
Hispanic or Latino	468	2%
Black or African American	411	1.8%
Other race	233	1%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	23.2%	23.8%	28.2%
$50k – $100k	31.8%	26.3%	28.2%
$100k – $200k	37.5%	37.1%	30.1%
Over $200k	7.5%	12.8%	13.4%

Under $10k 1.6%

$10k–$15k 1.0%

$15k–$25k 4.7%

$25k–$35k 3.1%

$35k–$50k 6.7%

$50k–$75k 15.7%

$75k–$100k 12.8%

$100k–$150k 22.5%

$150k–$200k 15.8%

$200k+ 16.1%

Range	% of households
Under $10k	1.6%
$10k–$15k	1.0%
$15k–$25k	4.7%
$25k–$35k	3.1%
$35k–$50k	6.7%
$50k–$75k	15.7%
$75k–$100k	12.8%
$100k–$150k	22.5%
$150k–$200k	15.8%
$200k+	16.1%
Median income	$109,076

Housing

Home values

Under $50k 2.7%

$100k–$150k 1.6%

$150k–$200k 7.1%

$200k–$300k 22.7%

$300k–$500k 44.9%

$500k–$1M 20.0%

$1M+ 1.0%

Housing overview

Metric	Value
Median home value	$358,500
Median rent / month	$1,697
Owner occupied	78.5%
Renter occupied	21.5%
Vacant	3.5%
Single-family detached	72.0%
Large apartment buildings	5.1%
Mobile homes	0.0%
Median rooms	7.0
Avg household size (owned)	2.81

Year built

Era	%
2020 or later	0.0%
2010–2019	4.5%
2000–2009	13.3%
1990–1999	22.5%
1980–1989	22.6%
1970–1979	14.8%
1960–1969	5.3%
1950–1959	4.5%
1940–1949	1.5%
1939 or earlier	11.2%

Bedrooms

Size	% of units
No bedroom (studio)	0.6%
1 bedroom	3.2%
2 bedrooms	16.0%
3 bedrooms	44.8%
4 bedrooms	29.7%
5+ bedrooms	5.8%

Vehicles per household

Vehicles	% of households
No vehicle	3.3%
1 vehicle	22.4%
2 vehicles	41.7%
3 or more	32.7%

Heating fuel

Fuel type	%
Utility gas	16.8%
Electricity	51.0%
Propane / LP gas	6.3%
Fuel oil	14.3%
Wood	9.2%
Solar	1.2%
No fuel used	0.6%

Households & families

Household type	Count	%
Married-couple family	5,201	60.8%
Cohabiting couple	709	8.3%
Male householder, no spouse	1,189	13.9%
Female householder, no spouse	1,449	17.0%
Households with children under 18	2,935	34.3%
Households with seniors (65+)	2,940	34.4%
Average household size	2.68

Marital status

Status	Male	Female
Never married	29.0%	23.5%
Married	59.4%	57.6%
Separated	1.1%	0.4%
Widowed	4.5%	8.4%
Divorced	6.0%	10.1%

Education

Less than 9th grade 0.9%

Some HS, no diploma 5.2%

HS graduate 29.4%

Some college, no degree 19.9%

Associate's degree 9.6%

Bachelor's degree 23.4%

Graduate / professional 11.6%

Metric	%
HS diploma or higher	93.9%
Bachelor's or higher	35.0%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	352	6.5%
Kindergarten	272	5.0%
Elementary school	2,153	39.7%
High school	1,404	25.9%
College / grad school	1,245	22.9%

Employment

Industry of employment

Education & healthcare 25.3%

Construction 11.1%

Retail trade 10.6%

Professional & management 10.2%

Finance & real estate 7.9%

Manufacturing 7.3%

Arts, food & hospitality 6.7%

Public administration 6.1%

Other services 5.7%

Transportation & utilities 4.2%

Wholesale trade 2.0%

Agriculture & mining 1.6%

Information 1.3%

Occupation

Category	%
Management, business & arts	45.2%
Service	13.7%
Sales & office	18.8%
Natural resources & construction	10.9%
Production & transportation	11.5%

Employment type

Type	%
Private sector	74.6%
Government	17.4%
Self-employed	7.9%
Unpaid family workers	0.1%

Commute

Method	%
Drive alone	79.0%
Carpool	5.8%
Public transit	0.0%
Walk	0.4%
Work from home	14.4%
Other means	0.3%
Avg commute (minutes)	36.6

Poverty

All people 4.1%

Under 18 years 3.3%

18 and over 4.4%

Married-couple families 1.4%

Female-led households 3.7%

Income support

Source	% of households
Social Security	34.0%
Retirement income	31.6%
Supplemental Security	2.3%
Cash public assistance	0.6%
Food stamps / SNAP	4.6%

Health indicators

Condition	%
Obesity	30.2%
High blood pressure	32.2%
High cholesterol	34.0%
Diabetes	8.6%
Heart disease	5.5%
Stroke	2.5%
Asthma	9.2%
Arthritis	24.9%
Kidney disease	2.5%
Pulmonary disease	5.6%
Cancer	7.2%

Behavior / access	%
Smoking	14.5%
Binge drinking	16.3%
No physical activity	18.6%
Less than 7 hrs sleep	27.7%
Depression	18.6%
Fair or poor health	10.4%
Poor mental health	13.5%
Poor physical health	8.1%
No health insurance	8.6%
Visited doctor (checkup)	77.0%
Visited dentist	69.3%
Cholesterol screening	92.5%
Teeth loss	9.0%

Veterans & disability

Veterans	Count	%
Civilian veterans	1,375	7.7%

Disability	%
Any disability	14.9%
Under 18	6.2%
18–64 years	12.6%
65 and over	32.1%

Health insurance coverage

Type	%
Private insurance	83.6%
Public insurance	29.2%
No insurance	2.6%
Uninsured under 19	1.2%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	21,798	94.7%
Spanish	358	1.6%
Other Indo-European	239	1.1%
Asian & Pacific Islander	86	0.4%
Other languages	33	0.2%

Place of birth & citizenship

Origin	Count	%
Native born (US)	21,964	95.5%
Born in same state	21,472	93.3%
Born in different state	15,129	65.7%
Foreign born	492	2.1%
Naturalized citizen	1,047	4.5%
Not a US citizen	623	59.5%

Ancestry

Ancestry	Count	%
Arab	3,461	15%
Italian	3,458	15%
French	2,612	11.4%
English	280	1.2%
German	157	0.7%

Ancestry	Count	%
Polish	94	0.4%
Irish	88	0.4%
Norwegian	40	0.2%
Dutch	11	0%

Technology access

Metric	% of households
Computer access	37.1%
Internet access	94.1%

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

Frequently asked questions about ZIP code 21158

What city is ZIP code 21158 in?

ZIP code 21158 is primarily assigned to Westminster, Maryland.

What county is ZIP code 21158 in?

ZIP code 21158 falls within Carroll County, Maryland.

What is the typical home value in ZIP code 21158?

The median home value in ZIP code 21158 is $358,500.

What is the median household income in ZIP code 21158?

The median household income in ZIP code 21158 is $109,076, above the national median of ~$75,000.

What is the population of ZIP code 21158?

ZIP code 21158 has an estimated population of 23,011 residents, with a density of 314 people per square mile.

What timezone is ZIP code 21158 in?

ZIP code 21158 observes the EST timezone.