21012 ZIP Code — Arnold, MD

Anne Arundel County, Maryland

ZIP code 21012 is located in Arnold, Maryland, within Anne Arundel County. It covers approximately 9.78 square miles and serves a population of 23,144 residents. This is a standard ZIP code in the Eastern (ET) timezone, served by area code 410/667.

About ZIP code 21012

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 $516,300. Owner-occupancy is high at 85%, well above the national average.

The gap between median ($136,705) and mean household income suggests income inequality — a small number of higher earners pull the average up. 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. The average commute of 32 minutes is near the national average.

Educational attainment is high — 57% of residents hold a bachelor's degree or higher, well above the national average of 33%.

Notable community characteristics include a notable veteran presence at 12% of civilians, above the national average of 7%.

Overall, ZIP code 21012 reflects a community defined by a highly educated population, a strong veteran community, and high homeownership.

23,144

population

9.78

sq mi land

Standard

ZIP type

Eastern (ET)

timezone

21012 ZIP code map

Cities in ZIP code 21012

Below are the cities the US Postal Service accepts for ZIP code 21012. Using any city not on this list may result in mail delivery delays.

City	Status
Arnold	Preferred

Nearby ZIP codes

21409 Annapolis (2.7 mi) 21405 Annapolis (3.2 mi) 21402 Annapolis (4.1 mi) 21146 Severna Park (4.4 mi) 21401 Annapolis (4.4 mi) 21411 Annapolis (4.5 mi) 21412 Annapolis (4.5 mi) 21122 Pasadena (5.8 mi) 21032 Crownsville (6.1 mi) 21403 Annapolis (7 mi) 21108 Millersville (7.1 mi) 21140 Riva (8.1 mi)

Demographics updated 06/2026

Population
Total population	23,144
Population density	2,366 / sq mi
State FIPS	24
County FIPS	003

Geography
Land area	9.78 sq mi
Water area	2.79 sq mi
Latitude	39.0430
Longitude	-76.4942
Timezone	Eastern (ET)
Area code	410/667

Total population by age

Gender

Race & ethnicity

Economics updated 06/2026

Household income

Income range	This ZIP	County avg	State avg
Under $50k	9.7%	20.1%	28.2%
$50k – $100k	25.6%	27.4%	28.2%
$100k – $200k	45.8%	36.3%	30.1%
Over $200k	18.9%	16.2%	13.4%

Demographics & statistics

23,144

Population

2,366

People per sq mi

38.4

Median age

$136,705

Median household income

$58,888

Per capita income

$516,300

Median home value

$2,091

Median monthly rent

84.9%

Home ownership

3.6%

Poverty rate

3.5%

Unemployment

7,310

Housing units

57.0%

Bachelor's or higher

Age distribution

Male Female

619

Under 5

637

908

5–9

935

875

10–14

902

892

15–19

918

588

20–24

605

1,044

25–34

1,075

1,748

35–44

1,801

1,480

45–54

1,525

841

55–59

866

655

60–64

674

1,017

65–74

1,047

564

75–84

581

171

85+

176

← Male

Female →

Age summary

Group	Count	%
Under 18	6,066	26.2%
18 and over	17,078	73.8%
65 and over	3,556	15.4%
Median age	38.4 years

Race & ethnicity

White 78.5%

Two or more races 8.3%

Black or African American 5%

Hispanic or Latino 3.8%

Asian 3.5%

Other race 0.8%

American Indian / Alaska Native 0.1%

Group	Count	%
White	18,888	78.5%
Two or more races	1,998	8.3%
Black or African American	1,191	5%
Hispanic or Latino	915	3.8%
Asian	846	3.5%
Other race	189	0.8%
American Indian / Alaska Native	32	0.1%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	9.7%	20.1%	28.2%
$50k – $100k	25.6%	27.4%	28.2%
$100k – $200k	45.8%	36.3%	30.1%
Over $200k	18.9%	16.2%	13.4%

Under $10k 1.7%

$10k–$15k 0.7%

$15k–$25k 1.5%

$25k–$35k 2.3%

$35k–$50k 3.8%

$50k–$75k 7.5%

$75k–$100k 13.2%

$100k–$150k 26.1%

$150k–$200k 16.1%

$200k+ 27.1%

Range	% of households
Under $10k	1.7%
$10k–$15k	0.7%
$15k–$25k	1.5%
$25k–$35k	2.3%
$35k–$50k	3.8%
$50k–$75k	7.5%
$75k–$100k	13.2%
$100k–$150k	26.1%
$150k–$200k	16.1%
$200k+	27.1%
Median income	$136,705

Housing

Home values

Under $50k 0.9%

$50k–$100k 0.5%

$100k–$150k 0.7%

$150k–$200k 0.6%

$200k–$300k 5.2%

$300k–$500k 40.0%

$500k–$1M 44.1%

$1M+ 8.1%

Housing overview

Metric	Value
Median home value	$516,300
Median rent / month	$2,091
Owner occupied	84.9%
Renter occupied	15.1%
Vacant	4.7%
Single-family detached	71.6%
Large apartment buildings	1.2%
Mobile homes	0.4%
Median rooms	7.5
Avg household size (owned)	2.80

Year built

Era	%
2020 or later	0.0%
2010–2019	4.9%
2000–2009	3.1%
1990–1999	15.0%
1980–1989	26.7%
1970–1979	28.4%
1960–1969	7.9%
1950–1959	8.3%
1940–1949	2.8%
1939 or earlier	2.7%

Bedrooms

Size	% of units
No bedroom (studio)	0.4%
1 bedroom	1.8%
2 bedrooms	11.7%
3 bedrooms	33.5%
4 bedrooms	41.3%
5+ bedrooms	11.1%

Vehicles per household

Vehicles	% of households
No vehicle	0.9%
1 vehicle	24.5%
2 vehicles	43.8%
3 or more	30.8%

Heating fuel

Fuel type	%
Utility gas	35.0%
Electricity	52.3%
Propane / LP gas	3.0%
Fuel oil	7.7%
Wood	0.6%
Solar	0.4%
No fuel used	0.7%

Households & families

Household type	Count	%
Married-couple family	5,144	63.2%
Cohabiting couple	433	5.3%
Male householder, no spouse	957	11.8%
Female householder, no spouse	1,610	19.8%
Households with children under 18	3,267	40.1%
Households with seniors (65+)	2,385	29.3%
Average household size	2.82

Marital status

Status	Male	Female
Never married	27.3%	25.3%
Married	62.0%	57.6%
Separated	2.9%	1.7%
Widowed	1.6%	5.0%
Divorced	6.2%	10.4%

Education

Less than 9th grade 0.9%

Some HS, no diploma 1.3%

HS graduate 11.3%

Some college, no degree 20.1%

Associate's degree 9.2%

Bachelor's degree 32.3%

Graduate / professional 24.7%

Metric	%
HS diploma or higher	97.7%
Bachelor's or higher	57.0%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	441	6.3%
Kindergarten	274	3.9%
Elementary school	3,070	44.1%
High school	1,592	22.9%
College / grad school	1,588	22.8%

Employment

Industry of employment

Education & healthcare 21.2%

Professional & management 19.5%

Public administration 12.0%

Arts, food & hospitality 9.5%

Retail trade 7.5%

Finance & real estate 6.5%

Construction 5.8%

Wholesale trade 4.7%

Other services 4.3%

Manufacturing 4.0%

Transportation & utilities 3.0%

Information 1.6%

Agriculture & mining 0.2%

Occupation

Category	%
Management, business & arts	57.8%
Service	13.1%
Sales & office	17.1%
Natural resources & construction	5.4%
Production & transportation	6.6%

Employment type

Type	%
Private sector	69.9%
Government	24.4%
Self-employed	5.2%
Unpaid family workers	0.4%

Commute

Method	%
Drive alone	72.9%
Carpool	5.3%
Public transit	0.7%
Walk	0.4%
Work from home	19.3%
Other means	1.4%
Avg commute (minutes)	32.0

Poverty

All people 3.6%

Under 18 years 3.9%

18 and over 3.4%

Married-couple families 1.5%

Female-led households 9.5%

Income support

Source	% of households
Social Security	27.4%
Retirement income	31.4%
Supplemental Security	2.7%
Cash public assistance	1.1%
Food stamps / SNAP	3.4%

Health indicators

Condition	%
Obesity	29.7%
High blood pressure	30.6%
High cholesterol	33.0%
Diabetes	7.7%
Heart disease	4.9%
Stroke	2.1%
Asthma	8.6%
Arthritis	22.7%
Kidney disease	2.2%
Pulmonary disease	4.3%
Cancer	6.8%

Behavior / access	%
Smoking	10.3%
Binge drinking	16.9%
No physical activity	15.5%
Less than 7 hrs sleep	30.5%
Depression	18.6%
Fair or poor health	8.2%
Poor mental health	12.2%
Poor physical health	7.2%
No health insurance	6.7%
Visited doctor (checkup)	76.0%
Visited dentist	76.2%
Cholesterol screening	94.0%
Teeth loss	5.8%

Veterans & disability

Veterans	Count	%
Civilian veterans	2,085	12.4%

Disability	%
Any disability	9.5%
Under 18	4.9%
18–64 years	7.5%
65 and over	24.8%

Health insurance coverage

Type	%
Private insurance	87.7%
Public insurance	24.8%
No insurance	1.8%
Uninsured under 19	0.5%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	21,888	94.6%
Spanish	471	2.2%
Other Indo-European	197	0.9%
Asian & Pacific Islander	106	0.5%
Other languages	168	0.8%

Place of birth & citizenship

Origin	Count	%
Native born (US)	21,367	92.3%
Born in same state	20,812	89.9%
Born in different state	12,389	53.5%
Foreign born	555	2.4%
Naturalized citizen	1,777	7.7%
Not a US citizen	1,118	62.9%

Ancestry

Ancestry	Count	%
Italian	3,049	13.2%
French	2,696	11.6%
Arab	789	3.4%
English	118	0.5%
Irish	114	0.5%

Ancestry	Count	%
Polish	103	0.4%
Norwegian	82	0.4%
German	51	0.2%
Dutch	12	0.1%

Technology access

Metric	% of households
Computer access	35.2%
Internet access	98.5%

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

Frequently asked questions about ZIP code 21012

What city is ZIP code 21012 in?

ZIP code 21012 is primarily assigned to Arnold, Maryland.

What county is ZIP code 21012 in?

ZIP code 21012 falls within Anne Arundel County, Maryland.

How educated is the population of ZIP code 21012?

57% of residents hold a bachelor's degree or higher — well above the national average of ~33%, reflecting a highly educated population.

Is ZIP code 21012 mostly owner-occupied?

85% of occupied units in ZIP code 21012 are owner-occupied, well above the national average.

Does ZIP code 21012 have a large veteran population?

12% of civilians in ZIP code 21012 are veterans, above the national average of ~7%.

What is the median household income in ZIP code 21012?

The median household income in ZIP code 21012 is $136,705, above the national median of ~$75,000.

What timezone is ZIP code 21012 in?

ZIP code 21012 observes the EST timezone.