21034 ZIP Code — Darlington, MD

Harford County, Maryland

ZIP code 21034 is located in Darlington, Maryland, within Harford County. It covers approximately 26.67 square miles and serves a population of 2,958 residents. This is a standard ZIP code in the Eastern (ET) timezone, served by area code 443/667/410.

About ZIP code 21034

The housing stock consists of predominantly single-family detached homes. Most homes were built in the pre-1940, giving the area an established character. Median home value is $348,000. Owner-occupancy is high at 93%, well above the national average.

Median household income is $85,833. 41% 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. The average commute of 34 minutes is near the national average.

Educational attainment is near the national average, with 29% of residents holding a bachelor's degree or higher.

Overall, ZIP code 21034 reflects a community defined by high homeownership and a significant Social Security-dependent population.

2,958

population

26.67

sq mi land

Standard

ZIP type

Eastern (ET)

timezone

21034 ZIP code map

Cities in ZIP code 21034

Below are the cities the US Postal Service accepts for ZIP code 21034. Using any city not on this list may result in mail delivery delays.

City	Status
Darlington	Preferred

Nearby ZIP codes

21918 Conowingo (3.2 mi) 21028 Churchville (5.7 mi) 21917 Colora (6.2 mi) 21160 Whiteford (6.5 mi) 21078 Havre De Grace (7.2 mi) 21904 Port Deposit (7.8 mi) 21015 Bel Air (8.1 mi) 17563 Peach Bottom (8.4 mi) 21154 Street (8.7 mi) 21911 Rising Sun (9 mi) 17314 Delta (10.2 mi) 21001 Aberdeen (10.4 mi)

Demographics updated 05/2026

Population
Total population	2,958
Population density	111 / sq mi
State FIPS	24
County FIPS	025

Geography
Land area	26.67 sq mi
Water area	2.83 sq mi
Latitude	39.6479
Longitude	-76.2145
Timezone	Eastern (ET)
Area code	443/667/410

Total population by age

Gender

Race & ethnicity

Economics updated 05/2026

Household income

Income range	This ZIP	County avg	State avg
Under $50k	35.8%	25.4%	28.2%
$50k – $100k	24.1%	28.0%	28.2%
$100k – $200k	32.9%	34.2%	30.1%
Over $200k	7.2%	12.4%	13.4%

Demographics & statistics

2,958

Population

111

People per sq mi

51.8

Median age

$85,833

Median household income

$44,165

Per capita income

$348,000

Median home value

$1,442

Median monthly rent

92.9%

Home ownership

15.9%

Poverty rate

1.2%

Unemployment

1,161

Housing units

29.3%

Bachelor's or higher

Age distribution

Male Female

Under 5

5–9

106

10–14

15–19

20–24

163

25–34

149

117

35–44

107

242

45–54

222

185

55–59

170

147

60–64

135

181

65–74

166

75–84

85+

← Male

Female →

Age summary

Group	Count	%
Under 18	564	19.1%
18 and over	2,394	80.9%
65 and over	629	21.3%
Median age	51.8 years

Race & ethnicity

White 93.2%

Two or more races 4.1%

Hispanic or Latino 1.6%

Black or African American 0.7%

Asian 0.2%

American Indian / Alaska Native 0.2%

Other race 0.1%

Group	Count	%
White	2,802	93.2%
Two or more races	124	4.1%
Hispanic or Latino	49	1.6%
Black or African American	20	0.7%
Asian	5	0.2%
American Indian / Alaska Native	5	0.2%
Other race	2	0.1%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	35.8%	25.4%	28.2%
$50k – $100k	24.1%	28.0%	28.2%
$100k – $200k	32.9%	34.2%	30.1%
Over $200k	7.2%	12.4%	13.4%

Under $10k 4.8%

$10k–$15k 3.2%

$15k–$25k 5.9%

$25k–$35k 9.1%

$35k–$50k 6.4%

$50k–$75k 16.8%

$75k–$100k 7.1%

$100k–$150k 22.6%

$150k–$200k 14.2%

$200k+ 10.0%

Range	% of households
Under $10k	4.8%
$10k–$15k	3.2%
$15k–$25k	5.9%
$25k–$35k	9.1%
$35k–$50k	6.4%
$50k–$75k	16.8%
$75k–$100k	7.1%
$100k–$150k	22.6%
$150k–$200k	14.2%
$200k+	10.0%
Median income	$85,833

Housing

Home values

Under $50k 8.1%

$50k–$100k 4.6%

$100k–$150k 3.1%

$150k–$200k 8.9%

$200k–$300k 16.6%

$300k–$500k 35.1%

$500k–$1M 16.7%

$1M+ 6.9%

Housing overview

Metric	Value
Median home value	$348,000
Median rent / month	$1,442
Owner occupied	92.9%
Renter occupied	7.1%
Vacant	3.4%
Single-family detached	77.0%
Large apartment buildings	0.0%
Mobile homes	15.6%
Median rooms	6.9
Avg household size (owned)	2.46

Year built

Era	%
2020 or later	1.0%
2010–2019	1.8%
2000–2009	18.9%
1990–1999	6.4%
1980–1989	12.3%
1970–1979	11.0%
1960–1969	12.1%
1950–1959	8.2%
1940–1949	4.5%
1939 or earlier	23.8%

Bedrooms

Size	% of units
No bedroom (studio)	0.0%
1 bedroom	4.1%
2 bedrooms	17.4%
3 bedrooms	49.2%
4 bedrooms	25.3%
5+ bedrooms	4.0%

Vehicles per household

Vehicles	% of households
No vehicle	3.2%
1 vehicle	16.9%
2 vehicles	39.7%
3 or more	40.2%

Heating fuel

Fuel type	%
Utility gas	6.2%
Electricity	22.3%
Propane / LP gas	18.9%
Fuel oil	37.1%
Wood	14.0%

Households & families

Household type	Count	%
Married-couple family	783	65.0%
Cohabiting couple	38	3.2%
Male householder, no spouse	182	15.1%
Female householder, no spouse	201	16.7%
Households with children under 18	288	23.9%
Households with seniors (65+)	456	37.9%
Average household size	2.45

Marital status

Status	Male	Female
Never married	22.8%	12.1%
Married	65.7%	65.0%
Separated	0.8%	1.1%
Widowed	3.3%	15.9%
Divorced	7.3%	5.9%

Education

Less than 9th grade 5.0%

Some HS, no diploma 5.7%

HS graduate 38.3%

Some college, no degree 16.8%

Associate's degree 4.8%

Bachelor's degree 13.5%

Graduate / professional 15.8%

Metric	%
HS diploma or higher	89.2%
Bachelor's or higher	29.3%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	44	8.2%
Kindergarten	39	7.3%
Elementary school	289	53.8%
High school	115	21.4%
College / grad school	50	9.3%

Employment

Industry of employment

Education & healthcare 19.2%

Construction 16.6%

Public administration 13.2%

Professional & management 12.7%

Manufacturing 9.0%

Other services 8.1%

Retail trade 6.6%

Transportation & utilities 6.5%

Arts, food & hospitality 3.3%

Agriculture & mining 2.0%

Finance & real estate 2.0%

Wholesale trade 0.7%

Occupation

Category	%
Management, business & arts	41.8%
Service	13.5%
Sales & office	14.3%
Natural resources & construction	19.1%
Production & transportation	11.2%

Employment type

Type	%
Private sector	66.8%
Government	25.9%
Self-employed	7.3%
Unpaid family workers	0.0%

Commute

Method	%
Drive alone	74.1%
Carpool	13.7%
Public transit	0.0%
Walk	1.2%
Work from home	10.1%
Other means	0.9%
Avg commute (minutes)	33.8

Poverty

All people 15.9%

Under 18 years 37.0%

18 and over 11.1%

Married-couple families 7.5%

Female-led households 52.2%

Income support

Source	% of households
Social Security	41.4%
Retirement income	32.4%
Supplemental Security	4.6%
Cash public assistance	3.0%
Food stamps / SNAP	7.2%

Health indicators

Condition	%
Obesity	34.8%
High blood pressure	39.7%
High cholesterol	37.3%
Diabetes	11.6%
Heart disease	7.8%
Stroke	3.6%
Asthma	10.4%
Arthritis	28.5%
Kidney disease	3.3%
Pulmonary disease	8.6%
Cancer	7.6%

Behavior / access	%
Smoking	18.9%
Binge drinking	14.2%
No physical activity	24.6%
Less than 7 hrs sleep	32.5%
Depression	20.1%
Fair or poor health	15.5%
Poor mental health	14.6%
Poor physical health	10.9%
No health insurance	10.6%
Visited doctor (checkup)	78.6%
Visited dentist	62.1%
Cholesterol screening	91.6%
Teeth loss	13.9%

Veterans & disability

Veterans	Count	%
Civilian veterans	208	8.7%

Disability	%
Any disability	20.9%
Under 18	3.9%
18–64 years	18.0%
65 and over	44.4%

Health insurance coverage

Type	%
Private insurance	73.6%
Public insurance	43.0%
No insurance	5.2%
Uninsured under 19	5.2%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	2,812	95.1%
Spanish	13	0.5%
Other Indo-European	8	0.3%
Asian & Pacific Islander	0	0.0%
Other languages	5	0.2%

Place of birth & citizenship

Origin	Count	%
Native born (US)	2,947	99.6%
Born in same state	2,919	98.7%
Born in different state	2,128	71.9%
Foreign born	28	0.9%
Naturalized citizen	11	0.4%
Not a US citizen	0	0.0%

Ancestry

Ancestry	Count	%
Italian	514	17.4%
French	471	15.9%
Arab	192	6.5%
English	72	2.4%

Ancestry	Count	%
Norwegian	38	1.3%
Irish	18	0.6%
Polish	5	0.2%
German	3	0.1%

Technology access

Metric	% of households
Computer access	40.7%
Internet access	91.4%

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

Frequently asked questions about ZIP code 21034

What city is ZIP code 21034 in?

ZIP code 21034 is primarily assigned to Darlington, Maryland.

What county is ZIP code 21034 in?

ZIP code 21034 falls within Harford County, Maryland.

Is ZIP code 21034 mostly owner-occupied?

93% of occupied units in ZIP code 21034 are owner-occupied, well above the national average.

What is the poverty rate in ZIP code 21034?

16% of residents in ZIP code 21034 live below the poverty line, above the national average.

Does ZIP code 21034 have a large retiree population?

41% of households in ZIP code 21034 receive Social Security income, suggesting a significant retiree or disability population.

What is the typical home value in ZIP code 21034?

The median home value in ZIP code 21034 is $348,000.

What timezone is ZIP code 21034 in?

ZIP code 21034 observes the EST timezone.