19966 ZIP Code — Millsboro, DE

Sussex County, Delaware

ZIP code 19966 is located in Millsboro, Delaware, within Sussex County. It covers approximately 89.08 square miles and serves a population of 32,513 residents. This is a standard ZIP code in the Eastern (ET) timezone, served by area code 302.

About ZIP code 19966

The housing stock consists of a higher-than-average concentration of mobile homes. Most homes were built in the 2000s, giving the area an established character. Median home value is $247,700. Owner-occupancy is high at 83%, well above the national average.

Median household income is $71,577. 50% 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 30 minutes is near the national average.

Educational attainment is near the national average, with 26% of residents holding a bachelor's degree or higher.

Overall, ZIP code 19966 reflects a community defined by high homeownership and a significant Social Security-dependent population.

32,513

population

89.08

sq mi land

Standard

ZIP type

Eastern (ET)

timezone

19966 ZIP code map

Cities in ZIP code 19966

Below are the cities the US Postal Service accepts for ZIP code 19966. Using any city not on this list may result in mail delivery delays.

City	Status
Millsboro	Acceptable
Millsboro	Preferred

Nearby ZIP codes

19939 Dagsboro (2.3 mi) 19945 Frankford (4 mi) 19967 Millville (7.4 mi) 19975 Selbyville (7.7 mi) 19970 Ocean View (8.2 mi) 19951 Harbeson (8.9 mi) 19930 Bethany Beach (9.7 mi) 21813 Bishopville (10.6 mi) 19947 Georgetown (10.6 mi) 21872 Whaleyville (10.7 mi) 19971 Rehoboth Beach (11.4 mi) 19944 Fenwick Island (11.8 mi)

Demographics updated 05/2026

Population
Total population	32,513
Population density	365 / sq mi
State FIPS	10
County FIPS	005

Geography
Land area	89.08 sq mi
Water area	8.24 sq mi
Latitude	38.5608
Longitude	-75.2492
Timezone	Eastern (ET)
Area code	302

Total population by age

Gender

Race & ethnicity

Economics updated 05/2026

Household income

Income range	This ZIP	County avg	State avg
Under $50k	41.2%	38.6%	36.1%
$50k – $100k	32.0%	32.5%	31.6%
$100k – $200k	22.2%	22.6%	24.7%
Over $200k	4.6%	6.3%	7.6%

Demographics & statistics

32,513

Population

365

People per sq mi

53.4

Median age

$71,577

Median household income

$39,975

Per capita income

$247,700

Median home value

$1,201

Median monthly rent

82.9%

Home ownership

10.9%

Poverty rate

7.0%

Unemployment

16,538

Housing units

26.1%

Bachelor's or higher

Age distribution

Male Female

691

Under 5

763

674

5–9

744

709

10–14

784

819

15–19

904

787

20–24

870

1,325

25–34

1,465

1,318

35–44

1,456

1,703

45–54

1,882

1,335

55–59

1,475

1,168

60–64

1,291

3,284

65–74

3,629

1,364

75–84

1,507

269

85+

297

← Male

Female →

Age summary

Group	Count	%
Under 18	5,407	16.6%
18 and over	27,106	83.4%
65 and over	10,350	31.8%
Median age	53.4 years

Race & ethnicity

White 72.3%

Black or African American 8.7%

Hispanic or Latino 6.5%

Two or more races 5.5%

Other race 4.4%

Asian 1.4%

American Indian / Alaska Native 1.3%

Group	Count	%
White	25,136	72.3%
Black or African American	3,022	8.7%
Hispanic or Latino	2,247	6.5%
Two or more races	1,905	5.5%
Other race	1,518	4.4%
Asian	475	1.4%
American Indian / Alaska Native	457	1.3%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	41.2%	38.6%	36.1%
$50k – $100k	32.0%	32.5%	31.6%
$100k – $200k	22.2%	22.6%	24.7%
Over $200k	4.6%	6.3%	7.6%

Under $10k 2.7%

$10k–$15k 4.8%

$15k–$25k 6.4%

$25k–$35k 6.9%

$35k–$50k 14.5%

$50k–$75k 18.3%

$75k–$100k 14.5%

$100k–$150k 18.6%

$150k–$200k 6.1%

$200k+ 7.1%

Range	% of households
Under $10k	2.7%
$10k–$15k	4.8%
$15k–$25k	6.4%
$25k–$35k	6.9%
$35k–$50k	14.5%
$50k–$75k	18.3%
$75k–$100k	14.5%
$100k–$150k	18.6%
$150k–$200k	6.1%
$200k+	7.1%
Median income	$71,577

Housing

Home values

Under $50k 10.8%

$50k–$100k 7.8%

$100k–$150k 5.3%

$150k–$200k 11.4%

$200k–$300k 24.6%

$300k–$500k 28.4%

$500k–$1M 10.5%

$1M+ 1.3%

Housing overview

Metric	Value
Median home value	$247,700
Median rent / month	$1,201
Owner occupied	82.9%
Renter occupied	17.1%
Vacant	24.9%
Single-family detached	50.1%
Large apartment buildings	1.1%
Mobile homes	32.1%
Median rooms	5.9
Avg household size (owned)	2.15

Year built

Era	%
2020 or later	1.8%
2010–2019	22.1%
2000–2009	32.8%
1990–1999	14.8%
1980–1989	14.1%
1970–1979	5.9%
1960–1969	3.3%
1950–1959	3.0%
1940–1949	0.7%
1939 or earlier	1.6%

Bedrooms

Size	% of units
No bedroom (studio)	0.4%
1 bedroom	2.1%
2 bedrooms	17.9%
3 bedrooms	63.0%
4 bedrooms	14.4%
5+ bedrooms	2.2%

Vehicles per household

Vehicles	% of households
No vehicle	3.1%
1 vehicle	34.6%
2 vehicles	42.5%
3 or more	19.8%

Heating fuel

Fuel type	%
Utility gas	16.4%
Electricity	45.1%
Propane / LP gas	29.6%
Fuel oil	6.2%
Wood	0.5%
Solar	0.3%
No fuel used	0.9%

Households & families

Household type	Count	%
Married-couple family	7,454	52.3%
Cohabiting couple	685	4.8%
Male householder, no spouse	2,188	15.4%
Female householder, no spouse	3,916	27.5%
Households with children under 18	3,315	23.3%
Households with seniors (65+)	6,902	48.5%
Average household size	2.26

Marital status

Status	Male	Female
Never married	23.0%	24.9%
Married	61.4%	50.6%
Separated	1.2%	1.2%
Widowed	4.0%	12.1%
Divorced	10.4%	11.1%

Education

Less than 9th grade 3.4%

Some HS, no diploma 5.1%

HS graduate 35.1%

Some college, no degree 20.8%

Associate's degree 9.6%

Bachelor's degree 14.7%

Graduate / professional 11.4%

Metric	%
HS diploma or higher	91.6%
Bachelor's or higher	26.1%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	391	6.8%
Kindergarten	156	2.7%
Elementary school	2,463	42.8%
High school	1,352	23.5%
College / grad school	1,397	24.3%

Employment

Industry of employment

Education & healthcare 24.8%

Retail trade 14.9%

Professional & management 11.9%

Arts, food & hospitality 10.3%

Construction 8.9%

Finance & real estate 6.1%

Manufacturing 5.8%

Other services 4.9%

Public administration 4.3%

Transportation & utilities 3.8%

Agriculture & mining 2.5%

Information 1.0%

Wholesale trade 0.7%

Occupation

Category	%
Management, business & arts	34.4%
Service	23.5%
Sales & office	23.0%
Natural resources & construction	9.8%
Production & transportation	9.3%

Employment type

Type	%
Private sector	79.4%
Government	15.1%
Self-employed	5.4%
Unpaid family workers	0.0%

Commute

Method	%
Drive alone	81.5%
Carpool	7.6%
Public transit	0.2%
Walk	1.3%
Work from home	8.2%
Other means	1.2%
Avg commute (minutes)	29.7

Poverty

All people 10.9%

Under 18 years 20.7%

18 and over 8.9%

Married-couple families 2.9%

Female-led households 15.6%

Income support

Source	% of households
Social Security	49.9%
Retirement income	37.8%
Supplemental Security	3.0%
Cash public assistance	1.9%
Food stamps / SNAP	8.9%

Health indicators

Condition	%
Obesity	38.2%
High blood pressure	40.4%
High cholesterol	40.1%
Diabetes	12.8%
Heart disease	9.0%
Stroke	4.0%
Asthma	9.7%
Arthritis	29.6%
Kidney disease	3.7%
Pulmonary disease	9.7%
Cancer	8.8%

Behavior / access	%
Smoking	17.3%
Binge drinking	12.1%
No physical activity	29.2%
Less than 7 hrs sleep	31.0%
Depression	16.6%
Fair or poor health	16.5%
Poor mental health	13.1%
Poor physical health	11.8%
No health insurance	16.3%
Visited doctor (checkup)	79.2%
Visited dentist	55.4%
Cholesterol screening	91.4%
Teeth loss	15.4%

Veterans & disability

Veterans	Count	%
Civilian veterans	2,838	10.5%

Disability	%
Any disability	15.4%
Under 18	6.0%
18–64 years	12.8%
65 and over	24.8%

Health insurance coverage

Type	%
Private insurance	68.7%
Public insurance	51.2%
No insurance	7.7%
Uninsured under 19	4.3%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	31,059	95.5%
Spanish	1,386	4.5%
Other Indo-European	1,019	3.3%
Asian & Pacific Islander	61	0.2%
Other languages	199	0.6%

Place of birth & citizenship

Origin	Count	%
Native born (US)	30,393	93.5%
Born in same state	30,230	93.0%
Born in different state	12,230	37.6%
Foreign born	163	0.5%
Naturalized citizen	2,120	6.5%
Not a US citizen	875	41.3%

Ancestry

Ancestry	Count	%
Italian	6,326	19.5%
French	4,730	14.5%
Arab	1,376	4.2%
English	343	1.1%
German	284	0.9%

Ancestry	Count	%
Polish	249	0.8%
Irish	157	0.5%
Norwegian	102	0.3%
Dutch	50	0.2%

Technology access

Metric	% of households
Computer access	43.8%
Internet access	93.5%

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

Frequently asked questions about ZIP code 19966

What city is ZIP code 19966 in?

ZIP code 19966 is primarily assigned to Millsboro, Delaware.

What county is ZIP code 19966 in?

ZIP code 19966 falls within Sussex County, Delaware.

Does ZIP code 19966 have an older population?

32% of residents in ZIP code 19966 are 65 or older, above the national average of ~17%.

Does ZIP code 19966 have a large retiree population?

50% of households in ZIP code 19966 receive Social Security income, suggesting a significant retiree or disability population.

Is ZIP code 19966 mostly owner-occupied?

83% of occupied units in ZIP code 19966 are owner-occupied, well above the national average.

Does ZIP code 19966 have a large veteran population?

11% of civilians in ZIP code 19966 are veterans, above the national average of ~7%.

What timezone is ZIP code 19966 in?

ZIP code 19966 observes the EST timezone.