🇺🇸 United States ZIP Code

STANDARD

19966

Millsboro

ZIP Code 19966 is a standard zip code serving Millsboro, Millsboro, Delaware (DE), in Sussex County, United States. It has an estimated population of 24,601 with a median household income of $51,581. The area falls within the America/New_York timezone.

Median Household Income vs. National Average

Location

Country: 🇺🇸 United States
State / Province: Delaware (DE)
County: Sussex
City: Millsboro
Timezone: America/New_York

Coordinates

Latitude: 38.659500
Longitude: -75.246400

Geographic Details

Land Area: 86.58 mi²
Water Area: 8.27 mi²
Population Density: 284.0 people per mi² (65th percentile)
Bounding Box: 38.673636°N, 38.452028°S, -75.085163°E, -75.433192°W

With 24,601 residents spread across 86.58 square miles, this area has a population density of 284.0 people per square mile.

Demographics

24,601

Population

85th percentile

$51,581

Median Income

55th percentile

$182,300

Median Home Value

70th percentile

86.58 mi²

Land Area

The median household income in 19966 is $51,581, and the median home value is $182,300.

Housing

16,163

Total Units

10,425

Occupied Units

64.5%

Occupancy Rate

Similar ZIP Codes in Delaware

ZIP codes with similar median household income in Delaware.

19933

Bridgeville

$49,935

19941

Ellendale

$46,582

19963

Milford

$52,766

19975

Selbyville

$53,023

19952

Harrington

$47,951

19958

Lewes

$54,938

19939

Dagsboro

$56,289

19973

Seaford

$45,600

Frequently Asked Questions

What information is available for each ZIP code?

Each ZIP code page shows city, state, county, geographic coordinates, timezone, population, median household income, median home value, housing units, land area, population density, commute time, educational attainment, area codes, and ZIP code type (Standard, PO Box, or Unique).

What are the different types of ZIP codes?

There are three types of ZIP codes: Standard (residential and commercial delivery areas), PO Box (assigned to post office box sections), and Unique (assigned to a single high-volume address like a government agency or large company). Standard ZIP codes are the most common.

How often is ZIP code data updated?

ZIP code assignments are updated quarterly by the USPS. Demographic data comes from the US Census Bureau's American Community Survey (ACS), which releases new 5-year estimates annually. ZipFYI updates its data to reflect the latest available information.

What is population density and why does it matter?

Population density measures the number of people per square mile in a ZIP code area. It helps identify urban vs. rural areas, affects real estate values, impacts service availability, and is used in market analysis. Dense urban ZIP codes may have 50,000+ people per square mile.

How are ZIP code boundaries determined?

ZIP code boundaries are determined by the USPS based on mail delivery routes, not political or geographic boundaries. They follow carrier routes and may cross city, county, or even state lines. Boundaries can change when the USPS reorganizes delivery operations.

What does median household income tell me about a ZIP code?

Median household income is the middle value when all household incomes in a ZIP code are sorted. Half of households earn more and half earn less. It is a better indicator of typical earnings than average income, which can be skewed by very high or very low outliers.