🇺🇸 United States ZIP Code

STANDARD

17584

Willow Street

ZIP Code 17584 is a standard zip code serving Willow Street, Willow Street, Pennsylvania (PA), in Lancaster County, United States. It has an estimated population of 8,957 with a median household income of $65,369. The area falls within the America/New_York timezone.

Median Household Income vs. National Average

Location

Country: 🇺🇸 United States
State / Province: Pennsylvania (PA)
County: Lancaster
City: Willow Street
Timezone: America/New_York

Coordinates

Latitude: 39.967000
Longitude: -76.275200

Geographic Details

Land Area: 14.51 mi²
Water Area: 0.13 mi²
Population Density: 617.0 people per mi² (70th percentile)
Bounding Box: 40.013933°N, 39.919872°S, -76.208203°E, -76.305191°W

With 8,957 residents spread across 14.51 square miles, this area has a population density of 617.0 people per square mile.

Demographics

8,957

Population

65th percentile

$65,369

Median Income

80th percentile

$196,400

Median Home Value

70th percentile

14.51 mi²

Land Area

The median household income in 17584 is $65,369, and the median home value is $196,400. This places the area in the top 25% nationally for household income.

Housing

3,859

Total Units

3,659

Occupied Units

94.8%

Occupancy Rate

Similar ZIP Codes in Pennsylvania

ZIP codes with similar median household income in Pennsylvania.

17024

Elliottsburg

$61,250

16059

Valencia

$64,160

15931

Ebensburg

$59,147

17252

Saint Thomas

$55,805

18055

Hellertown

$61,265

17026

Fredericksburg

$61,250

17040

Landisburg

$60,078

17324

Gardners

$59,384

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.