🇺🇸 United States ZIP Code

STANDARD

01581

Westborough

ZIP Code 01581 is a standard zip code serving Westborough, Westborough, Massachusetts (MA), in Worcester County, United States. It has an estimated population of 18,272 with a median household income of $100,905. The area falls within the America/New_York timezone.

Median Household Income vs. National Average

Location

Country: 🇺🇸 United States
State / Province: Massachusetts (MA)
County: Worcester
City: Westborough
Timezone: America/New_York

Coordinates

Latitude: 42.267900
Longitude: -71.617600

Geographic Details

Land Area: 20.58 mi²
Water Area: 0.86 mi²
Population Density: 888.0 people per mi² (75th percentile)
Bounding Box: 42.305891°N, 42.225959°S, -71.542878°E, -71.676441°W

With 18,272 residents spread across 20.58 square miles, this area has a population density of 888.0 people per square mile.

Demographics

18,272

Population

80th percentile

$100,905

Median Income

95th percentile

$397,300

Median Home Value

90th percentile

20.58 mi²

Land Area

The median household income in 01581 is $100,905, and the median home value is $397,300. This places the area in the top 25% nationally for household income.

Housing

7,350

Total Units

6,924

Occupied Units

94.2%

Occupancy Rate

Similar ZIP Codes in Massachusetts

ZIP codes with similar median household income in Massachusetts.

01590

Sutton

$110,658

02375

South Easton

$86,689

02466

Auburndale

$105,893

02186

Milton

$111,071

02021

Canton

$89,900

01834

Groveland

$97,463

02359

Pembroke

$86,887

01569

Uxbridge

$86,164

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.