🇺🇸 United States ZIP Code

STANDARD

02128

Boston

ZIP Code 02128 is a standard zip code serving Boston, Boston, Massachusetts (MA), in Suffolk County, United States. It has an estimated population of 40,508 with a median household income of $48,704. The area falls within the America/New_York timezone.

Median Household Income vs. National Average

Location

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

Coordinates

Latitude: 42.364200
Longitude: -71.025700

Geographic Details

Land Area: 4.85 mi²
Water Area: 1.14 mi²
Population Density: 8352.0 people per mi² (95th percentile)
Bounding Box: 42.397398°N, 42.346799°S, -70.986053°E, -71.047381°W

With 40,508 residents spread across 4.85 square miles, this area has a population density of 8352.0 people per square mile.

Demographics

40,508

Population

95th percentile

$48,704

Median Income

50th percentile

$290,200

Median Home Value

85th percentile

4.85 mi²

Land Area

The median household income in 02128 is $48,704, and the median home value is $290,200.

Housing

15,854

Total Units

14,651

Occupied Units

92.4%

Occupancy Rate

Nearby ZIP Codes

Other zip codes in Boston, MA.

02108

Boston

02109

Boston

02110

Boston

02111

Boston

02112

Boston

02113

Boston

02114

Boston

02115

Boston

02116

Boston

02117

Boston

Similar ZIP Codes in Massachusetts

ZIP codes with similar median household income in Massachusetts.

02149

Everett

$49,368

02150

Chelsea

$47,291

02639

Dennis Port

$46,510

01201

Pittsfield

$42,633

01607

Worcester

$45,152

01420

Fitchburg

$45,363

01851

Lowell

$51,630

02111

Boston

$43,551

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.