🇺🇸 United States ZIP Code

STANDARD

02121

Dorchester

ZIP Code 02121 is a standard zip code serving Dorchester, Dorchester, Massachusetts (MA), in Suffolk County, United States. It has an estimated population of 25,978 with a median household income of $28,238. 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: Dorchester
Timezone: America/New_York

Coordinates

Latitude: 42.297300
Longitude: -71.074500

Geographic Details

Land Area: 1.75 mi²
Water Area: 0.01 mi²
Population Density: 14884.0 people per mi² (95th percentile)
Bounding Box: 42.319213°N, 42.291973°S, -71.069471°E, -71.101932°W

With 25,978 residents spread across 1.75 square miles, this area has a population density of 14884.0 people per square mile.

Demographics

25,978

Population

85th percentile

$28,238

Median Income

5th percentile

$311,700

Median Home Value

85th percentile

1.75 mi²

Land Area

The median household income in 02121 is $28,238, and the median home value is $311,700. This is below the national average for household income.

Housing

10,589

Total Units

9,661

Occupied Units

91.2%

Occupancy Rate

Nearby ZIP Codes

Other zip codes in Dorchester, MA.

02122

Dorchester

02125

Dorchester

Similar ZIP Codes in Massachusetts

ZIP codes with similar median household income in Massachusetts.

02724

Fall River

$27,390

02721

Fall River

$30,180

01151

Indian Orchard

$30,043

01610

Worcester

$30,532

01104

Springfield

$32,273

02115

Boston

$27,134

01901

Lynn

$23,467

02723

Fall River

$28,120

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.