🇺🇸 United States ZIP Code

STANDARD

03809

Alton

ZIP Code 03809 is a standard zip code serving Alton, Alton, New Hampshire (NH), in Belknap County, United States. It has an estimated population of 3,716 with a median household income of $63,202. The area falls within the America/New_York timezone.

Median Household Income vs. National Average

Location

Country: 🇺🇸 United States
State / Province: New Hampshire (NH)
County: Belknap
City: Alton
Timezone: America/New_York

Coordinates

Latitude: 43.463000
Longitude: -71.229700

Geographic Details

Land Area: 40.32 mi²
Water Area: 1.01 mi²
Population Density: 92.0 people per mi² (50th percentile)
Bounding Box: 43.558910°N, 43.355860°S, -71.160134°E, -71.288497°W

With 3,716 residents spread across 40.32 square miles, this area has a population density of 92.0 people per square mile.

Demographics

3,716

Population

50th percentile

$63,202

Median Income

75th percentile

$261,700

Median Home Value

80th percentile

40.32 mi²

Land Area

The median household income in 03809 is $63,202, and the median home value is $261,700. This places the area in the top 25% nationally for household income.

Housing

2,026

Total Units

1,471

Occupied Units

72.6%

Occupancy Rate

Similar ZIP Codes in New Hampshire

ZIP codes with similar median household income in New Hampshire.

03801

Portsmouth

$65,355

03820

Dover

$57,401

03276

Tilton

$58,449

03285

Thornton

$59,191

03440

Antrim

$64,224

03045

Goffstown

$69,387

03257

New London

$72,159

03244

Hillsborough

$55,683

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.