🇺🇸 United States ZIP Code

STANDARD

85321

Ajo

ZIP Code 85321 is a standard zip code serving Ajo, Ajo, Arizona (AZ), in Pima County, United States. It has an estimated population of 4,435 with a median household income of $28,053. The area falls within the America/Phoenix timezone.

Median Household Income vs. National Average

Location

Country: 🇺🇸 United States
State / Province: Arizona (AZ)
County: Pima
City: Ajo
Timezone: America/Phoenix

Coordinates

Latitude: 32.229500
Longitude: -112.654200

Geographic Details

Land Area: 1540.01 mi²
Water Area: 0.28 mi²
Population Density: 3.0 people per mi² (5th percentile)
Bounding Box: 32.637849°N, 31.757436°S, -112.179629°E, -113.085228°W

With 4,435 residents spread across 1540.01 square miles, this area has a population density of 3.0 people per square mile.

Demographics

4,435

Population

55th percentile

$28,053

Median Income

5th percentile

$90,100

Median Home Value

25th percentile

1540.01 mi²

Land Area

The median household income in 85321 is $28,053, and the median home value is $90,100. This is below the national average for household income.

Housing

2,731

Total Units

1,871

Occupied Units

68.5%

Occupancy Rate

Similar ZIP Codes in Arizona

ZIP codes with similar median household income in Arizona.

85035

Phoenix

$31,645

86042

Polacca

$29,500

85705

Tucson

$23,769

86023

Grand Canyon

$26,771

85706

Tucson

$29,814

86333

Mayer

$29,851

85542

Peridot

$30,673

85530

Bylas

$23,214

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.