🇺🇸 United States ZIP Code

STANDARD

37138

Old Hickory

ZIP Code 37138 is a standard zip code serving Old Hickory, Old Hickory, Tennessee (TN), in Davidson County, United States. It has an estimated population of 22,191 with a median household income of $56,504. The area falls within the America/Chicago timezone.

Median Household Income vs. National Average

Location

Country: 🇺🇸 United States
State / Province: Tennessee (TN)
County: Davidson
City: Old Hickory
Timezone: America/Chicago

Coordinates

Latitude: 36.241600
Longitude: -86.611700

Geographic Details

Land Area: 17.75 mi²
Water Area: 3.35 mi²
Population Density: 1250.0 people per mi² (80th percentile)
Bounding Box: 36.301064°N, 36.198441°S, -86.545616°E, -86.687155°W

With 22,191 residents spread across 17.75 square miles, this area has a population density of 1250.0 people per square mile.

Demographics

22,191

Population

80th percentile

$56,504

Median Income

65th percentile

$165,900

Median Home Value

65th percentile

17.75 mi²

Land Area

The median household income in 37138 is $56,504, and the median home value is $165,900.

Housing

9,482

Total Units

8,866

Occupied Units

93.5%

Occupancy Rate

Similar ZIP Codes in Tennessee

ZIP codes with similar median household income in Tennessee.

37073

Greenbrier

$53,943

38060

Oakland

$60,656

37072

Goodlettsville

$53,138

37804

Maryville

$48,295

37742

Greenback

$49,976

38558

Crossville

$49,984

37803

Maryville

$49,748

37849

Powell

$53,762

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.