🇺🇸 United States ZIP Code

STANDARD

37921

Knoxville

ZIP Code 37921 is a standard zip code serving Knoxville, Knoxville, Tennessee (TN), in Knox County, United States. It has an estimated population of 28,233 with a median household income of $39,157. The area falls within the America/New_York timezone.

Median Household Income vs. National Average

Location

Country: 🇺🇸 United States
State / Province: Tennessee (TN)
County: Knox
City: Knoxville
Timezone: America/New_York

Coordinates

Latitude: 35.979300
Longitude: -84.003000

Geographic Details

Land Area: 15.30 mi²
Water Area: 0.01 mi²
Population Density: 1846.0 people per mi² (80th percentile)
Bounding Box: 36.016491°N, 35.956308°S, -83.924950°E, -84.061974°W

With 28,233 residents spread across 15.30 square miles, this area has a population density of 1846.0 people per square mile.

Demographics

28,233

Population

85th percentile

$39,157

Median Income

25th percentile

$114,700

Median Home Value

40th percentile

15.30 mi²

Land Area

The median household income in 37921 is $39,157, and the median home value is $114,700. This is below the national average for household income.

Housing

12,639

Total Units

11,295

Occupied Units

89.4%

Occupancy Rate

Nearby ZIP Codes

Other zip codes in Knoxville, TN.

37901

Knoxville

37902

Knoxville

37909

Knoxville

37912

Knoxville

37914

Knoxville

37915

Knoxville

37916

Knoxville

37917

Knoxville

37918

Knoxville

37919

Knoxville

Similar ZIP Codes in Tennessee

ZIP codes with similar median household income in Tennessee.

38464

Lawrenceburg

$36,276

37317

Copperhill

$42,612

37055

Dickson

$42,430

38478

Pulaski

$35,737

37863

Pigeon Forge

$34,280

37642

Church Hill

$40,561

38260

Troy

$44,226

37701

Alcoa

$40,587

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.