Residential delivery area · Tennessee
ZIP Code 37921: Knoxville, TN
ZIP code 37921 is in Knoxville, Tennessee, entirely in Knox County (Census 2020 ZIP-county file). About 29,000 people live there (Census Bureau, ACS 2020-2024), the 7th most populous of Knoxville's 19 residential ZIP codes. Median household income is $60,013 (Census Bureau, ACS 2020-2024). By Census place, 78% of its land lies in Knoxville; 22% is outside any Census place.
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- Knoxville · 19 residential ZIPs
- County
- Knox County
- Census places
- Knoxville
- Neighborhood
- Deep Creek GeoNames
- Metro area
- Knoxville, TN
- House district
- TN-2 119th Congress
- State
- Tennessee
- Time zone
- Eastern
- Land area
- 15.9 sq mi · 1,806 people per sq mi
- PO Box ZIPs
- 12 more ZIP codes use the name Knoxville for PO boxes or single organizations
Where is ZIP code 37921?
37921 centers on 35.978°, -84.002° and covers 15.9 square miles of land plus 0.0 of water. It borders 9 ZIP codes: 37912, 37909, 37916, 37919, 37902, 37917, 37923, 37849, 37931.
The map draws ZIP code areas only. For the streets inside 37921, open its center on OpenStreetMap.
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries and the 2023 Gazetteer (2020 ZCTAs); ZIP-to-county shares, Census places and House districts (119th Congress) from the Census 2020 relationship files (shares of land); metro area from the OMB delineation (July 2023); town name and time zone from simplemaps US ZIP Codes (CC BY 4.0); neighborhoods from the GeoNames gazetteer (CC BY 4.0), placed in this ZIP code by PlainZIP.
How does 37921 compare with the rest of Knoxville?
| Measure | 37921 | In Knoxville | In Knox County | In TN |
|---|---|---|---|---|
| People (ACS 2020-2024) | 28,717 | 7th of 19 | 8th of 28 | 75th of 636 |
| Median household income | $60k | 12th of 15 | 19th of 23 | 247th of 425 |
| Median home value | $226k | 12th of 16 | 16th of 24 | 227th of 436 |
Its median household income is higher than in 29% of U.S. residential ZIP codes, and it is denser than 84% of all U.S. residential ZIP codes. ZIP codes at the ACS caps ($250,000 or more for household income, $2,000,000 or more for home value) share the top rank.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B19013, B25077); ranks by PlainZIP over residential ZIP codes (ZCTAs).
How many people live in 37921?
The 2020 Census counted 28,903 people in 37921; the ACS, which samples households over 2020-2024, estimates 28,717. Between the 2010 and 2020 censuses its population grew 2.4% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 28,717
- 2020 Census count
- 28,903+2.4% since 2010 (28,233)
- Households
- 11,634
- Median age
- 34.6
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B01002, B11001); 2020 Census (DHC P1); 2010 Census (SF1 P1).
Who lives in 37921?
Of the 28,717 people the ACS estimates in 37921, 23.3% are under 18 and 12.9% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (63.8%), then Black (not Hispanic) (20.1%).
- Under 1823.3%
- 18 to 6463.7%
- 65 and older12.9%
- White, not Hispanic63.8%
- Black, not Hispanic20.1%
- Hispanic or Latino10.4%
- Other or two or more4.8%
- Asian, not Hispanic0.9%
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01001 age by sex, B03002 Hispanic or Latino origin by race); shares of the estimated population, small ZIP codes carry wide margins.
What do households in 37921 earn?
Median household income is $60,013 (ACS 2020-2024), the 19th highest of the 23 ranked ZIP codes in Knox County. It is not measurably different from 2015-2019 ($59,486 in 2024 dollars): the change is within the surveys' margins of error.
- Median household income
- $60,013
- Income per person
- $30,928
- Below the poverty line
- 17.2%
- Unemployed (of the labor force)
- 3.9%
- Adults 25+ with a bachelor's degree
- 26.3%
- Adjusted gross income per tax return, 2022
- $52,80913,050 returns; wages 80% of AGI (IRS)
Source: U.S. Census Bureau, ACS 2020-2024 and 2015-2019 5-year estimates (B19013, B19301, B17001, B23025, B15003; 2015-2019 dollars converted with the BLS CPI-U, 1.22699); IRS Statistics of Income, ZIP code data, tax year 2022 (adjusted gross income per return, filed under the address on the return).
What are homes worth in 37921?
FHFA's house price index for 37921, built from repeat sales and appraisals of the same homes, rose 170% from 2015 to 2025 and rose 89% from 2020 to 2025, and moved +3.4% in 2025.
- Median home value (owners' estimate)
- $226,300
- Median gross rent
- $1,233
- Homes owned by their occupants
- 59.8%
- Housing units
- 12,957
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B25077, B25064, B25003, B25001); FHFA House Price Index, annual five-digit ZIP, updated 2026-03-31.
What businesses are in 37921?
703 business establishments had a location in this ZIP code in 2023, 29 more than in 2018; the most are in wholesale trade (ZIP Code Business Patterns).
- Wholesale trade100
- Retail trade94
- Construction79
- Manufacturing60
- Other services (except public administration)55
- Health care and social assistance51
Source: U.S. Census Bureau, ZIP Code Business Patterns 2023 and 2018 (establishments with paid employees, by the business's ZIP code).
Which ZIP codes are next to 37921?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 37912 | Knoxville | 21,505 | $47k | 2.3 mi |
| 37909 | Knoxville | 16,774 | $67k | 2.4 mi |
| 37916 | Knoxville | 15,583 | $15k | 4.2 mi |
| 37919 | Knoxville | 31,754 | $73k | 4.4 mi |
| 37902 | Knoxville | 2,412 | $50k | 4.7 mi |
| 37917 | Knoxville | 24,615 | $54k | 5.2 mi |
| 37923 | Knoxville | 30,131 | $74k | 5.6 mi |
| 37849 | Powell | 29,375 | $84k | 5.8 mi |
| 37931 | Knoxville | 31,842 | $92k | 7.0 mi |
| 37929 | Knoxville | 0 | – | 4.9 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.