Zip code 40121: Fort Knox, Kentucky

Q: What city is zip code 40121?

40121 is assigned to Fort Knox, Kentucky. The city name is the one the Postal Service prefers for mail addressed to this zip code.

Q: What county is 40121 in?

40121 is mostly in Hardin County, but it extends into 1 other county.

Q: What is the population of 40121?

About 8,836 people live in 40121, according to the Census Bureau's American Community Survey.

Q: What is the median household income in 40121?

The median household income in 40121 is $82,663.

Q: What zip codes are near 40121?

The closest zip codes to 40121 are 40155, 40122, 40177, 40160, 40117.

Residential delivery areaHardin CountyEastern Time

Population

8,836

Median household income

$83K

U.S. $81K

Median home value

—

U.S. $333K

Median rent

$1,502/mo

U.S. $1,413

Median age

U.S. 38.9

Land area

35 sq mi

251 people/sq mi

Boundary is the Census Bureau's ZIP Code Tabulation Area, which closely tracks the postal delivery area.

About 40121

40121 is a small-town zip code in Fort Knox, Kentucky (Hardin County), covering 35 sq mi of land. About 8,836 people live here, or 251 per square mile. The median resident is 24 years old, compared with 38.9 nationally.

The median household earns $82,663 a year, close to the national median of $80,734. 9% of residents live below the poverty line (U.S.: 12.5%). 0% of occupied homes are lived in by their owners, and renters pay a median of $1,502 a month.

48% of adults hold a bachelor's degree or higher (U.S.: 36%). Commuters average 12.4 minutes each way, and 5% of workers work from home. The most common jobs among working residents are in sales; management; and business and finance. 23% of households speak a language other than English at home, most often Spanish.

How 40121 compares

Sorted from highest to lowest national percentile

Unemployment rate15.1%
99th
WeaknessU.S. 5.2% · KY 4.9%46th of 719 in KY
Veterans20.9%
99th
U.S. 6.2% · KY 6.5%14th of 724 in KY
Residents under 1833.5%
99th
U.S. 22% · KY 22.6%51st of 724 in KY
Government workers39.7%
99th
U.S. 14.5% · KY 14.6%32nd of 719 in KY
Broadband access96.6%
90th
StrengthU.S. 91% · KY 88.6%66th of 719 in KY
Diversity index66.8
87th
U.S. 61.4 · KY 32.54th of 724 in KY
Bachelor's degree or higher48.3%
77th
U.S. 35.7% · KY 27.6%32nd of 723 in KY
Housing vacancy10.9%
75th
U.S. 10.1% · KY 10.3%394th of 719 in KY
Tech workers4.2%
71st
U.S. 3.8% · KY 2.2%53rd of 719 in KY
Median gross rent$1,502
56th
U.S. $1,413 · KY $9679th of 467 in KY
Median household income$82,663
53rd
U.S. $80,734 · KY $63,72678th of 641 in KY
Poverty rate9%
38th
U.S. 12.5% · KY 16.1%589th of 722 in KY
Uninsured rate5.4%
37th
U.S. 8.4% · KY 6%312th of 723 in KY
Median earnings per worker$42,810
32nd
U.S. $49,666 · KY $43,552285th of 700 in KY
Foreign-born residents5.3%
31st
U.S. 14.1% · KY 4.7%77th of 724 in KY
Per capita income$32,370
25th
U.S. $44,673 · KY $35,821230th of 722 in KY
Population density251/sq mi
23rd
U.S. 95/sq mi · KY 115/sq mi123rd of 724 in KY
Population8,836
14th
U.S. 334,922,499 · KY 4,534,824144th of 724 in KY
Work from home5%
8th
U.S. 15.1% · KY 10.2%390th of 719 in KY
Income inequality (Gini)0.354
3rd
StrengthU.S. 0.483 · KY 0.477595th of 715 in KY
Rent-burdened renters22.7%
2nd
StrengthU.S. 51.1% · KY 45.4%490th of 634 in KY
Healthcare workers3.9%
2nd
U.S. 9.7% · KY 10.5%577th of 719 in KY
Median age24
1st
U.S. 38.9 · KY 39.1703rd of 724 in KY
Homeownership rate0%
1st
WeaknessU.S. 65.2% · KY 68.3%718th of 719 in KY
Average commute12.4 min
1st
StrengthU.S. 26.4 min · KY 24 min620th of 624 in KY
Residents 65 and older1.8%
1st
U.S. 17.2% · KY 17.3%713th of 724 in KY
Self-employed workers1.4%
1st
U.S. 10% · KY 8.6%586th of 719 in KY

Measure	40121	Hardin	KY	U.S.	National percentile	Rank in KY
Unemployment rateWeakness	15.1%	6.6%	4.9%	5.2%	99th	46th of 719
Veterans	20.9%	15.3%	6.5%	6.2%	99th	14th of 724
Residents under 18	33.5%	24.7%	22.6%	22%	99th	51st of 724
Government workers	39.7%	18.1%	14.6%	14.5%	99th	32nd of 719
Broadband accessStrength	96.6%	90.1%	88.6%	91%	90th	66th of 719
Diversity index	66.8	42.7	32.5	61.4	87th	4th of 724
Bachelor's degree or higher	48.3%	24.8%	27.6%	35.7%	77th	32nd of 723
Housing vacancy	10.9%	7.2%	10.3%	10.1%	75th	394th of 719
Tech workers	4.2%	2.6%	2.2%	3.8%	71st	53rd of 719
Median gross rent	$1,502	$971	$967	$1,413	56th	9th of 467
Median household income	$82,663	$67,647	$63,726	$80,734	53rd	78th of 641
Poverty rate	9%	13.1%	16.1%	12.5%	38th	589th of 722
Uninsured rate	5.4%	5.8%	6%	8.4%	37th	312th of 723
Median earnings per worker	$42,810	$43,828	$43,552	$49,666	32nd	285th of 700
Foreign-born residents	5.3%	4.3%	4.7%	14.1%	31st	77th of 724
Per capita income	$32,370	$37,638	$35,821	$44,673	25th	230th of 722
Population density	251/sq mi	179/sq mi	115/sq mi	95/sq mi	23rd	123rd of 724
Population	8,836	111,942	4,534,824	334,922,499	14th	144th of 724
Work from home	5%	9.2%	10.2%	15.1%	8th	390th of 719
Income inequality (Gini)Strength	0.354	0.464	0.477	0.483	3rd	595th of 715
Rent-burdened rentersStrength	22.7%	36.6%	45.4%	51.1%	2nd	490th of 634
Healthcare workers	3.9%	9.3%	10.5%	9.7%	2nd	577th of 719
Median age	24	37.3	39.1	38.9	1st	703rd of 724
Homeownership rateWeakness	0%	62.6%	68.3%	65.2%	1st	718th of 719
Average commuteStrength	12.4 min	22.4 min	24 min	26.4 min	1st	620th of 624
Residents 65 and older	1.8%	15.1%	17.3%	17.2%	1st	713th of 724
Self-employed workers	1.4%	8.5%	8.6%	10%	1st	586th of 719

The percentile is the share of Americans who live in a zip code with a lower value, so the 50th percentile is typical. Rank 1 is the highest value in the state. Both include zip codes with at least 100 residents. Strengths and weaknesses mark measures in the best or worst fifth nationally, where higher or lower is clearly better (income, poverty, education, commute, broadband, insurance and similar). Measures like age or density are left unmarked.

People

Age

11%

Under 5

22%

5–17

18%

18–24

20%

25–34

20%

35–44

45–54

55–64

65–74

75+

Median age

Under 18

33.5%

65 and over

1.8%

Race and ethnicity

White50%
Black15%
Hispanic23%
Asian3%
Native American0.5%
Pacific Islander1%
Other0%
Multiracial8%

Diversity index

66.8

U.S. 61.4

Foreign-born

5.3%

U.S. 14.1%

Born in state

10.4%

Language spoken at home (households)

English only

77%

Spanish

17%

Other Indo-European

Asian / Pacific

Other

0.9%

Households

Households: 2,226
Average household size: 3.2
Family households: 76.5%
Married couples: 63.2%
Living alone: 21.7%
Veterans (of adults): 20.9%
Male / female: 55% / 45%

Income and poverty

Household income distribution

<$25k

10%

$25–50k

10%

$50–75k

26%

$75–100k

12%

$100–150k

23%

$150–200k

12%

$200k+

Median household income

40121

$82,663

Hardin Co.

$67,647

Kentucky

$63,726

United States

$80,734

Per capita income

$32,370

U.S. $44,673

Poverty rate

U.S. 12.5%

Households earning $150K+

19.5%

U.S. 23%

Income inequality (Gini)

0.354

U.S. 0.483

Housing

Median home value

40121

—

Hardin Co.

$225,800

Kentucky

$205,600

United States

$332,700

Median gross rent

40121

$1,502

Hardin Co.

$971

Kentucky

$967

United States

$1,413

Types of housing

Single-family

70%

2–4 units

14%

5–19 units

20+ units

Mobile home

0.1%

Boat, RV, van

Housing units: 2,497
Owner-occupied: 0%
Vacant: 10.9%
Median year built: 1976
Median rooms: 5.4
Renters paying 30%+ of income: 22.7%
Renters paying 50%+ of income: 9.7%
Home value to income: —

Work and commute

How people get to work

Drove alone

68%

Carpooled

Transit

Walked

21%

Bicycle

0.8%

Worked from home

Other

Commute time (one way)

<10 min

45%

10–19

42%

20–29

30–44

45–59

60+

0.8%

Average commute

12.4 min

U.S. 26.4 min

Unemployment

15.1%

U.S. 5.2%

In labor force

83.3%

U.S. 63.5%

Jobs and careers

What employed residents do, wherever they work

Occupations

Sales

18%

Management

15%

Business and finance

10%

Office and admin

Cleaning and personal care

Food service

Education

Computer and math

Farming, fishing and forestry

Healthcare

Police and fire

Legal and social services

Arts, media and sports

Transportation and moving

Production

Engineering and science

Construction and repair

Industries

Public administration

22%

Retail

15%

Health care and social assistance

13%

Finance, insurance and real estate

12%

Restaurants and hotels

Admin, support and management

Education

Arts and recreation

Agriculture and mining

Manufacturing

Information

Construction

Transportation, warehousing and utilities

Other services

Professional and technical services

Wholesale

Median earnings per worker

$42,810

U.S. $49,666

Self-employed

1.4%

U.S. 10%

Government workers

39.7%

U.S. 14.5%

Nonprofit workers

6.2%

U.S. 8.8%

Median earnings by type of work

Type of work	40121	U.S.
Management, business, science and arts	$56,950	$74,888
Service	$11,465	$26,804
Sales and office	$43,695	$40,476
Construction and maintenance	under $2,500	$49,199
Production and transportation	$27,277	$39,989

Education, internet and health coverage

Highest education (adults 25+)

No diploma

High school

13%

Some college

22%

Associate's

13%

Bachelor's

28%

Graduate

20%

High school graduate or higher: 95.8%
Bachelor's degree or higher: 48.3%
Graduate or professional degree: 19.9%
Households with broadband: 96.6%
Cable, fiber or DSL: 89.2%
No internet access: 1%
Without health insurance: 5.4%
Limited-English households: 1%

Geography

City (USPS): Fort Knox
State: Kentucky
County: Hardin County
Center point: 37.9269° N, 85.9598° W
Land area: 35 sq mi
Water area: 0.1 sq mi
Time zone: Eastern Time (UTC-5, UTC-4 in summer)
Zip type: Residential delivery area

40121 spans 2 counties

Hardin County84% of land
Meade County16% of land

Cities and towns within this zip

Fort Knox (unincorporated)43% of zip

Census places overlapping the zip's area. Mail may use a different city name than the municipality.

Zip codes near 40121

Search by radius

Zip	City	Distance	Population	IncomeMedian income	Home value
40155	Muldraugh, KY	2.4 mi	1,127	$60,508	$76,700
40122	Fort Knox, KY · PO box	2.5 mi	—	—	—
40177	West Point, KY	5.6 mi	1,523	$50,577	$122,200
40160	Radcliff, KY	8 mi	23,624	$58,506	$165,900
40117	Ekron, KY	9.2 mi	2,050	$58,696	$196,700
40175	Vine Grove, KY	10 mi	15,718	$77,509	$223,800
47135	Laconia, IN	11 mi	1,257	$48,611	$216,200
40108	Brandenburg, KY	12 mi	12,821	$77,559	$221,800
40272	Louisville, KY	12 mi	38,289	$69,940	$176,200
47117	Elizabeth, IN	12 mi	4,400	$86,853	$221,700
40162	Rineyville, KY	13 mi	6,180	$84,720	$304,600
40142	Guston, KY	14 mi	2,253	$81,037	$166,100

Questions about 40121

What city is zip code 40121?

40121 is assigned to Fort Knox, Kentucky. The city name is the one the Postal Service prefers for mail addressed to this zip code.

What county is 40121 in?

40121 is mostly in Hardin County, but it extends into 1 other county.

What is the population of 40121?

About 8,836 people live in 40121, according to the Census Bureau's American Community Survey.

What time zone is 40121 in?

40121 is in Eastern Time.

What is the median household income in 40121?

The median household income in 40121 is $82,663.

What zip codes are near 40121?

The closest zip codes to 40121 are 40155, 40122, 40177, 40160, 40117.

Demographic figures are 2020–2024 American Community Survey 5-year estimates for ZIP Code Tabulation Area 40121, from the U.S. Census Bureau. Small areas have wide margins of error. How we build these numbers.