Fort Knox, KY · standard
ZIP Code 40121
Hardin County, Kentucky - Census ACS demographics, housing tenure, and business patterns, benchmarked against every US ZIP.
- 10,124
- 115/sq mi
- $82,663
- Median income
- 48.3%
- Bachelor's or higher
The verdict
Fort Knox pairs an above-median household income, in a rural, renter-heavy area.
- Top 35%
- household income, US ZIPs
- 115
- people per sq mi
- 0%
- owner-occupied homes
Source: U.S. Census Bureau ACS 5-Year Estimates (2019–2023). Percentiles rank ZIP 40121 against every reporting US ZIP.
ZIP code 40121 is a mid-sized community (a standard USPS delivery area) in Fort Knox, Hardin County, Kentucky, home to 10,124 residents across 87.7 square miles, a density of 115 people per square mile, in the New York time zone.
ZIP 40121 lands in the middle-income range, with a median household income of $82,663 (39% above the Kentucky average), while per-capita income is $32,370. Poverty here runs at 9.0%, with unemployment measured at 5.3%. The typical home here is valued at -; renters pay a median of $1,502 monthly, and 0.0% of units are owner-occupied.
A solid share of residents have a four-year degree: 48.3% of adults hold a bachelor's degree or higher, the median age is 24, and the average commute is 12 minutes. We also surface 5 nearby ZIP codes within roughly 10 miles and 6 additional ZIPs sharing Hardin County, so you can benchmark 40121 against its immediate geography rather than a national average alone.
Every figure on this page is sourced from the U.S. Census Bureau American Community Survey 5-Year Estimates (including median rent) and the FHFA House Price Index, no estimates, no proprietary scoring. Verify with Census →
Top industries in ZIP 40121
Top 5 sectors by establishment count in Fort Knox, KY
Which industries have the most business establishments in ZIP 40121.
- Professional, scientific, and technical services
Professional, scientific, and technical services
14 establishments
- Administrative and support and waste management and remediation services
Administrative and support and waste management and remediation services
9 establishments
- Accommodation and food services
Accommodation and food services
6 establishments
- Other services (except public administration)
Other services (except public administration)
6 establishments
- Retail trade 5
Retail trade
5 establishments
What this shows Establishment counts come from the Census ZIP Code Business Patterns program, which counts physical business locations rather than employees or revenue.
Source: U.S. Census Bureau, American Community Survey 5-Year Estimates + ZIP Code Business Patterns + FHFA HPI ACS demographics and median rent, ZBP business establishments, FHFA HPI for ZIP 40121, Fort Knox, KY · 2023 Census ACS 5-Year Estimates use a rolling 60-month sample for stable small-geography estimates; ZBP updated annually; FHFA HPI updated quarterly/annually.
Quick Facts
10,124
Population
87.7
Area (sq mi)
115
People / sq mi
New York
Time Zone
standard
ZIP Type
Who lives in ZIP 40121?
24.0
Median Age
54.6%
Male
45.4%
Female
5.3%
Foreign-Born
Hispanic or Latino is an ethnicity category from the Census Bureau and may overlap with other categories above.
Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)
How much do residents earn?
$82,663
Median Household Income
+39% vs state
$32,370
Per Capita Income
9.0%
Poverty Rate
5.3%
Unemployment Rate
12.4 min
Mean Commute Time
How ZIP 40121 ranks nationally
Fort Knox, KY household income vs. every US ZIP code
Median household income, the full national distribution, with this ZIP marked
$82,663 Top 35% higher than 65% of 30,318 US ZIPs
Each bar is a $20K-wide band; taller bars hold more US ZIPs. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
Source U.S. Census Bureau, ACS 5-Year Estimates · 2019–2023
Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)
What is the education profile here?
Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)
What does housing look like?
2,497
Total Housing Units
2,226
Occupied Units
271
Vacant Units
3.22
Avg Household Size
Occupancy Type
$1,502
Median Rent
1976
Median Year Built
Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)
What businesses operate in this ZIP?
Census Bureau data shows 55 business establishments in ZIP 40121, employing approximately 1,015 people with a combined annual payroll of $55,488,000.
55
Businesses
1,015
Employees
$55.5M
Annual Payroll
7
Industry Sectors
| Industry | Establishments | % of Total |
|---|---|---|
| Professional, scientific, and technical services | 14 | 25.4% |
| Administrative and support and waste management and remediation services | 9 | 16.4% |
| Accommodation and food services | 6 | 10.9% |
| Other services (except public administration) | 6 | 10.9% |
| Retail trade | 5 | 9.1% |
| Finance and insurance | 4 | 7.3% |
| Health care and social assistance | 4 | 7.3% |
Source: U.S. Census Bureau, ZIP Code Business Patterns (ZBP), 2023. Employment figures may include noise for disclosure avoidance.
Nearby ZIP Codes
Want a side-by-side? Compare 40121 vs 40155 →
ZIP 40121 vs its nearest neighbors, by population
Resident population of this ZIP and the closest reporting ZIP codes within ~10 miles.
- 40160
Radcliff (40160)
23,574 residents
- 40175
Vine Grove (40175)
13,070 residents
- 40121
Fort Knox (40121)
10,124 residents
- 40177 1,463
West Point (40177)
1,463 residents
- 47135 1,372
Laconia (47135)
1,372 residents
- 40155 947
Muldraugh (40155)
947 residents
What this shows Among its immediate neighbors, ZIP 40121 ranks #3 by population - useful context the national average alone can't give.
ZIP 40121 vs its nearest neighbors, by median income
Median household income of this ZIP and the closest reporting ZIP codes within ~10 miles.
- 40121
Fort Knox (40121)
$82,663 median income
- 40175
Vine Grove (40175)
$77,509 median income
- 40155
Muldraugh (40155)
$60,508 median income
- 40160
Radcliff (40160)
$58,506 median income
- 40177
West Point (40177)
$50,577 median income
- 47135
Laconia (47135)
$48,611 median income
What this shows By household income, ZIP 40121 ranks the highest of 6 neighboring ZIPs, local affluence varies block to block, not just metro to metro.
More ZIP Codes in Hardin County
Related Areas
Frequently Asked Questions
What county is ZIP code 40121 in? ▼
What is the population of ZIP code 40121? ▼
What is the median household income in ZIP 40121? ▼
What is the demographic makeup of ZIP 40121? ▼
How many businesses are in ZIP code 40121? ▼
What are the main industries in ZIP code 40121? ▼
What is the education level in ZIP code 40121? ▼
What is the average commute time in ZIP 40121? ▼
What is the poverty rate in ZIP code 40121? ▼
Read our methodology to see how this data is sourced, computed, and verified.