Fort Knox, KY 40121 ZIP Code Profile


ZIP Code 40121: Basic Data & USPS Preferred City Name

Preferred Name, USPS
Fort Knox, KY 40121

  • ZIP Code Type: STANDARD
  • County: Hardin County
  • Centroid: Latitude 37.927, Longitude -85.913
  • Time Zone: Eastern Time Zone (UTC -5 hours)
  • Observes DST: Yes

ZIP Code 40121 has segments in 2 Counties (Hardin, Meade).

  • Businesses Addresses: 115
  • PO Box Addresses: 316
  • Residential Addresses: 2,926
    • Multi-Family Addresses: 258
    • Single Family Addresses: 2,668

The ZIP Code maps and database are updated 4 times per year.
Database updated: May 1, 2018, Maps updated: February 1, 2018.

EXTREMELY LOCAL Demographic Data

Address Based Hyperlocal Data Input an address and get data & demographics for the pertinent census block group (CBG), a searchable map and a customized directory. The CBG is the smallest geographical unit used by the Census Bureau for reporting demographic data.


40121 ZIP Code Map

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Fort Knox, KY 40121 Data & Demographics (As of July 1, 2017)


Total Population 11,322
Daytime Population: Workers 9,813
Daytime Population: Residents 5,270
Total Daytime Population (TDP) 15,083
Ratio TDP/Total Population1 1.33
Population in Households 8,280
Population in Familes 8,007
Population in Group Qrtrs 3,042
Population Density2 101
Diversity Index3 65


Median Household Income $51,946
Average Household Income $60,881
Per Capita Income $18,608


Total Housing Units 2,983 (100%)
Owner Occupied HU 13 ( 0.4%)
Renter Occupied HU 2,369 (79.4%)
Vacant Housing Units 601 (20.1%)
Median Home Value $0
Average Home Value $0


Total Households 2,382
Average Household Size 3.48
Family Households 2,175
Average Family Size 4
  1. If the ratio of the TDP to Total Population is greater than 1, the location gains population during the day when commuting workers are present. If the ratio is less than 1, the location is more of a bedroom community where people commute to another place for work.
  2. Population Density = Total Population per square mile.
  3. The Diversity Index is a scale of 0 to 100 that represents the likelihood that two persons, chosen at random from the same area, belong to different race or ethnic groups. If an area's entire population belongs to one race AND one ethnic group, then the area has zero diversity. An area's diversity index increases to 100 when the population is evenly divided into two or more race/ethnic groups.


2010-2017 2017-2022
Population 1.92% 0.36%
Households 0.66% 0.43%
Families 0.64% 0.44%
Median Household Income   1.5%
Per Capita Income   1.76%

Fort Knox, KY 40121 - Peer Comparisons by Rank and Percentile

The table below compares 40121 to the other 756 ZIP Codes in Kentucky by rank and percentile using July 1, 2017 data. The location Ranked # 1 has the highest value. A location that ranks higher than 75% of its peers would be in the 75th percentile of the peer group.

Variable Description Rank Percentile
Total Population # 124 84th
Population Density # 222 71st
Diversity Index # 5 99th
Median Household Income # 114 85th
Per Capita Income # 519 32nd

Additional comparisons and rankings can be made with a VERY EASY TO USE Kentucky Census Data Comparison Tool.

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