FIPS code 21105 is Hickman County, Kentucky. With a population of 4,491 (2022 ACS estimate), it ranks #118 in Kentucky and #2928 nationally. The state FIPS code for Kentucky is 21. This code is used in Census Bureau, BLS, EPA, HUD, and USDA federal datasets to identify this county.
County FIPS
21105
Population
4,491
2022 ACS · #2928 nationally
Density
18.5/mi²
people per sq mile
Land Area
242
sq miles
Urban/Rural
Nonmetro — rural, adjacent to metro
RUCC 8
How This FIPS Code Works
The 5-digit FIPS code 21105 is formed by combining the 2-digit state identifier 21 (Kentucky) with the 3-digit county identifier 105. Together they uniquely identify Hickman County in every US federal dataset. No two counties share the same 5-digit FIPS code.
Census ACS Data for FIPS 21105
From the 2022 ACS 5-year estimates — the same values you'd retrieve by querying the Census API with county FIPS 21105.
Median Household Income
$68,589
ACS B19013_001E
Poverty Rate
16.7%
ACS B17001 (below poverty level)
Median Age
46.6
ACS B01002_001E
Adjacent Counties (6)
Counties that share a border with Hickman County. Useful for regional analysis — these are the geographies you'd typically include when studying labor markets, commuting zones, or environmental spillovers around FIPS 21105.
Federal Datasets Using Code 21105
FIPS code 21105 appears as the county identifier in the following federal datasets. Analysts joining data across these sources use this code as the common geographic key.
Using FIPS Code 21105 in Code
Common patterns for querying federal datasets by this county's FIPS code. The leading zeros are significant — always treat FIPS codes as strings, not integers.
import requests
url = "https://api.census.gov/data/2022/acs/acs5"
params = {
"get": "NAME,B19013_001E,B01003_001E",
"for": "county:105",
"in": "state:21",
"key": "YOUR_CENSUS_API_KEY",
}
r = requests.get(url, params=params)
data = r.json() # [[header...], [Hickman County, Kentucky, income, pop, ...]-- 5-digit combined FIPS (state + county)
SELECT * FROM your_table WHERE county_fips = '21105';
-- Some datasets store state and county separately
SELECT * FROM your_table
WHERE state_fips = '21'
AND county_fips = '105';
-- ⚠ Never cast to integer — leading zeros are lost:
-- county_fips = 21105 is WRONG for this countylibrary(tidycensus)
get_acs(
geography = "county",
variables = c(income = "B19013_001E", pop = "B01003_001E"),
state = "21",
county = "105",
year = 2022
)ZIP Codes in Hickman County
ZIP codes do not align perfectly with county boundaries — a single ZIP code can span multiple counties, and a county can contain parts of many ZIP codes. The ratios below (from the Census 2020 ZCTA relationship file) show the land area share of each ZCTA that falls within Hickman County. Why FIPS ≠ ZIP →
| ZIP Code | % in county |
|---|---|
| 42031 | 100.0% |
| 42032 | 100.0% |
| 42085 | 43.3% |
| 42039 | 33.0% |
| 42041 | 22.7% |
| 42088 | 19.5% |
| 42021 | 9.8% |