FIPS code 21001 is Adair County, Kentucky. With a population of 18,887 (2022 ACS estimate), it ranks #63 in Kentucky and #1930 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
21001
Population
18,887
2022 ACS · #1930 nationally
Density
46.6/mi²
people per sq mile
Land Area
405
sq miles
Urban/Rural
Nonmetro — urban 2.5K–19.9K, not adjacent to metro
RUCC 7
How This FIPS Code Works
The 5-digit FIPS code 21001 is formed by combining the 2-digit state identifier 21 (Kentucky) with the 3-digit county identifier 001. Together they uniquely identify Adair County in every US federal dataset. No two counties share the same 5-digit FIPS code.
Census ACS Data for FIPS 21001
From the 2022 ACS 5-year estimates — the same values you'd retrieve by querying the Census API with county FIPS 21001.
Median Household Income
$49,690
ACS B19013_001E
Poverty Rate
19.8%
ACS B17001 (below poverty level)
Median Age
40.3
ACS B01002_001E
Adjacent Counties (6)
Counties that share a border with Adair County. Useful for regional analysis — these are the geographies you'd typically include when studying labor markets, commuting zones, or environmental spillovers around FIPS 21001.
Federal Datasets Using Code 21001
FIPS code 21001 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 21001 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:001",
"in": "state:21",
"key": "YOUR_CENSUS_API_KEY",
}
r = requests.get(url, params=params)
data = r.json() # [[header...], [Adair County, Kentucky, income, pop, ...]-- 5-digit combined FIPS (state + county)
SELECT * FROM your_table WHERE county_fips = '21001';
-- Some datasets store state and county separately
SELECT * FROM your_table
WHERE state_fips = '21'
AND county_fips = '001';
-- ⚠ Never cast to integer — leading zeros are lost:
-- county_fips = 21001 is WRONG for this countylibrary(tidycensus)
get_acs(
geography = "county",
variables = c(income = "B19013_001E", pop = "B01003_001E"),
state = "21",
county = "001",
year = 2022
)ZIP Codes in Adair 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 Adair County. Why FIPS ≠ ZIP →
| ZIP Code | % in county |
|---|---|
| 42753 | 100.0% |
| 42742 | 100.0% |
| 42741 | 98.3% |
| 42728 | 96.0% |
| 42715 | 61.8% |
| 42528 | 16.2% |
| 42642 | 10.2% |
| 42129 | 4.9% |
| 42743 | 2.7% |
| 42733 | 2.6% |
| 42539 | 1.1% |