FIPS code 21035 is Calloway County, Kentucky. With a population of 37,345 (2022 ACS estimate), it ranks #26 in Kentucky and #1262 nationally. Calloway County is part of the Murray, KY. 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
21035
Population
37,345
2022 ACS · #1262 nationally
Density
97.0/mi²
people per sq mile
Land Area
385
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 21035 is formed by combining the 2-digit state identifier 21 (Kentucky) with the 3-digit county identifier 035. Together they uniquely identify Calloway County in every US federal dataset. No two counties share the same 5-digit FIPS code.
Census ACS Data for FIPS 21035
From the 2022 ACS 5-year estimates — the same values you'd retrieve by querying the Census API with county FIPS 21035.
Median Household Income
$48,276
ACS B19013_001E
Poverty Rate
18.7%
ACS B17001 (below poverty level)
Median Age
35.6
ACS B01002_001E
Metropolitan Area
Adjacent Counties (5)
Counties that share a border with Calloway County. Useful for regional analysis — these are the geographies you'd typically include when studying labor markets, commuting zones, or environmental spillovers around FIPS 21035.
Federal Datasets Using Code 21035
FIPS code 21035 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 21035 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:035",
"in": "state:21",
"key": "YOUR_CENSUS_API_KEY",
}
r = requests.get(url, params=params)
data = r.json() # [[header...], [Calloway County, Kentucky, income, pop, ...]-- 5-digit combined FIPS (state + county)
SELECT * FROM your_table WHERE county_fips = '21035';
-- Some datasets store state and county separately
SELECT * FROM your_table
WHERE state_fips = '21'
AND county_fips = '035';
-- ⚠ Never cast to integer — leading zeros are lost:
-- county_fips = 21035 is WRONG for this countylibrary(tidycensus)
get_acs(
geography = "county",
variables = c(income = "B19013_001E", pop = "B01003_001E"),
state = "21",
county = "035",
year = 2022
)ZIP Codes in Calloway 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 Calloway County. Why FIPS ≠ ZIP →
| ZIP Code | % in county |
|---|---|
| 42020 | 100.0% |
| 42076 | 100.0% |
| 42071 | 99.4% |
| 42049 | 99.2% |
| 42036 | 98.6% |
| 42054 | 86.0% |
| 42040 | 20.3% |
| 42048 | 7.1% |
| 42025 | 1.6% |
| 42066 | 0.2% |