Campbell County
Kentucky · County seat: Alexandria · Active county or equivalent
FIPS code 21037 is Campbell County, Kentucky. With a population of 93,122 (2022 ACS estimate), it ranks #8 in Kentucky and #643 nationally. Campbell County is part of the Cincinnati, OH-KY-IN. 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
21037
Population
93,122
2022 ACS · #643 nationally
Density
615.4/mi²
people per sq mile
Land Area
151
sq miles
Urban/Rural
Metro — 1M+ population
RUCC 1
How This FIPS Code Works
The 5-digit FIPS code 21037 is formed by combining the 2-digit state identifier 21 (Kentucky) with the 3-digit county identifier 037. Together they uniquely identify Campbell County in every US federal dataset. No two counties share the same 5-digit FIPS code.
Census ACS Data for FIPS 21037
From the 2022 ACS 5-year estimates — the same values you'd retrieve by querying the Census API with county FIPS 21037.
Median Household Income
$71,979
ACS B19013_001E
Poverty Rate
11.7%
ACS B17001 (below poverty level)
Median Age
38.9
ACS B01002_001E
Metropolitan Area
Adjacent Counties (4)
Counties that share a border with Campbell County. Useful for regional analysis — these are the geographies you'd typically include when studying labor markets, commuting zones, or environmental spillovers around FIPS 21037.
Federal Datasets Using Code 21037
FIPS code 21037 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 21037 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:037",
"in": "state:21",
"key": "YOUR_CENSUS_API_KEY",
}
r = requests.get(url, params=params)
data = r.json() # [[header...], [Campbell County, Kentucky, income, pop, ...]-- 5-digit combined FIPS (state + county)
SELECT * FROM your_table WHERE county_fips = '21037';
-- Some datasets store state and county separately
SELECT * FROM your_table
WHERE state_fips = '21'
AND county_fips = '037';
-- ⚠ Never cast to integer — leading zeros are lost:
-- county_fips = 21037 is WRONG for this countylibrary(tidycensus)
get_acs(
geography = "county",
variables = c(income = "B19013_001E", pop = "B01003_001E"),
state = "21",
county = "037",
year = 2022
)ZIP Codes in Campbell 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 Campbell County. Why FIPS ≠ ZIP →
| ZIP Code | % in county |
|---|---|
| 41085 | 100.0% |
| 41076 | 100.0% |
| 41001 | 100.0% |
| 41059 | 100.0% |
| 41071 | 100.0% |
| 41073 | 100.0% |
| 41074 | 100.0% |
| 41075 | 100.0% |
| 41007 | 89.5% |
| 41006 | 12.1% |