FIPS code 39021 is Champaign County, Ohio. With a population of 38,715 (2022 ACS estimate), it ranks #63 in Ohio and #1224 nationally. Champaign County is part of the Urbana, OH. The state FIPS code for Ohio is 39. This code is used in Census Bureau, BLS, EPA, HUD, and USDA federal datasets to identify this county.
County FIPS
39021
Population
38,715
2022 ACS · #1224 nationally
Density
90.3/mi²
people per sq mile
Land Area
429
sq miles
Urban/Rural
Nonmetro — urban 2.5K–19.9K, adjacent to metro
RUCC 6
How This FIPS Code Works
The 5-digit FIPS code 39021 is formed by combining the 2-digit state identifier 39 (Ohio) with the 3-digit county identifier 021. Together they uniquely identify Champaign County in every US federal dataset. No two counties share the same 5-digit FIPS code.
Census ACS Data for FIPS 39021
From the 2022 ACS 5-year estimates — the same values you'd retrieve by querying the Census API with county FIPS 39021.
Median Household Income
$70,486
ACS B19013_001E
Poverty Rate
9.3%
ACS B17001 (below poverty level)
Median Age
41.7
ACS B01002_001E
Metropolitan Area
Adjacent Counties (6)
Counties that share a border with Champaign County. Useful for regional analysis — these are the geographies you'd typically include when studying labor markets, commuting zones, or environmental spillovers around FIPS 39021.
Federal Datasets Using Code 39021
FIPS code 39021 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 39021 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:021",
"in": "state:39",
"key": "YOUR_CENSUS_API_KEY",
}
r = requests.get(url, params=params)
data = r.json() # [[header...], [Champaign County, Ohio, income, pop, ...]-- 5-digit combined FIPS (state + county)
SELECT * FROM your_table WHERE county_fips = '39021';
-- Some datasets store state and county separately
SELECT * FROM your_table
WHERE state_fips = '39'
AND county_fips = '021';
-- ⚠ Never cast to integer — leading zeros are lost:
-- county_fips = 39021 is WRONG for this countylibrary(tidycensus)
get_acs(
geography = "county",
variables = c(income = "B19013_001E", pop = "B01003_001E"),
state = "39",
county = "021",
year = 2022
)ZIP Codes in Champaign 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 Champaign County. Why FIPS ≠ ZIP →
| ZIP Code | % in county |
|---|---|
| 43072 | 100.0% |
| 43009 | 100.0% |
| 45389 | 100.0% |
| 43047 | 100.0% |
| 43070 | 100.0% |
| 43078 | 99.2% |
| 43084 | 97.9% |
| 43060 | 69.3% |
| 43044 | 69.0% |
| 45317 | 48.2% |
| 43357 | 43.8% |
| 43318 | 32.2% |
| 43343 | 23.2% |
| 43045 | 7.2% |
| 45312 | 2.0% |
| 45502 | 1.4% |
| 45344 | 1.1% |
| 45365 | 0.6% |