FIPS code 39159 is Union County, Ohio. With a population of 63,411 (2022 ACS estimate), it ranks #39 in Ohio and #849 nationally. Union County is part of the Columbus, 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
39159
Population
63,411
2022 ACS · #849 nationally
Density
146.9/mi²
people per sq mile
Land Area
432
sq miles
Urban/Rural
Metro — 1M+ population
RUCC 1
How This FIPS Code Works
The 5-digit FIPS code 39159 is formed by combining the 2-digit state identifier 39 (Ohio) with the 3-digit county identifier 159. Together they uniquely identify Union County in every US federal dataset. No two counties share the same 5-digit FIPS code.
Census ACS Data for FIPS 39159
From the 2022 ACS 5-year estimates — the same values you'd retrieve by querying the Census API with county FIPS 39159.
Median Household Income
$104,496
ACS B19013_001E
Poverty Rate
5.2%
ACS B17001 (below poverty level)
Median Age
38.4
ACS B01002_001E
Metropolitan Area
Adjacent Counties (7)
Counties that share a border with Union County. Useful for regional analysis — these are the geographies you'd typically include when studying labor markets, commuting zones, or environmental spillovers around FIPS 39159.
Federal Datasets Using Code 39159
FIPS code 39159 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 39159 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:159",
"in": "state:39",
"key": "YOUR_CENSUS_API_KEY",
}
r = requests.get(url, params=params)
data = r.json() # [[header...], [Union County, Ohio, income, pop, ...]-- 5-digit combined FIPS (state + county)
SELECT * FROM your_table WHERE county_fips = '39159';
-- Some datasets store state and county separately
SELECT * FROM your_table
WHERE state_fips = '39'
AND county_fips = '159';
-- ⚠ Never cast to integer — leading zeros are lost:
-- county_fips = 39159 is WRONG for this countylibrary(tidycensus)
get_acs(
geography = "county",
variables = c(income = "B19013_001E", pop = "B01003_001E"),
state = "39",
county = "159",
year = 2022
)ZIP Codes in Union 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 Union County. Why FIPS ≠ ZIP →
| ZIP Code | % in county |
|---|---|
| 43077 | 100.0% |
| 43007 | 100.0% |
| 43036 | 100.0% |
| 43040 | 99.2% |
| 43344 | 94.4% |
| 43045 | 92.8% |
| 43067 | 89.5% |
| 43358 | 51.5% |
| 43064 | 43.1% |
| 43029 | 21.3% |
| 43340 | 19.9% |
| 43061 | 16.4% |
| 43060 | 8.9% |
| 43016 | 8.5% |
| 43342 | 6.7% |
| 43017 | 4.1% |
| 43084 | 2.1% |
| 43319 | 0.8% |
| 43015 | 0.5% |
| 43345 | 0.4% |
| 43302 | 0.2% |