Winnebago County
Iowa · County seat: Forest City · Active county or equivalent
FIPS code 19189 is Winnebago County, Iowa. With a population of 10,704 (2022 ACS estimate), it ranks #69 in Iowa and #2431 nationally. The state FIPS code for Iowa is 19. This code is used in Census Bureau, BLS, EPA, HUD, and USDA federal datasets to identify this county.
County FIPS
19189
Population
10,704
2022 ACS · #2431 nationally
Density
26.7/mi²
people per sq mile
Land Area
400
sq miles
Urban/Rural
Nonmetro — completely rural
RUCC 9
How This FIPS Code Works
The 5-digit FIPS code 19189 is formed by combining the 2-digit state identifier 19 (Iowa) with the 3-digit county identifier 189. Together they uniquely identify Winnebago County in every US federal dataset. No two counties share the same 5-digit FIPS code.
Census ACS Data for FIPS 19189
From the 2022 ACS 5-year estimates — the same values you'd retrieve by querying the Census API with county FIPS 19189.
Median Household Income
$62,853
ACS B19013_001E
Poverty Rate
7.8%
ACS B17001 (below poverty level)
Median Age
41.5
ACS B01002_001E
Adjacent Counties (6)
Counties that share a border with Winnebago County. Useful for regional analysis — these are the geographies you'd typically include when studying labor markets, commuting zones, or environmental spillovers around FIPS 19189.
Federal Datasets Using Code 19189
FIPS code 19189 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 19189 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:189",
"in": "state:19",
"key": "YOUR_CENSUS_API_KEY",
}
r = requests.get(url, params=params)
data = r.json() # [[header...], [Winnebago County, Iowa, income, pop, ...]-- 5-digit combined FIPS (state + county)
SELECT * FROM your_table WHERE county_fips = '19189';
-- Some datasets store state and county separately
SELECT * FROM your_table
WHERE state_fips = '19'
AND county_fips = '189';
-- ⚠ Never cast to integer — leading zeros are lost:
-- county_fips = 19189 is WRONG for this countylibrary(tidycensus)
get_acs(
geography = "county",
variables = c(income = "B19013_001E", pop = "B01003_001E"),
state = "19",
county = "189",
year = 2022
)ZIP Codes in Winnebago 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 Winnebago County. Why FIPS ≠ ZIP →
| ZIP Code | % in county |
|---|---|
| 50453 | 100.0% |
| 50465 | 100.0% |
| 50478 | 100.0% |
| 50473 | 100.0% |
| 50450 | 68.0% |
| 50424 | 62.2% |
| 50436 | 57.9% |
| 50484 | 33.2% |
| 50446 | 11.5% |
| 50480 | 1.1% |
| 50459 | 0.2% |