FIPS code 19181 is Warren County, Iowa. With a population of 52,709 (2022 ACS estimate), it ranks #11 in Iowa and #962 nationally. Warren County is part of the Des Moines-West Des Moines, IA. 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
19181
Population
52,709
2022 ACS · #962 nationally
Density
92.5/mi²
people per sq mile
Land Area
570
sq miles
Urban/Rural
Metro — 250K–1M population
RUCC 2
How This FIPS Code Works
The 5-digit FIPS code 19181 is formed by combining the 2-digit state identifier 19 (Iowa) with the 3-digit county identifier 181. Together they uniquely identify Warren County in every US federal dataset. No two counties share the same 5-digit FIPS code.
Census ACS Data for FIPS 19181
From the 2022 ACS 5-year estimates — the same values you'd retrieve by querying the Census API with county FIPS 19181.
Median Household Income
$89,741
ACS B19013_001E
Poverty Rate
6.2%
ACS B17001 (below poverty level)
Median Age
38.5
ACS B01002_001E
Metropolitan Area
Adjacent Counties (6)
Counties that share a border with Warren County. Useful for regional analysis — these are the geographies you'd typically include when studying labor markets, commuting zones, or environmental spillovers around FIPS 19181.
Federal Datasets Using Code 19181
FIPS code 19181 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 19181 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:181",
"in": "state:19",
"key": "YOUR_CENSUS_API_KEY",
}
r = requests.get(url, params=params)
data = r.json() # [[header...], [Warren County, Iowa, income, pop, ...]-- 5-digit combined FIPS (state + county)
SELECT * FROM your_table WHERE county_fips = '19181';
-- Some datasets store state and county separately
SELECT * FROM your_table
WHERE state_fips = '19'
AND county_fips = '181';
-- ⚠ Never cast to integer — leading zeros are lost:
-- county_fips = 19181 is WRONG for this countylibrary(tidycensus)
get_acs(
geography = "county",
variables = c(income = "B19013_001E", pop = "B01003_001E"),
state = "19",
county = "181",
year = 2022
)ZIP Codes in Warren 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 Warren County. Why FIPS ≠ ZIP →
| ZIP Code | % in county |
|---|---|
| 50166 | 100.0% |
| 50241 | 100.0% |
| 50160 | 100.0% |
| 50118 | 100.0% |
| 50125 | 100.0% |
| 50001 | 100.0% |
| 50145 | 100.0% |
| 50211 | 95.9% |
| 50210 | 77.2% |
| 50047 | 75.6% |
| 50139 | 52.8% |
| 50229 | 51.2% |
| 50240 | 48.6% |
| 50252 | 37.3% |
| 50061 | 34.0% |
| 50320 | 22.1% |
| 50225 | 15.4% |
| 50151 | 8.7% |
| 50257 | 3.7% |
| 50265 | 3.2% |
| 50321 | 0.0% |