Walworth County
Wisconsin · County seat: Elkhorn · Active county or equivalent
FIPS code 55127 is Walworth County, Wisconsin. With a population of 105,127 (2022 ACS estimate), it ranks #15 in Wisconsin and #579 nationally. Walworth County is part of the Whitewater-Elkhorn, WI. The state FIPS code for Wisconsin is 55. This code is used in Census Bureau, BLS, EPA, HUD, and USDA federal datasets to identify this county.
County FIPS
55127
Population
105,127
2022 ACS · #579 nationally
Density
189.4/mi²
people per sq mile
Land Area
555
sq miles
Urban/Rural
Nonmetro — urban 20K+, adjacent to metro
RUCC 4
How This FIPS Code Works
The 5-digit FIPS code 55127 is formed by combining the 2-digit state identifier 55 (Wisconsin) with the 3-digit county identifier 127. Together they uniquely identify Walworth County in every US federal dataset. No two counties share the same 5-digit FIPS code.
Census ACS Data for FIPS 55127
From the 2022 ACS 5-year estimates — the same values you'd retrieve by querying the Census API with county FIPS 55127.
Median Household Income
$75,172
ACS B19013_001E
Poverty Rate
9.6%
ACS B17001 (below poverty level)
Median Age
40.7
ACS B01002_001E
Metropolitan Area
Adjacent Counties (7)
Counties that share a border with Walworth County. Useful for regional analysis — these are the geographies you'd typically include when studying labor markets, commuting zones, or environmental spillovers around FIPS 55127.
Federal Datasets Using Code 55127
FIPS code 55127 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 55127 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:127",
"in": "state:55",
"key": "YOUR_CENSUS_API_KEY",
}
r = requests.get(url, params=params)
data = r.json() # [[header...], [Walworth County, Wisconsin, income, pop, ...]-- 5-digit combined FIPS (state + county)
SELECT * FROM your_table WHERE county_fips = '55127';
-- Some datasets store state and county separately
SELECT * FROM your_table
WHERE state_fips = '55'
AND county_fips = '127';
-- ⚠ Never cast to integer — leading zeros are lost:
-- county_fips = 55127 is WRONG for this countylibrary(tidycensus)
get_acs(
geography = "county",
variables = c(income = "B19013_001E", pop = "B01003_001E"),
state = "55",
county = "127",
year = 2022
)ZIP Codes in Walworth 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 Walworth County. Why FIPS ≠ ZIP →
| ZIP Code | % in county |
|---|---|
| 53157 | 100.0% |
| 53184 | 100.0% |
| 53115 | 100.0% |
| 53195 | 100.0% |
| 53176 | 100.0% |
| 53121 | 100.0% |
| 53125 | 100.0% |
| 53191 | 100.0% |
| 53147 | 100.0% |
| 53585 | 95.4% |
| 53120 | 91.3% |
| 53128 | 85.9% |
| 53114 | 75.5% |
| 53190 | 49.0% |
| 53105 | 37.5% |
| 53119 | 9.0% |
| 53149 | 8.6% |
| 53525 | 5.4% |