Marshall County
Iowa · County seat: Marshalltown · Active county or equivalent
FIPS code 19127 is Marshall County, Iowa. With a population of 40,049 (2022 ACS estimate), it ranks #15 in Iowa and #1196 nationally. Marshall County is part of the Marshalltown, 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
19127
Population
40,049
2022 ACS · #1196 nationally
Density
70.0/mi²
people per sq mile
Land Area
573
sq miles
Urban/Rural
Nonmetro — urban 20K+, adjacent to metro
RUCC 4
How This FIPS Code Works
The 5-digit FIPS code 19127 is formed by combining the 2-digit state identifier 19 (Iowa) with the 3-digit county identifier 127. Together they uniquely identify Marshall County in every US federal dataset. No two counties share the same 5-digit FIPS code.
Census ACS Data for FIPS 19127
From the 2022 ACS 5-year estimates — the same values you'd retrieve by querying the Census API with county FIPS 19127.
Median Household Income
$70,828
ACS B19013_001E
Poverty Rate
11.2%
ACS B17001 (below poverty level)
Median Age
38.5
ACS B01002_001E
Metropolitan Area
Adjacent Counties (6)
Counties that share a border with Marshall County. Useful for regional analysis — these are the geographies you'd typically include when studying labor markets, commuting zones, or environmental spillovers around FIPS 19127.
Federal Datasets Using Code 19127
FIPS code 19127 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 19127 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:19",
"key": "YOUR_CENSUS_API_KEY",
}
r = requests.get(url, params=params)
data = r.json() # [[header...], [Marshall County, Iowa, income, pop, ...]-- 5-digit combined FIPS (state + county)
SELECT * FROM your_table WHERE county_fips = '19127';
-- Some datasets store state and county separately
SELECT * FROM your_table
WHERE state_fips = '19'
AND county_fips = '127';
-- ⚠ Never cast to integer — leading zeros are lost:
-- county_fips = 19127 is WRONG for this countylibrary(tidycensus)
get_acs(
geography = "county",
variables = c(income = "B19013_001E", pop = "B01003_001E"),
state = "19",
county = "127",
year = 2022
)ZIP Codes in Marshall 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 Marshall County. Why FIPS ≠ ZIP →
| ZIP Code | % in county |
|---|---|
| 50120 | 100.0% |
| 50005 | 100.0% |
| 50051 | 100.0% |
| 50148 | 100.0% |
| 50078 | 100.0% |
| 50142 | 100.0% |
| 50158 | 98.6% |
| 50162 | 96.3% |
| 50239 | 94.0% |
| 50247 | 93.5% |
| 50234 | 83.1% |
| 50141 | 57.1% |
| 50106 | 51.1% |
| 50609 | 30.7% |
| 50258 | 28.6% |
| 50621 | 16.2% |
| 50206 | 16.1% |
| 50028 | 4.5% |
| 50055 | 4.4% |
| 50635 | 4.1% |
| 50632 | 1.3% |