Grundy County
Iowa · County seat: Grundy Center · Active county or equivalent
FIPS code 19075 is Grundy County, Iowa. With a population of 12,351 (2022 ACS estimate), it ranks #60 in Iowa and #2314 nationally. Grundy County is part of the Waterloo-Cedar Falls, 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
19075
Population
12,351
2022 ACS · #2314 nationally
Density
24.6/mi²
people per sq mile
Land Area
502
sq miles
Urban/Rural
Metro — under 250K population
RUCC 3
How This FIPS Code Works
The 5-digit FIPS code 19075 is formed by combining the 2-digit state identifier 19 (Iowa) with the 3-digit county identifier 075. Together they uniquely identify Grundy County in every US federal dataset. No two counties share the same 5-digit FIPS code.
Census ACS Data for FIPS 19075
From the 2022 ACS 5-year estimates — the same values you'd retrieve by querying the Census API with county FIPS 19075.
Median Household Income
$80,701
ACS B19013_001E
Poverty Rate
5.9%
ACS B17001 (below poverty level)
Median Age
41.6
ACS B01002_001E
Metropolitan Area
Adjacent Counties (6)
Counties that share a border with Grundy County. Useful for regional analysis — these are the geographies you'd typically include when studying labor markets, commuting zones, or environmental spillovers around FIPS 19075.
Federal Datasets Using Code 19075
FIPS code 19075 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 19075 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:075",
"in": "state:19",
"key": "YOUR_CENSUS_API_KEY",
}
r = requests.get(url, params=params)
data = r.json() # [[header...], [Grundy County, Iowa, income, pop, ...]-- 5-digit combined FIPS (state + county)
SELECT * FROM your_table WHERE county_fips = '19075';
-- Some datasets store state and county separately
SELECT * FROM your_table
WHERE state_fips = '19'
AND county_fips = '075';
-- ⚠ Never cast to integer — leading zeros are lost:
-- county_fips = 19075 is WRONG for this countylibrary(tidycensus)
get_acs(
geography = "county",
variables = c(income = "B19013_001E", pop = "B01003_001E"),
state = "19",
county = "075",
year = 2022
)ZIP Codes in Grundy 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 Grundy County. Why FIPS ≠ ZIP →
| ZIP Code | % in county |
|---|---|
| 50624 | 100.0% |
| 50673 | 100.0% |
| 50657 | 100.0% |
| 50642 | 100.0% |
| 50638 | 100.0% |
| 50680 | 99.2% |
| 50621 | 83.8% |
| 50669 | 69.1% |
| 50609 | 65.9% |
| 50665 | 35.6% |
| 50660 | 21.1% |
| 50604 | 20.5% |
| 50627 | 17.3% |
| 50601 | 16.0% |
| 50613 | 15.5% |
| 50643 | 9.4% |
| 50672 | 9.3% |