FIPS code 19103 is Johnson County, Iowa. With a population of 153,360 (2022 ACS estimate), it ranks #4 in Iowa and #441 nationally. Johnson County is part of the Iowa City, 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
19103
Population
153,360
2022 ACS · #441 nationally
Density
249.8/mi²
people per sq mile
Land Area
614
sq miles
Urban/Rural
Metro — under 250K population
RUCC 3
How This FIPS Code Works
The 5-digit FIPS code 19103 is formed by combining the 2-digit state identifier 19 (Iowa) with the 3-digit county identifier 103. Together they uniquely identify Johnson County in every US federal dataset. No two counties share the same 5-digit FIPS code.
Census ACS Data for FIPS 19103
From the 2022 ACS 5-year estimates — the same values you'd retrieve by querying the Census API with county FIPS 19103.
Median Household Income
$72,977
ACS B19013_001E
Poverty Rate
16.9%
ACS B17001 (below poverty level)
Median Age
30.6
ACS B01002_001E
Metropolitan Area
Adjacent Counties (7)
Counties that share a border with Johnson County. Useful for regional analysis — these are the geographies you'd typically include when studying labor markets, commuting zones, or environmental spillovers around FIPS 19103.
Federal Datasets Using Code 19103
FIPS code 19103 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 19103 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:103",
"in": "state:19",
"key": "YOUR_CENSUS_API_KEY",
}
r = requests.get(url, params=params)
data = r.json() # [[header...], [Johnson County, Iowa, income, pop, ...]-- 5-digit combined FIPS (state + county)
SELECT * FROM your_table WHERE county_fips = '19103';
-- Some datasets store state and county separately
SELECT * FROM your_table
WHERE state_fips = '19'
AND county_fips = '103';
-- ⚠ Never cast to integer — leading zeros are lost:
-- county_fips = 19103 is WRONG for this countylibrary(tidycensus)
get_acs(
geography = "county",
variables = c(income = "B19013_001E", pop = "B01003_001E"),
state = "19",
county = "103",
year = 2022
)ZIP Codes in Johnson 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 Johnson County. Why FIPS ≠ ZIP →
| ZIP Code | % in county |
|---|---|
| 52246 | 100.0% |
| 52317 | 100.0% |
| 52340 | 100.0% |
| 52235 | 100.0% |
| 52240 | 100.0% |
| 52241 | 100.0% |
| 52242 | 100.0% |
| 52245 | 100.0% |
| 52322 | 99.2% |
| 52333 | 95.8% |
| 52338 | 93.9% |
| 52755 | 91.6% |
| 52247 | 55.0% |
| 52327 | 27.1% |
| 52203 | 21.3% |
| 52358 | 17.5% |
| 52325 | 13.8% |
| 52228 | 11.2% |
| 52253 | 8.8% |
| 52356 | 8.2% |
| 52227 | 6.6% |
| 52766 | 5.6% |
| 52404 | 5.0% |
| 52776 | 3.3% |