Pennington County
South Dakota · County seat: Rapid City · Active county or equivalent
FIPS code 46103 is Pennington County, South Dakota. With a population of 110,386 (2022 ACS estimate), it ranks #2 in South Dakota and #555 nationally. Pennington County is part of the Rapid City, SD. The state FIPS code for South Dakota is 46. This code is used in Census Bureau, BLS, EPA, HUD, and USDA federal datasets to identify this county.
County FIPS
46103
Population
110,386
2022 ACS · #555 nationally
Density
39.8/mi²
people per sq mile
Land Area
2,777
sq miles
Urban/Rural
Metro — under 250K population
RUCC 3
How This FIPS Code Works
The 5-digit FIPS code 46103 is formed by combining the 2-digit state identifier 46 (South Dakota) with the 3-digit county identifier 103. Together they uniquely identify Pennington County in every US federal dataset. No two counties share the same 5-digit FIPS code.
Census ACS Data for FIPS 46103
From the 2022 ACS 5-year estimates — the same values you'd retrieve by querying the Census API with county FIPS 46103.
Median Household Income
$67,823
ACS B19013_001E
Poverty Rate
12.3%
ACS B17001 (below poverty level)
Median Age
39.6
ACS B01002_001E
Metropolitan Area
Adjacent Counties (6)
Counties that share a border with Pennington County. Useful for regional analysis — these are the geographies you'd typically include when studying labor markets, commuting zones, or environmental spillovers around FIPS 46103.
Federal Datasets Using Code 46103
FIPS code 46103 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 46103 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:46",
"key": "YOUR_CENSUS_API_KEY",
}
r = requests.get(url, params=params)
data = r.json() # [[header...], [Pennington County, South Dakota, income, pop, ...]-- 5-digit combined FIPS (state + county)
SELECT * FROM your_table WHERE county_fips = '46103';
-- Some datasets store state and county separately
SELECT * FROM your_table
WHERE state_fips = '46'
AND county_fips = '103';
-- ⚠ Never cast to integer — leading zeros are lost:
-- county_fips = 46103 is WRONG for this countylibrary(tidycensus)
get_acs(
geography = "county",
variables = c(income = "B19013_001E", pop = "B01003_001E"),
state = "46",
county = "103",
year = 2022
)ZIP Codes in Pennington 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 Pennington County. Why FIPS ≠ ZIP →
| ZIP Code | % in county |
|---|---|
| 57745 | 100.0% |
| 57725 | 100.0% |
| 57703 | 100.0% |
| 57790 | 98.1% |
| 57702 | 94.3% |
| 57780 | 91.1% |
| 57751 | 66.6% |
| 57701 | 64.3% |
| 57767 | 49.4% |
| 57775 | 45.6% |
| 57761 | 33.3% |
| 57791 | 29.5% |
| 57719 | 23.5% |
| 57744 | 21.5% |
| 57732 | 10.2% |
| 57730 | 8.3% |
| 57706 | 6.6% |
| 82701 | 3.5% |
| 57750 | 1.9% |
| 57718 | 1.3% |