FIPS code 05113 is Polk County, Arkansas. With a population of 19,384 (2022 ACS estimate), it ranks #35 in Arkansas and #1906 nationally. The state FIPS code for Arkansas is 05. This code is used in Census Bureau, BLS, EPA, HUD, and USDA federal datasets to identify this county.
County FIPS
05113
Population
19,384
2022 ACS · #1906 nationally
Density
22.6/mi²
people per sq mile
Land Area
858
sq miles
Urban/Rural
Nonmetro — urban 2.5K–19.9K, not adjacent to metro
RUCC 7
How This FIPS Code Works
The 5-digit FIPS code 05113 is formed by combining the 2-digit state identifier 05 (Arkansas) with the 3-digit county identifier 113. Together they uniquely identify Polk County in every US federal dataset. No two counties share the same 5-digit FIPS code.
Census ACS Data for FIPS 05113
From the 2022 ACS 5-year estimates — the same values you'd retrieve by querying the Census API with county FIPS 05113.
Median Household Income
$48,449
ACS B19013_001E
Poverty Rate
17.8%
ACS B17001 (below poverty level)
Median Age
44.4
ACS B01002_001E
Adjacent Counties (7)
Counties that share a border with Polk County. Useful for regional analysis — these are the geographies you'd typically include when studying labor markets, commuting zones, or environmental spillovers around FIPS 05113.
Federal Datasets Using Code 05113
FIPS code 05113 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 05113 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:113",
"in": "state:05",
"key": "YOUR_CENSUS_API_KEY",
}
r = requests.get(url, params=params)
data = r.json() # [[header...], [Polk County, Arkansas, income, pop, ...]-- 5-digit combined FIPS (state + county)
SELECT * FROM your_table WHERE county_fips = '05113';
-- Some datasets store state and county separately
SELECT * FROM your_table
WHERE state_fips = '05'
AND county_fips = '113';
-- ⚠ Never cast to integer — leading zeros are lost:
-- county_fips = 5113 is WRONG for this countylibrary(tidycensus)
get_acs(
geography = "county",
variables = c(income = "B19013_001E", pop = "B01003_001E"),
state = "05",
county = "113",
year = 2022
)ZIP Codes in Polk 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 Polk County. Why FIPS ≠ ZIP →
| ZIP Code | % in county |
|---|---|
| 71945 | 100.0% |
| 71944 | 100.0% |
| 71972 | 100.0% |
| 71937 | 93.8% |
| 71953 | 75.3% |
| 71973 | 62.8% |
| 71841 | 12.6% |