FIPS code 40071 is Kay County, Oklahoma. With a population of 43,859 (2022 ACS estimate), it ranks #21 in Oklahoma and #1110 nationally. Kay County is part of the Ponca City, OK. The state FIPS code for Oklahoma is 40. This code is used in Census Bureau, BLS, EPA, HUD, and USDA federal datasets to identify this county.
County FIPS
40071
Population
43,859
2022 ACS · #1110 nationally
Density
47.7/mi²
people per sq mile
Land Area
920
sq miles
Urban/Rural
Nonmetro — urban 20K+, adjacent to metro
RUCC 4
How This FIPS Code Works
The 5-digit FIPS code 40071 is formed by combining the 2-digit state identifier 40 (Oklahoma) with the 3-digit county identifier 071. Together they uniquely identify Kay County in every US federal dataset. No two counties share the same 5-digit FIPS code.
Census ACS Data for FIPS 40071
From the 2022 ACS 5-year estimates — the same values you'd retrieve by querying the Census API with county FIPS 40071.
Median Household Income
$53,746
ACS B19013_001E
Poverty Rate
16.4%
ACS B17001 (below poverty level)
Median Age
38.2
ACS B01002_001E
Metropolitan Area
Adjacent Counties (6)
Counties that share a border with Kay County. Useful for regional analysis — these are the geographies you'd typically include when studying labor markets, commuting zones, or environmental spillovers around FIPS 40071.
Federal Datasets Using Code 40071
FIPS code 40071 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 40071 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:071",
"in": "state:40",
"key": "YOUR_CENSUS_API_KEY",
}
r = requests.get(url, params=params)
data = r.json() # [[header...], [Kay County, Oklahoma, income, pop, ...]-- 5-digit combined FIPS (state + county)
SELECT * FROM your_table WHERE county_fips = '40071';
-- Some datasets store state and county separately
SELECT * FROM your_table
WHERE state_fips = '40'
AND county_fips = '071';
-- ⚠ Never cast to integer — leading zeros are lost:
-- county_fips = 40071 is WRONG for this countylibrary(tidycensus)
get_acs(
geography = "county",
variables = c(income = "B19013_001E", pop = "B01003_001E"),
state = "40",
county = "071",
year = 2022
)ZIP Codes in Kay 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 Kay County. Why FIPS ≠ ZIP →
| ZIP Code | % in county |
|---|---|
| 74647 | 100.0% |
| 74631 | 100.0% |
| 74632 | 100.0% |
| 74641 | 100.0% |
| 74601 | 95.7% |
| 74653 | 90.4% |
| 74646 | 76.9% |
| 74604 | 49.9% |
| 74652 | 9.3% |
| 74643 | 6.9% |