FIPS code 40039 is Custer County, Oklahoma. With a population of 28,391 (2022 ACS estimate), it ranks #33 in Oklahoma and #1511 nationally. Custer County is part of the Weatherford, 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
40039
Population
28,391
2022 ACS · #1511 nationally
Density
28.7/mi²
people per sq mile
Land Area
989
sq miles
Urban/Rural
Nonmetro — urban 20K+, not adjacent to metro
RUCC 5
How This FIPS Code Works
The 5-digit FIPS code 40039 is formed by combining the 2-digit state identifier 40 (Oklahoma) with the 3-digit county identifier 039. Together they uniquely identify Custer County in every US federal dataset. No two counties share the same 5-digit FIPS code.
Census ACS Data for FIPS 40039
From the 2022 ACS 5-year estimates — the same values you'd retrieve by querying the Census API with county FIPS 40039.
Median Household Income
$58,669
ACS B19013_001E
Poverty Rate
16.0%
ACS B17001 (below poverty level)
Median Age
32.4
ACS B01002_001E
Metropolitan Area
Adjacent Counties (6)
Counties that share a border with Custer County. Useful for regional analysis — these are the geographies you'd typically include when studying labor markets, commuting zones, or environmental spillovers around FIPS 40039.
Federal Datasets Using Code 40039
FIPS code 40039 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 40039 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:039",
"in": "state:40",
"key": "YOUR_CENSUS_API_KEY",
}
r = requests.get(url, params=params)
data = r.json() # [[header...], [Custer County, Oklahoma, income, pop, ...]-- 5-digit combined FIPS (state + county)
SELECT * FROM your_table WHERE county_fips = '40039';
-- Some datasets store state and county separately
SELECT * FROM your_table
WHERE state_fips = '40'
AND county_fips = '039';
-- ⚠ Never cast to integer — leading zeros are lost:
-- county_fips = 40039 is WRONG for this countylibrary(tidycensus)
get_acs(
geography = "county",
variables = c(income = "B19013_001E", pop = "B01003_001E"),
state = "40",
county = "039",
year = 2022
)ZIP Codes in Custer 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 Custer County. Why FIPS ≠ ZIP →
| ZIP Code | % in county |
|---|---|
| 73620 | 100.0% |
| 73639 | 100.0% |
| 73625 | 100.0% |
| 73669 | 75.9% |
| 73601 | 73.6% |
| 73096 | 69.5% |
| 73647 | 40.3% |
| 73626 | 40.0% |
| 73650 | 30.7% |
| 73654 | 14.4% |
| 73646 | 9.4% |
| 73048 | 7.0% |
| 73644 | 2.1% |