Cleveland County
Oklahoma · County seat: Norman · Active county or equivalent
FIPS code 40027 is Cleveland County, Oklahoma. With a population of 295,060 (2022 ACS estimate), it ranks #3 in Oklahoma and #238 nationally. Cleveland County is part of the Oklahoma 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
40027
Population
295,060
2022 ACS · #238 nationally
Density
547.7/mi²
people per sq mile
Land Area
539
sq miles
Urban/Rural
Metro — 1M+ population
RUCC 1
How This FIPS Code Works
The 5-digit FIPS code 40027 is formed by combining the 2-digit state identifier 40 (Oklahoma) with the 3-digit county identifier 027. Together they uniquely identify Cleveland County in every US federal dataset. No two counties share the same 5-digit FIPS code.
Census ACS Data for FIPS 40027
From the 2022 ACS 5-year estimates — the same values you'd retrieve by querying the Census API with county FIPS 40027.
Median Household Income
$71,757
ACS B19013_001E
Poverty Rate
12.8%
ACS B17001 (below poverty level)
Median Age
34.8
ACS B01002_001E
Metropolitan Area
Adjacent Counties (4)
Counties that share a border with Cleveland County. Useful for regional analysis — these are the geographies you'd typically include when studying labor markets, commuting zones, or environmental spillovers around FIPS 40027.
Federal Datasets Using Code 40027
FIPS code 40027 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 40027 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:027",
"in": "state:40",
"key": "YOUR_CENSUS_API_KEY",
}
r = requests.get(url, params=params)
data = r.json() # [[header...], [Cleveland County, Oklahoma, income, pop, ...]-- 5-digit combined FIPS (state + county)
SELECT * FROM your_table WHERE county_fips = '40027';
-- Some datasets store state and county separately
SELECT * FROM your_table
WHERE state_fips = '40'
AND county_fips = '027';
-- ⚠ Never cast to integer — leading zeros are lost:
-- county_fips = 40027 is WRONG for this countylibrary(tidycensus)
get_acs(
geography = "county",
variables = c(income = "B19013_001E", pop = "B01003_001E"),
state = "40",
county = "027",
year = 2022
)ZIP Codes in Cleveland 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 Cleveland County. Why FIPS ≠ ZIP →
| ZIP Code | % in county |
|---|---|
| 73019 | 100.0% |
| 73160 | 100.0% |
| 73173 | 100.0% |
| 73026 | 100.0% |
| 73068 | 100.0% |
| 73069 | 100.0% |
| 73070 | 100.0% |
| 73071 | 100.0% |
| 73170 | 100.0% |
| 73165 | 100.0% |
| 73051 | 99.5% |
| 74857 | 70.0% |
| 73072 | 66.3% |
| 73169 | 39.3% |
| 73139 | 32.5% |
| 73159 | 31.4% |
| 74851 | 7.5% |
| 73149 | 6.9% |
| 74878 | 6.2% |
| 73020 | 5.5% |
| 73135 | 2.9% |
| 73150 | 1.9% |
| 74852 | 1.8% |