Arapahoe County
Colorado · County seat: Littleton · Active county or equivalent
FIPS code 08005 is Arapahoe County, Colorado. With a population of 654,453 (2022 ACS estimate), it ranks #3 in Colorado and #103 nationally. Arapahoe County is part of the Denver-Aurora-Centennial, CO. The state FIPS code for Colorado is 08. This code is used in Census Bureau, BLS, EPA, HUD, and USDA federal datasets to identify this county.
County FIPS
08005
Population
654,453
2022 ACS · #103 nationally
Density
820.0/mi²
people per sq mile
Land Area
798
sq miles
Urban/Rural
Metro — 1M+ population
RUCC 1
How This FIPS Code Works
The 5-digit FIPS code 08005 is formed by combining the 2-digit state identifier 08 (Colorado) with the 3-digit county identifier 005. Together they uniquely identify Arapahoe County in every US federal dataset. No two counties share the same 5-digit FIPS code.
Census ACS Data for FIPS 08005
From the 2022 ACS 5-year estimates — the same values you'd retrieve by querying the Census API with county FIPS 08005.
Median Household Income
$92,292
ACS B19013_001E
Poverty Rate
8.0%
ACS B17001 (below poverty level)
Median Age
37.1
ACS B01002_001E
Metropolitan Area
Adjacent Counties (7)
Counties that share a border with Arapahoe County. Useful for regional analysis — these are the geographies you'd typically include when studying labor markets, commuting zones, or environmental spillovers around FIPS 08005.
Federal Datasets Using Code 08005
FIPS code 08005 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 08005 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:005",
"in": "state:08",
"key": "YOUR_CENSUS_API_KEY",
}
r = requests.get(url, params=params)
data = r.json() # [[header...], [Arapahoe County, Colorado, income, pop, ...]-- 5-digit combined FIPS (state + county)
SELECT * FROM your_table WHERE county_fips = '08005';
-- Some datasets store state and county separately
SELECT * FROM your_table
WHERE state_fips = '08'
AND county_fips = '005';
-- ⚠ Never cast to integer — leading zeros are lost:
-- county_fips = 8005 is WRONG for this countylibrary(tidycensus)
get_acs(
geography = "county",
variables = c(income = "B19013_001E", pop = "B01003_001E"),
state = "08",
county = "005",
year = 2022
)ZIP Codes in Arapahoe 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 Arapahoe County. Why FIPS ≠ ZIP →
| ZIP Code | % in county |
|---|---|
| 80113 | 100.0% |
| 80013 | 100.0% |
| 80015 | 100.0% |
| 80017 | 100.0% |
| 80018 | 100.0% |
| 80122 | 100.0% |
| 80121 | 100.0% |
| 80111 | 100.0% |
| 80012 | 99.6% |
| 80120 | 98.9% |
| 80110 | 97.4% |
| 80016 | 95.4% |
| 80014 | 90.1% |
| 80112 | 72.9% |
| 80137 | 59.6% |
| 80105 | 59.2% |
| 80010 | 51.0% |
| 80247 | 45.7% |
| 80011 | 44.7% |
| 80231 | 41.8% |
| 80102 | 36.4% |
| 80246 | 34.0% |
| 80103 | 33.4% |
| 80136 | 31.4% |
| 80123 | 31.4% |
| 80222 | 15.2% |
| 80128 | 9.9% |
| 80230 | 9.2% |
| 80236 | 3.6% |
| 80224 | 2.5% |
Showing top 30 of 33 ZIP codes by residential address share.