53033 FipsDecoder
56025 County FIPS Code

Natrona County

Wyoming · County seat: Casper · Active county or equivalent

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FIPS code 56025 is Natrona County, Wyoming. With a population of 79,506 (2022 ACS estimate), it ranks #2 in Wyoming and #715 nationally. Natrona County is part of the Casper, WY. The state FIPS code for Wyoming is 56. This code is used in Census Bureau, BLS, EPA, HUD, and USDA federal datasets to identify this county.

County FIPS

56025

State FIPS

56

WY

Population

79,506

2022 ACS · #715 nationally

Density

14.9/mi²

people per sq mile

Land Area

5,340

sq miles

Urban/Rural

Metro — under 250K population

RUCC 3

How This FIPS Code Works

56 025
56 = State FIPS (Wyoming)
025 = County FIPS

The 5-digit FIPS code 56025 is formed by combining the 2-digit state identifier 56 (Wyoming) with the 3-digit county identifier 025. Together they uniquely identify Natrona County in every US federal dataset. No two counties share the same 5-digit FIPS code.

Census ACS Data for FIPS 56025

From the 2022 ACS 5-year estimates — the same values you'd retrieve by querying the Census API with county FIPS 56025.

Median Household Income

$69,104

ACS B19013_001E

Poverty Rate

9.1%

ACS B17001 (below poverty level)

Median Age

37.7

ACS B01002_001E

Metropolitan Area

Adjacent Counties (5)

Counties that share a border with Natrona County. Useful for regional analysis — these are the geographies you'd typically include when studying labor markets, commuting zones, or environmental spillovers around FIPS 56025.

Federal Datasets Using Code 56025

FIPS code 56025 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 56025 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.

Census ACS API — Python 56025
import requests

url = "https://api.census.gov/data/2022/acs/acs5"
params = {
    "get":  "NAME,B19013_001E,B01003_001E",
    "for":  "county:025",
    "in":   "state:56",
    "key":  "YOUR_CENSUS_API_KEY",
}
r = requests.get(url, params=params)
data = r.json()  # [[header...], [Natrona County, Wyoming, income, pop, ...]
SQL — filtering by county FIPS 56025
-- 5-digit combined FIPS (state + county)
SELECT * FROM your_table WHERE county_fips = '56025';

-- Some datasets store state and county separately
SELECT * FROM your_table
WHERE state_fips = '56'
  AND county_fips = '025';

-- ⚠ Never cast to integer — leading zeros are lost:
-- county_fips = 56025 is WRONG for this county
R — tidycensus 56025
library(tidycensus)

get_acs(
  geography = "county",
  variables = c(income = "B19013_001E", pop = "B01003_001E"),
  state     = "56",
  county    = "025",
  year      = 2022
)
Zero-padding reminder: FIPS codes must always be stored and compared as zero-padded strings. 56 (not 56) and 025 (not 25) — losing the leading zeros is one of the most common data-join bugs in federal datasets. Full guide →

ZIP Codes in Natrona 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 Natrona County. Why FIPS ≠ ZIP →

ZIP Code % in county
82648 100.0%
82604 100.0%
82609 100.0%
82643 100.0%
82644 100.0%
82646 100.0%
82601 100.0%
82630 100.0%
82635 100.0%
82638 100.0%
82636 97.6%
82620 91.9%
82642 13.3%
82639 5.7%

Other Counties in Wyoming