FIPS code 01021 is Chilton County, Alabama. With a population of 45,140 (2022 ACS estimate), it ranks #29 in Alabama and #1079 nationally. Chilton County is part of the Birmingham, AL. The state FIPS code for Alabama is 01. This code is used in Census Bureau, BLS, EPA, HUD, and USDA federal datasets to identify this county.
County FIPS
01021
Population
45,140
2022 ACS · #1079 nationally
Density
65.2/mi²
people per sq mile
Land Area
693
sq miles
Urban/Rural
Metro — 1M+ population
RUCC 1
How This FIPS Code Works
The 5-digit FIPS code 01021 is formed by combining the 2-digit state identifier 01 (Alabama) with the 3-digit county identifier 021. Together they uniquely identify Chilton County in every US federal dataset. No two counties share the same 5-digit FIPS code.
Census ACS Data for FIPS 01021
From the 2022 ACS 5-year estimates — the same values you'd retrieve by querying the Census API with county FIPS 01021.
Median Household Income
$62,471
ACS B19013_001E
Poverty Rate
14.5%
ACS B17001 (below poverty level)
Median Age
39.9
ACS B01002_001E
Metropolitan Area
Adjacent Counties (7)
Counties that share a border with Chilton County. Useful for regional analysis — these are the geographies you'd typically include when studying labor markets, commuting zones, or environmental spillovers around FIPS 01021.
Federal Datasets Using Code 01021
FIPS code 01021 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 01021 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:021",
"in": "state:01",
"key": "YOUR_CENSUS_API_KEY",
}
r = requests.get(url, params=params)
data = r.json() # [[header...], [Chilton County, Alabama, income, pop, ...]-- 5-digit combined FIPS (state + county)
SELECT * FROM your_table WHERE county_fips = '01021';
-- Some datasets store state and county separately
SELECT * FROM your_table
WHERE state_fips = '01'
AND county_fips = '021';
-- ⚠ Never cast to integer — leading zeros are lost:
-- county_fips = 1021 is WRONG for this countylibrary(tidycensus)
get_acs(
geography = "county",
variables = c(income = "B19013_001E", pop = "B01003_001E"),
state = "01",
county = "021",
year = 2022
)ZIP Codes in Chilton 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 Chilton County. Why FIPS ≠ ZIP →
| ZIP Code | % in county |
|---|---|
| 36790 | 100.0% |
| 35045 | 100.0% |
| 35171 | 100.0% |
| 35085 | 100.0% |
| 36750 | 98.8% |
| 36091 | 84.5% |
| 35046 | 78.4% |
| 36758 | 37.8% |
| 36793 | 31.1% |
| 36006 | 24.4% |
| 36792 | 18.1% |
| 35115 | 18.1% |
| 35040 | 16.9% |
| 36051 | 15.4% |