Los Angeles County
California · County seat: Los Angeles · Active county or equivalent
FIPS code 06037 is Los Angeles County, California. With a population of 9,936,690 (2022 ACS estimate), it ranks #1 in California and #1 nationally. Los Angeles County is part of the Los Angeles-Long Beach-Anaheim, CA. The state FIPS code for California is 06. This code is used in Census Bureau, BLS, EPA, HUD, and USDA federal datasets to identify this county.
County FIPS
06037
Population
9,936,690
2022 ACS · #1 nationally
Density
2,448.7/mi²
people per sq mile
Land Area
4,058
sq miles
Urban/Rural
Metro — 1M+ population
RUCC 1
How This FIPS Code Works
The 5-digit FIPS code 06037 is formed by combining the 2-digit state identifier 06 (California) with the 3-digit county identifier 037. Together they uniquely identify Los Angeles County in every US federal dataset. No two counties share the same 5-digit FIPS code.
Census ACS Data for FIPS 06037
From the 2022 ACS 5-year estimates — the same values you'd retrieve by querying the Census API with county FIPS 06037.
Median Household Income
$83,411
ACS B19013_001E
Poverty Rate
13.7%
ACS B17001 (below poverty level)
Median Age
37.4
ACS B01002_001E
Metropolitan Area
Adjacent Counties (4)
Counties that share a border with Los Angeles County. Useful for regional analysis — these are the geographies you'd typically include when studying labor markets, commuting zones, or environmental spillovers around FIPS 06037.
Federal Datasets Using Code 06037
FIPS code 06037 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 06037 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:037",
"in": "state:06",
"key": "YOUR_CENSUS_API_KEY",
}
r = requests.get(url, params=params)
data = r.json() # [[header...], [Los Angeles County, California, income, pop, ...]-- 5-digit combined FIPS (state + county)
SELECT * FROM your_table WHERE county_fips = '06037';
-- Some datasets store state and county separately
SELECT * FROM your_table
WHERE state_fips = '06'
AND county_fips = '037';
-- ⚠ Never cast to integer — leading zeros are lost:
-- county_fips = 6037 is WRONG for this countylibrary(tidycensus)
get_acs(
geography = "county",
variables = c(income = "B19013_001E", pop = "B01003_001E"),
state = "06",
county = "037",
year = 2022
)ZIP Codes in Los Angeles 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 Los Angeles County. Why FIPS ≠ ZIP →
| ZIP Code | % in county |
|---|---|
| 93591 | 100.0% |
| 90002 | 100.0% |
| 90003 | 100.0% |
| 90004 | 100.0% |
| 90005 | 100.0% |
| 90006 | 100.0% |
| 90007 | 100.0% |
| 90008 | 100.0% |
| 90010 | 100.0% |
| 90011 | 100.0% |
| 90012 | 100.0% |
| 90013 | 100.0% |
| 90014 | 100.0% |
| 90015 | 100.0% |
| 90016 | 100.0% |
| 90017 | 100.0% |
| 90018 | 100.0% |
| 90019 | 100.0% |
| 90020 | 100.0% |
| 90021 | 100.0% |
| 90022 | 100.0% |
| 90023 | 100.0% |
| 90024 | 100.0% |
| 90025 | 100.0% |
| 90026 | 100.0% |
| 90027 | 100.0% |
| 90028 | 100.0% |
| 90029 | 100.0% |
| 90031 | 100.0% |
| 90032 | 100.0% |
Showing top 30 of 304 ZIP codes by residential address share.