Stanislaus County
California · County seat: Modesto · Active county or equivalent
FIPS code 06099 is Stanislaus County, California. With a population of 552,063 (2022 ACS estimate), it ranks #16 in California and #124 nationally. Stanislaus County is part of the Modesto, 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
06099
Population
552,063
2022 ACS · #124 nationally
Density
369.3/mi²
people per sq mile
Land Area
1,495
sq miles
Urban/Rural
Metro — 250K–1M population
RUCC 2
How This FIPS Code Works
The 5-digit FIPS code 06099 is formed by combining the 2-digit state identifier 06 (California) with the 3-digit county identifier 099. Together they uniquely identify Stanislaus County in every US federal dataset. No two counties share the same 5-digit FIPS code.
Census ACS Data for FIPS 06099
From the 2022 ACS 5-year estimates — the same values you'd retrieve by querying the Census API with county FIPS 06099.
Median Household Income
$74,872
ACS B19013_001E
Poverty Rate
13.7%
ACS B17001 (below poverty level)
Median Age
34.5
ACS B01002_001E
Metropolitan Area
Adjacent Counties (7)
Counties that share a border with Stanislaus County. Useful for regional analysis — these are the geographies you'd typically include when studying labor markets, commuting zones, or environmental spillovers around FIPS 06099.
Federal Datasets Using Code 06099
FIPS code 06099 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 06099 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:099",
"in": "state:06",
"key": "YOUR_CENSUS_API_KEY",
}
r = requests.get(url, params=params)
data = r.json() # [[header...], [Stanislaus County, California, income, pop, ...]-- 5-digit combined FIPS (state + county)
SELECT * FROM your_table WHERE county_fips = '06099';
-- Some datasets store state and county separately
SELECT * FROM your_table
WHERE state_fips = '06'
AND county_fips = '099';
-- ⚠ Never cast to integer — leading zeros are lost:
-- county_fips = 6099 is WRONG for this countylibrary(tidycensus)
get_acs(
geography = "county",
variables = c(income = "B19013_001E", pop = "B01003_001E"),
state = "06",
county = "099",
year = 2022
)ZIP Codes in Stanislaus 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 Stanislaus County. Why FIPS ≠ ZIP →
| ZIP Code | % in county |
|---|---|
| 95387 | 100.0% |
| 95355 | 100.0% |
| 95356 | 100.0% |
| 95357 | 100.0% |
| 95358 | 100.0% |
| 95363 | 100.0% |
| 95367 | 100.0% |
| 95368 | 100.0% |
| 95382 | 100.0% |
| 95386 | 100.0% |
| 95307 | 100.0% |
| 95313 | 100.0% |
| 95319 | 100.0% |
| 95323 | 100.0% |
| 95326 | 100.0% |
| 95328 | 100.0% |
| 95350 | 100.0% |
| 95351 | 100.0% |
| 95354 | 100.0% |
| 95385 | 98.0% |
| 95361 | 97.7% |
| 95316 | 76.8% |
| 95360 | 76.5% |
| 95380 | 75.3% |
| 95230 | 49.0% |
| 95329 | 36.9% |
| 95322 | 2.3% |
| 95304 | 0.0% |