St. Lucie County
Florida · County seat: Fort Pierce · Active county or equivalent
FIPS code 12111 is St. Lucie County, Florida. With a population of 334,682 (2022 ACS estimate), it ranks #20 in Florida and #212 nationally. St. Lucie County is part of the Port St. Lucie, FL. The state FIPS code for Florida is 12. This code is used in Census Bureau, BLS, EPA, HUD, and USDA federal datasets to identify this county.
County FIPS
12111
Population
334,682
2022 ACS · #212 nationally
Density
585.2/mi²
people per sq mile
Land Area
572
sq miles
Urban/Rural
Metro — 250K–1M population
RUCC 2
How This FIPS Code Works
The 5-digit FIPS code 12111 is formed by combining the 2-digit state identifier 12 (Florida) with the 3-digit county identifier 111. Together they uniquely identify St. Lucie County in every US federal dataset. No two counties share the same 5-digit FIPS code.
Census ACS Data for FIPS 12111
From the 2022 ACS 5-year estimates — the same values you'd retrieve by querying the Census API with county FIPS 12111.
Median Household Income
$66,154
ACS B19013_001E
Poverty Rate
12.5%
ACS B17001 (below poverty level)
Median Age
45.3
ACS B01002_001E
Metropolitan Area
Adjacent Counties (3)
Counties that share a border with St. Lucie County. Useful for regional analysis — these are the geographies you'd typically include when studying labor markets, commuting zones, or environmental spillovers around FIPS 12111.
Federal Datasets Using Code 12111
FIPS code 12111 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 12111 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:111",
"in": "state:12",
"key": "YOUR_CENSUS_API_KEY",
}
r = requests.get(url, params=params)
data = r.json() # [[header...], [St. Lucie County, Florida, income, pop, ...]-- 5-digit combined FIPS (state + county)
SELECT * FROM your_table WHERE county_fips = '12111';
-- Some datasets store state and county separately
SELECT * FROM your_table
WHERE state_fips = '12'
AND county_fips = '111';
-- ⚠ Never cast to integer — leading zeros are lost:
-- county_fips = 12111 is WRONG for this countylibrary(tidycensus)
get_acs(
geography = "county",
variables = c(income = "B19013_001E", pop = "B01003_001E"),
state = "12",
county = "111",
year = 2022
)ZIP Codes in St. Lucie 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 St. Lucie County. Why FIPS ≠ ZIP →
| ZIP Code | % in county |
|---|---|
| 34986 | 100.0% |
| 34946 | 100.0% |
| 34947 | 100.0% |
| 34949 | 100.0% |
| 34950 | 100.0% |
| 34951 | 100.0% |
| 34952 | 100.0% |
| 34953 | 100.0% |
| 34945 | 100.0% |
| 34987 | 100.0% |
| 34981 | 100.0% |
| 34982 | 100.0% |
| 34983 | 100.0% |
| 34984 | 100.0% |
| 34957 | 37.6% |
| 34972 | 5.8% |
| 34990 | 1.8% |