FIPS code 12085 is Martin County, Florida. With a population of 159,399 (2022 ACS estimate), it ranks #32 in Florida and #418 nationally. Martin 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
12085
Population
159,399
2022 ACS · #418 nationally
Density
293.3/mi²
people per sq mile
Land Area
543
sq miles
Urban/Rural
Metro — 250K–1M population
RUCC 2
How This FIPS Code Works
The 5-digit FIPS code 12085 is formed by combining the 2-digit state identifier 12 (Florida) with the 3-digit county identifier 085. Together they uniquely identify Martin County in every US federal dataset. No two counties share the same 5-digit FIPS code.
Census ACS Data for FIPS 12085
From the 2022 ACS 5-year estimates — the same values you'd retrieve by querying the Census API with county FIPS 12085.
Median Household Income
$77,894
ACS B19013_001E
Poverty Rate
10.5%
ACS B17001 (below poverty level)
Median Age
53.2
ACS B01002_001E
Metropolitan Area
Adjacent Counties (5)
Counties that share a border with Martin County. Useful for regional analysis — these are the geographies you'd typically include when studying labor markets, commuting zones, or environmental spillovers around FIPS 12085.
Federal Datasets Using Code 12085
FIPS code 12085 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 12085 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:085",
"in": "state:12",
"key": "YOUR_CENSUS_API_KEY",
}
r = requests.get(url, params=params)
data = r.json() # [[header...], [Martin County, Florida, income, pop, ...]-- 5-digit combined FIPS (state + county)
SELECT * FROM your_table WHERE county_fips = '12085';
-- Some datasets store state and county separately
SELECT * FROM your_table
WHERE state_fips = '12'
AND county_fips = '085';
-- ⚠ Never cast to integer — leading zeros are lost:
-- county_fips = 12085 is WRONG for this countylibrary(tidycensus)
get_acs(
geography = "county",
variables = c(income = "B19013_001E", pop = "B01003_001E"),
state = "12",
county = "085",
year = 2022
)ZIP Codes in Martin 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 Martin County. Why FIPS ≠ ZIP →
| ZIP Code | % in county |
|---|---|
| 34994 | 100.0% |
| 33455 | 100.0% |
| 34997 | 100.0% |
| 34996 | 100.0% |
| 34956 | 100.0% |
| 34990 | 98.2% |
| 33469 | 71.6% |
| 33438 | 64.7% |
| 34957 | 62.4% |
| 33458 | 19.0% |
| 33478 | 18.3% |
| 34974 | 15.0% |