Suffolk County
New York · County seat: Riverhead · Active county or equivalent
FIPS code 36103 is Suffolk County, New York. With a population of 1,524,486 (2022 ACS estimate), it ranks #4 in New York and #25 nationally. Suffolk County is part of the New York-Newark-Jersey City, NY-NJ. The state FIPS code for New York is 36. This code is used in Census Bureau, BLS, EPA, HUD, and USDA federal datasets to identify this county.
County FIPS
36103
Population
1,524,486
2022 ACS · #25 nationally
Density
1,671.5/mi²
people per sq mile
Land Area
912
sq miles
Urban/Rural
Metro — 1M+ population
RUCC 1
How This FIPS Code Works
The 5-digit FIPS code 36103 is formed by combining the 2-digit state identifier 36 (New York) with the 3-digit county identifier 103. Together they uniquely identify Suffolk County in every US federal dataset. No two counties share the same 5-digit FIPS code.
Census ACS Data for FIPS 36103
From the 2022 ACS 5-year estimates — the same values you'd retrieve by querying the Census API with county FIPS 36103.
Median Household Income
$122,498
ACS B19013_001E
Poverty Rate
6.5%
ACS B17001 (below poverty level)
Median Age
41.7
ACS B01002_001E
Metropolitan Area
Adjacent Counties (6)
Counties that share a border with Suffolk County. Useful for regional analysis — these are the geographies you'd typically include when studying labor markets, commuting zones, or environmental spillovers around FIPS 36103.
Federal Datasets Using Code 36103
FIPS code 36103 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 36103 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:103",
"in": "state:36",
"key": "YOUR_CENSUS_API_KEY",
}
r = requests.get(url, params=params)
data = r.json() # [[header...], [Suffolk County, New York, income, pop, ...]-- 5-digit combined FIPS (state + county)
SELECT * FROM your_table WHERE county_fips = '36103';
-- Some datasets store state and county separately
SELECT * FROM your_table
WHERE state_fips = '36'
AND county_fips = '103';
-- ⚠ Never cast to integer — leading zeros are lost:
-- county_fips = 36103 is WRONG for this countylibrary(tidycensus)
get_acs(
geography = "county",
variables = c(income = "B19013_001E", pop = "B01003_001E"),
state = "36",
county = "103",
year = 2022
)ZIP Codes in Suffolk 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 Suffolk County. Why FIPS ≠ ZIP →
| ZIP Code | % in county |
|---|---|
| 11980 | 100.0% |
| 11701 | 100.0% |
| 11702 | 100.0% |
| 11703 | 100.0% |
| 11704 | 100.0% |
| 11705 | 100.0% |
| 11706 | 100.0% |
| 11713 | 100.0% |
| 11715 | 100.0% |
| 11716 | 100.0% |
| 11717 | 100.0% |
| 11718 | 100.0% |
| 11719 | 100.0% |
| 11720 | 100.0% |
| 11721 | 100.0% |
| 11722 | 100.0% |
| 11724 | 100.0% |
| 11725 | 100.0% |
| 11726 | 100.0% |
| 11727 | 100.0% |
| 11729 | 100.0% |
| 11730 | 100.0% |
| 11731 | 100.0% |
| 11733 | 100.0% |
| 11978 | 100.0% |
| 06390 | 100.0% |
| 11738 | 100.0% |
| 11739 | 100.0% |
| 11740 | 100.0% |
| 11741 | 100.0% |
Showing top 30 of 109 ZIP codes by residential address share.