Island County
Washington · County seat: Coupeville · Active county or equivalent
FIPS code 53029 is Island County, Washington. With a population of 86,510 (2022 ACS estimate), it ranks #15 in Washington and #671 nationally. Island County is part of the Oak Harbor, WA. The state FIPS code for Washington is 53. This code is used in Census Bureau, BLS, EPA, HUD, and USDA federal datasets to identify this county.
County FIPS
53029
Population
86,510
2022 ACS · #671 nationally
Density
415.0/mi²
people per sq mile
Land Area
208
sq miles
Urban/Rural
Nonmetro — urban 20K+, adjacent to metro
RUCC 4
How This FIPS Code Works
The 5-digit FIPS code 53029 is formed by combining the 2-digit state identifier 53 (Washington) with the 3-digit county identifier 029. Together they uniquely identify Island County in every US federal dataset. No two counties share the same 5-digit FIPS code.
Census ACS Data for FIPS 53029
From the 2022 ACS 5-year estimates — the same values you'd retrieve by querying the Census API with county FIPS 53029.
Median Household Income
$82,850
ACS B19013_001E
Poverty Rate
6.8%
ACS B17001 (below poverty level)
Median Age
44.2
ACS B01002_001E
Metropolitan Area
Adjacent Counties (5)
Counties that share a border with Island County. Useful for regional analysis — these are the geographies you'd typically include when studying labor markets, commuting zones, or environmental spillovers around FIPS 53029.
Federal Datasets Using Code 53029
FIPS code 53029 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 53029 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:029",
"in": "state:53",
"key": "YOUR_CENSUS_API_KEY",
}
r = requests.get(url, params=params)
data = r.json() # [[header...], [Island County, Washington, income, pop, ...]
-- 5-digit combined FIPS (state + county)
SELECT * FROM your_table WHERE county_fips = '53029';
-- Some datasets store state and county separately
SELECT * FROM your_table
WHERE state_fips = '53'
AND county_fips = '029';
-- ⚠ Never cast to integer — leading zeros are lost:
-- county_fips = 53029 is WRONG for this county
library(tidycensus)
get_acs(
geography = "county",
variables = c(income = "B19013_001E", pop = "B01003_001E"),
state = "53",
county = "029",
year = 2022
)
ZIP Codes in Island 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 Island County. Why FIPS ≠ ZIP →
| ZIP Code | % in county |
|---|---|
| 98236 | 100.0% |
| 98239 | 100.0% |
| 98249 | 100.0% |
| 98253 | 100.0% |
| 98260 | 100.0% |
| 98277 | 100.0% |
| 98278 | 100.0% |
| 98282 | 98.5% |