St. Croix Island
United States Virgin Islands · Independent city (not a county)
FIPS code 78010 is St. Croix Island, United States Virgin Islands. The state FIPS code for United States Virgin Islands is 78. This code is used in Census Bureau, BLS, EPA, HUD, and USDA federal datasets to identify this county.
How This FIPS Code Works
The 5-digit FIPS code 78010 is formed by combining the 2-digit state identifier 78 (United States Virgin Islands) with the 3-digit county identifier 010. Together they uniquely identify St. Croix Island in every US federal dataset. No two counties share the same 5-digit FIPS code.
Federal Datasets Using Code 78010
FIPS code 78010 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 78010 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:010",
"in": "state:78",
"key": "YOUR_CENSUS_API_KEY",
}
r = requests.get(url, params=params)
data = r.json() # [[header...], [St. Croix Island, United States Virgin Islands, income, pop, ...]-- 5-digit combined FIPS (state + county)
SELECT * FROM your_table WHERE county_fips = '78010';
-- Some datasets store state and county separately
SELECT * FROM your_table
WHERE state_fips = '78'
AND county_fips = '010';
-- ⚠ Never cast to integer — leading zeros are lost:
-- county_fips = 78010 is WRONG for this countylibrary(tidycensus)
get_acs(
geography = "county",
variables = c(income = "B19013_001E", pop = "B01003_001E"),
state = "78",
county = "010",
year = 2022
)ZIP Codes in St. Croix Island
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. Croix Island. Why FIPS ≠ ZIP →
| ZIP Code | % in county |
|---|---|
| 00820 | 100.0% |
| 00840 | 100.0% |
| 00850 | 100.0% |
| 00851 | 100.0% |