Mercer County
West Virginia · County seat: Princeton · Active county or equivalent
FIPS code 54055 is Mercer County, West Virginia. With a population of 59,530 (2022 ACS estimate), it ranks #8 in West Virginia and #883 nationally. Mercer County is part of the Bluefield, WV-VA. The state FIPS code for West Virginia is 54. This code is used in Census Bureau, BLS, EPA, HUD, and USDA federal datasets to identify this county.
County FIPS
54055
Population
59,530
2022 ACS · #883 nationally
Density
142.1/mi²
people per sq mile
Land Area
419
sq miles
Urban/Rural
Nonmetro — urban 20K+, adjacent to metro
RUCC 4
How This FIPS Code Works
The 5-digit FIPS code 54055 is formed by combining the 2-digit state identifier 54 (West Virginia) with the 3-digit county identifier 055. Together they uniquely identify Mercer County in every US federal dataset. No two counties share the same 5-digit FIPS code.
Census ACS Data for FIPS 54055
From the 2022 ACS 5-year estimates — the same values you'd retrieve by querying the Census API with county FIPS 54055.
Median Household Income
$46,409
ACS B19013_001E
Poverty Rate
18.8%
ACS B17001 (below poverty level)
Median Age
43.3
ACS B01002_001E
Metropolitan Area
Adjacent Counties (7)
Counties that share a border with Mercer County. Useful for regional analysis — these are the geographies you'd typically include when studying labor markets, commuting zones, or environmental spillovers around FIPS 54055.
Federal Datasets Using Code 54055
FIPS code 54055 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 54055 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:055",
"in": "state:54",
"key": "YOUR_CENSUS_API_KEY",
}
r = requests.get(url, params=params)
data = r.json() # [[header...], [Mercer County, West Virginia, income, pop, ...]-- 5-digit combined FIPS (state + county)
SELECT * FROM your_table WHERE county_fips = '54055';
-- Some datasets store state and county separately
SELECT * FROM your_table
WHERE state_fips = '54'
AND county_fips = '055';
-- ⚠ Never cast to integer — leading zeros are lost:
-- county_fips = 54055 is WRONG for this countylibrary(tidycensus)
get_acs(
geography = "county",
variables = c(income = "B19013_001E", pop = "B01003_001E"),
state = "54",
county = "055",
year = 2022
)ZIP Codes in Mercer 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 Mercer County. Why FIPS ≠ ZIP →
| ZIP Code | % in county |
|---|---|
| 24701 | 100.0% |
| 24712 | 100.0% |
| 24714 | 100.0% |
| 24715 | 100.0% |
| 24724 | 100.0% |
| 24729 | 100.0% |
| 24731 | 100.0% |
| 24733 | 100.0% |
| 24739 | 100.0% |
| 24740 | 100.0% |
| 25820 | 100.0% |
| 25922 | 100.0% |
| 25971 | 100.0% |
| 24737 | 100.0% |
| 24738 | 100.0% |
| 24747 | 97.3% |
| 25841 | 89.0% |
| 24736 | 48.0% |
| 25902 | 25.0% |
| 25979 | 7.1% |