FIPS code 51115 is Mathews County, Virginia. With a population of 8,537 (2022 ACS estimate), it ranks #118 in Virginia and #2598 nationally. Mathews County is part of the Virginia Beach-Chesapeake-Norfolk, VA-NC. The state FIPS code for Virginia is 51. This code is used in Census Bureau, BLS, EPA, HUD, and USDA federal datasets to identify this county.
County FIPS
51115
Population
8,537
2022 ACS · #2598 nationally
Density
99.4/mi²
people per sq mile
Land Area
86
sq miles
Urban/Rural
Metro — 1M+ population
RUCC 1
How This FIPS Code Works
The 5-digit FIPS code 51115 is formed by combining the 2-digit state identifier 51 (Virginia) with the 3-digit county identifier 115. Together they uniquely identify Mathews County in every US federal dataset. No two counties share the same 5-digit FIPS code.
Census ACS Data for FIPS 51115
From the 2022 ACS 5-year estimates — the same values you'd retrieve by querying the Census API with county FIPS 51115.
Median Household Income
$79,054
ACS B19013_001E
Poverty Rate
6.8%
ACS B17001 (below poverty level)
Median Age
53.7
ACS B01002_001E
Metropolitan Area
Adjacent Counties (5)
Counties that share a border with Mathews County. Useful for regional analysis — these are the geographies you'd typically include when studying labor markets, commuting zones, or environmental spillovers around FIPS 51115.
Federal Datasets Using Code 51115
FIPS code 51115 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 51115 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:115",
"in": "state:51",
"key": "YOUR_CENSUS_API_KEY",
}
r = requests.get(url, params=params)
data = r.json() # [[header...], [Mathews County, Virginia, income, pop, ...]-- 5-digit combined FIPS (state + county)
SELECT * FROM your_table WHERE county_fips = '51115';
-- Some datasets store state and county separately
SELECT * FROM your_table
WHERE state_fips = '51'
AND county_fips = '115';
-- ⚠ Never cast to integer — leading zeros are lost:
-- county_fips = 51115 is WRONG for this countylibrary(tidycensus)
get_acs(
geography = "county",
variables = c(income = "B19013_001E", pop = "B01003_001E"),
state = "51",
county = "115",
year = 2022
)ZIP Codes in Mathews 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 Mathews County. Why FIPS ≠ ZIP →
| ZIP Code | % in county |
|---|---|
| 23163 | 100.0% |
| 23025 | 100.0% |
| 23035 | 100.0% |
| 23045 | 100.0% |
| 23138 | 100.0% |
| 23021 | 100.0% |
| 23056 | 100.0% |
| 23066 | 100.0% |
| 23068 | 100.0% |
| 23076 | 100.0% |
| 23109 | 100.0% |
| 23119 | 100.0% |
| 23130 | 100.0% |
| 23050 | 93.0% |
| 23128 | 83.4% |