Lunenburg County
Virginia · County seat: Lunenburg · Active county or equivalent
FIPS code 51111 is Lunenburg County, Virginia. With a population of 11,988 (2022 ACS estimate), it ranks #109 in Virginia and #2348 nationally. 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
51111
Population
11,988
2022 ACS · #2348 nationally
Density
27.8/mi²
people per sq mile
Land Area
432
sq miles
Urban/Rural
Nonmetro — completely rural
RUCC 9
How This FIPS Code Works
The 5-digit FIPS code 51111 is formed by combining the 2-digit state identifier 51 (Virginia) with the 3-digit county identifier 111. Together they uniquely identify Lunenburg County in every US federal dataset. No two counties share the same 5-digit FIPS code.
Census ACS Data for FIPS 51111
From the 2022 ACS 5-year estimates — the same values you'd retrieve by querying the Census API with county FIPS 51111.
Median Household Income
$54,438
ACS B19013_001E
Poverty Rate
13.0%
ACS B17001 (below poverty level)
Median Age
44.0
ACS B01002_001E
Adjacent Counties (5)
Counties that share a border with Lunenburg County. Useful for regional analysis — these are the geographies you'd typically include when studying labor markets, commuting zones, or environmental spillovers around FIPS 51111.
Federal Datasets Using Code 51111
FIPS code 51111 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 51111 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:111",
"in": "state:51",
"key": "YOUR_CENSUS_API_KEY",
}
r = requests.get(url, params=params)
data = r.json() # [[header...], [Lunenburg County, Virginia, income, pop, ...]-- 5-digit combined FIPS (state + county)
SELECT * FROM your_table WHERE county_fips = '51111';
-- Some datasets store state and county separately
SELECT * FROM your_table
WHERE state_fips = '51'
AND county_fips = '111';
-- ⚠ Never cast to integer — leading zeros are lost:
-- county_fips = 51111 is WRONG for this countylibrary(tidycensus)
get_acs(
geography = "county",
variables = c(income = "B19013_001E", pop = "B01003_001E"),
state = "51",
county = "111",
year = 2022
)ZIP Codes in Lunenburg 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 Lunenburg County. Why FIPS ≠ ZIP →
| ZIP Code | % in county |
|---|---|
| 23974 | 100.0% |
| 23944 | 100.0% |
| 23952 | 100.0% |
| 23947 | 51.7% |
| 23938 | 40.0% |
| 23942 | 38.6% |
| 23954 | 35.1% |
| 23937 | 22.4% |
| 23970 | 21.8% |
| 23924 | 9.3% |
| 23920 | 7.0% |
| 23824 | 2.7% |