Lancaster County
Virginia · County seat: Lancaster · Active county or equivalent
FIPS code 51103 is Lancaster County, Virginia. With a population of 10,866 (2022 ACS estimate), it ranks #112 in Virginia and #2417 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
51103
Population
10,866
2022 ACS · #2417 nationally
Density
81.6/mi²
people per sq mile
Land Area
133
sq miles
Urban/Rural
Nonmetro — completely rural
RUCC 9
How This FIPS Code Works
The 5-digit FIPS code 51103 is formed by combining the 2-digit state identifier 51 (Virginia) with the 3-digit county identifier 103. Together they uniquely identify Lancaster County in every US federal dataset. No two counties share the same 5-digit FIPS code.
Census ACS Data for FIPS 51103
From the 2022 ACS 5-year estimates — the same values you'd retrieve by querying the Census API with county FIPS 51103.
Median Household Income
$62,674
ACS B19013_001E
Poverty Rate
14.0%
ACS B17001 (below poverty level)
Median Age
59.2
ACS B01002_001E
Adjacent Counties (5)
Counties that share a border with Lancaster County. Useful for regional analysis — these are the geographies you'd typically include when studying labor markets, commuting zones, or environmental spillovers around FIPS 51103.
Federal Datasets Using Code 51103
FIPS code 51103 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 51103 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:103",
"in": "state:51",
"key": "YOUR_CENSUS_API_KEY",
}
r = requests.get(url, params=params)
data = r.json() # [[header...], [Lancaster County, Virginia, income, pop, ...]-- 5-digit combined FIPS (state + county)
SELECT * FROM your_table WHERE county_fips = '51103';
-- Some datasets store state and county separately
SELECT * FROM your_table
WHERE state_fips = '51'
AND county_fips = '103';
-- ⚠ Never cast to integer — leading zeros are lost:
-- county_fips = 51103 is WRONG for this countylibrary(tidycensus)
get_acs(
geography = "county",
variables = c(income = "B19013_001E", pop = "B01003_001E"),
state = "51",
county = "103",
year = 2022
)ZIP Codes in Lancaster 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 Lancaster County. Why FIPS ≠ ZIP →
| ZIP Code | % in county |
|---|---|
| 22480 | 100.0% |
| 22576 | 100.0% |
| 22578 | 100.0% |
| 22503 | 98.0% |
| 22482 | 36.4% |
| 22473 | 3.3% |