FIPS code 51690 is Martinsville city, Virginia. With a population of 13,539 (2022 ACS estimate), it ranks #104 in Virginia and #2248 nationally. Martinsville city is part of the Martinsville, VA. 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
51690
Population
13,539
2022 ACS · #2248 nationally
Density
1,235.3/mi²
people per sq mile
Land Area
11
sq miles
Urban/Rural
Nonmetro — urban 20K+, adjacent to metro
RUCC 4
How This FIPS Code Works
The 5-digit FIPS code 51690 is formed by combining the 2-digit state identifier 51 (Virginia) with the 3-digit county identifier 690. Together they uniquely identify Martinsville city in every US federal dataset. No two counties share the same 5-digit FIPS code.
Census ACS Data for FIPS 51690
From the 2022 ACS 5-year estimates — the same values you'd retrieve by querying the Census API with county FIPS 51690.
Median Household Income
$39,127
ACS B19013_001E
Poverty Rate
24.6%
ACS B17001 (below poverty level)
Median Age
39.9
ACS B01002_001E
Metropolitan Area
Adjacent Counties (1)
Counties that share a border with Martinsville city. Useful for regional analysis — these are the geographies you'd typically include when studying labor markets, commuting zones, or environmental spillovers around FIPS 51690.
Federal Datasets Using Code 51690
FIPS code 51690 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 51690 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:690",
"in": "state:51",
"key": "YOUR_CENSUS_API_KEY",
}
r = requests.get(url, params=params)
data = r.json() # [[header...], [Martinsville city, Virginia, income, pop, ...]-- 5-digit combined FIPS (state + county)
SELECT * FROM your_table WHERE county_fips = '51690';
-- Some datasets store state and county separately
SELECT * FROM your_table
WHERE state_fips = '51'
AND county_fips = '690';
-- ⚠ Never cast to integer — leading zeros are lost:
-- county_fips = 51690 is WRONG for this countylibrary(tidycensus)
get_acs(
geography = "county",
variables = c(income = "B19013_001E", pop = "B01003_001E"),
state = "51",
county = "690",
year = 2022
)ZIP Codes in Martinsville city
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 Martinsville city. Why FIPS ≠ ZIP →
| ZIP Code | % in county |
|---|---|
| 24112 | 7.2% |