FIPS code 48423 is Smith County, Texas. With a population of 234,667 (2022 ACS estimate), it ranks #23 in Texas and #290 nationally. Smith County is part of the Tyler, TX. The state FIPS code for Texas is 48. This code is used in Census Bureau, BLS, EPA, HUD, and USDA federal datasets to identify this county.
County FIPS
48423
Population
234,667
2022 ACS · #290 nationally
Density
254.7/mi²
people per sq mile
Land Area
921
sq miles
Urban/Rural
Metro — under 250K population
RUCC 3
How This FIPS Code Works
The 5-digit FIPS code 48423 is formed by combining the 2-digit state identifier 48 (Texas) with the 3-digit county identifier 423. Together they uniquely identify Smith County in every US federal dataset. No two counties share the same 5-digit FIPS code.
Census ACS Data for FIPS 48423
From the 2022 ACS 5-year estimates — the same values you'd retrieve by querying the Census API with county FIPS 48423.
Median Household Income
$69,053
ACS B19013_001E
Poverty Rate
12.6%
ACS B17001 (below poverty level)
Median Age
37.2
ACS B01002_001E
Metropolitan Area
Adjacent Counties (7)
Counties that share a border with Smith County. Useful for regional analysis — these are the geographies you'd typically include when studying labor markets, commuting zones, or environmental spillovers around FIPS 48423.
Federal Datasets Using Code 48423
FIPS code 48423 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 48423 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:423",
"in": "state:48",
"key": "YOUR_CENSUS_API_KEY",
}
r = requests.get(url, params=params)
data = r.json() # [[header...], [Smith County, Texas, income, pop, ...]-- 5-digit combined FIPS (state + county)
SELECT * FROM your_table WHERE county_fips = '48423';
-- Some datasets store state and county separately
SELECT * FROM your_table
WHERE state_fips = '48'
AND county_fips = '423';
-- ⚠ Never cast to integer — leading zeros are lost:
-- county_fips = 48423 is WRONG for this countylibrary(tidycensus)
get_acs(
geography = "county",
variables = c(income = "B19013_001E", pop = "B01003_001E"),
state = "48",
county = "423",
year = 2022
)ZIP Codes in Smith 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 Smith County. Why FIPS ≠ ZIP →
| ZIP Code | % in county |
|---|---|
| 75792 | 100.0% |
| 75707 | 100.0% |
| 75708 | 100.0% |
| 75709 | 100.0% |
| 75711 | 100.0% |
| 75750 | 100.0% |
| 75762 | 100.0% |
| 75771 | 100.0% |
| 75791 | 100.0% |
| 75701 | 100.0% |
| 75702 | 100.0% |
| 75703 | 100.0% |
| 75704 | 100.0% |
| 75705 | 100.0% |
| 75706 | 100.0% |
| 75789 | 36.0% |
| 75647 | 32.1% |
| 75757 | 30.6% |
| 75773 | 17.6% |
| 75684 | 17.2% |
| 75662 | 7.7% |
| 75790 | 4.1% |
| 75140 | 1.8% |