FIPS code 48339 is Montgomery County, Texas. With a population of 629,989 (2022 ACS estimate), it ranks #11 in Texas and #107 nationally. Montgomery County is part of the Houston-Pasadena-The Woodlands, 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
48339
Population
629,989
2022 ACS · #107 nationally
Density
604.8/mi²
people per sq mile
Land Area
1,042
sq miles
Urban/Rural
Metro — 1M+ population
RUCC 1
How This FIPS Code Works
The 5-digit FIPS code 48339 is formed by combining the 2-digit state identifier 48 (Texas) with the 3-digit county identifier 339. Together they uniquely identify Montgomery County in every US federal dataset. No two counties share the same 5-digit FIPS code.
Census ACS Data for FIPS 48339
From the 2022 ACS 5-year estimates — the same values you'd retrieve by querying the Census API with county FIPS 48339.
Median Household Income
$95,946
ACS B19013_001E
Poverty Rate
8.8%
ACS B17001 (below poverty level)
Median Age
37.4
ACS B01002_001E
Metropolitan Area
Adjacent Counties (6)
Counties that share a border with Montgomery County. Useful for regional analysis — these are the geographies you'd typically include when studying labor markets, commuting zones, or environmental spillovers around FIPS 48339.
Federal Datasets Using Code 48339
FIPS code 48339 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 48339 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:339",
"in": "state:48",
"key": "YOUR_CENSUS_API_KEY",
}
r = requests.get(url, params=params)
data = r.json() # [[header...], [Montgomery County, Texas, income, pop, ...]-- 5-digit combined FIPS (state + county)
SELECT * FROM your_table WHERE county_fips = '48339';
-- Some datasets store state and county separately
SELECT * FROM your_table
WHERE state_fips = '48'
AND county_fips = '339';
-- ⚠ Never cast to integer — leading zeros are lost:
-- county_fips = 48339 is WRONG for this countylibrary(tidycensus)
get_acs(
geography = "county",
variables = c(income = "B19013_001E", pop = "B01003_001E"),
state = "48",
county = "339",
year = 2022
)ZIP Codes in Montgomery 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 Montgomery County. Why FIPS ≠ ZIP →
| ZIP Code | % in county |
|---|---|
| 77381 | 100.0% |
| 77302 | 100.0% |
| 77303 | 100.0% |
| 77304 | 100.0% |
| 77306 | 100.0% |
| 77354 | 100.0% |
| 77301 | 100.0% |
| 77382 | 100.0% |
| 77362 | 100.0% |
| 77380 | 100.0% |
| 77318 | 100.0% |
| 77386 | 100.0% |
| 77385 | 100.0% |
| 77384 | 100.0% |
| 77356 | 97.7% |
| 77365 | 96.2% |
| 77316 | 96.1% |
| 77355 | 90.1% |
| 77372 | 87.5% |
| 77357 | 82.0% |
| 77378 | 60.5% |
| 77873 | 43.6% |
| 77339 | 24.1% |
| 77328 | 21.7% |
| 77358 | 6.5% |
| 77447 | 4.9% |
| 77327 | 0.1% |