Get API Key →
US ZIP Code Profile

ZIP Code 75831
Buffalo, Texas

ZIP code 75831 is in Buffalo, located in Leon County, Texas. Its 2020 Census population was 4,865. The estimated median adjusted gross income per tax return is $44,000, and about 4% of filers report $200,000 or more.

2020 Population
4,865
Census ZCTA
County
Leon
FIPS 48289
Median income (est.)
$44,000
IRS SOI 2022
Land Area
255.151 mi²
+ 1.344 mi² water

01Location & Geography

Authoritative geographic identifiers from the U.S. Census Bureau, ANSI, and FIPS standards.

Primary CityBuffalo, TX
CountyLeon County (FIPS 48289)
StateTexas (FIPS 48)
Census Region / DivisionSouth Region · West South Central Division
Coordinates31.473667, -96.00936
Land / Water Area255.151 mi² land · 1.344 mi² water

02Income & Economics

Distribution of the 2,160 individual tax returns filed in 75831 by adjusted gross income bracket (IRS SOI, 2022).

< $25K
32.4%
$25K–$50K
23.2%
$50K–$75K
15.3%
$75K–$100K
9.3%
$100K–$200K
15.7%
$200K+
4.2%
The $200,000+ bracket accounts for 24% of 75831's total adjusted gross income, from 4% of returns — a concentration that drives the gap between the median ($44,000) and the average.
Estimated median = median adjusted gross income per tax return, interpolated from IRS SOI brackets. Differs from U.S. Census household income.

03Income Over Time

Year-over-year change in 75831's IRS income metrics, 2020–2022.

Median income (2021→2022)
$44,000
▲ 12.4%
Filers earning $200K+
4.2%
▲ 1.3 pt
Total filers
2,160
▲ 1.9%
GET /zipc/v2/zipcodes/75831/soi?year=… $38K 2020 $39K 2021 $44K 2022
Median = adjusted gross income per return, interpolated from IRS SOI brackets. Figures are nominal (not inflation-adjusted).

04Population Trend

Decennial U.S. Census population for the 75831 ZCTA.

2000
4,819
 
2010
5,386
▲ +11.8%
2020
4,865
▼ -9.7%

05USPS Postal Details

Delivery and facility attributes from the monthly USPS dataset.

ZIP ClassificationNon-Unique Zip
Facility TypePost Office
Carrier Route SortC
USPS Finance Number481195
City AliasesBuffalo, Flo, Keechi, Lanely

06Frequently Asked Questions

What county is ZIP code 75831 in?

ZIP code 75831 is in Leon County, Texas (county FIPS code 48289).

What city is ZIP code 75831?

The primary USPS city for 75831 is Buffalo, TX.

What is the population of ZIP code 75831?

The 2020 Census population of 75831 was 4,865 residents.

What is the median income in ZIP code 75831?

Based on IRS Statistics of Income data, the estimated median adjusted gross income per tax return in 75831 is about $44,000, with around 4% of filers reporting $200,000 or more. Note that adjusted gross income is a tax measure and differs from U.S. Census household income.