Get API Key →
US ZIP Code Profile

ZIP Code 75840
Fairfield, Texas

ZIP code 75840 is in Fairfield, located in Freestone County, Texas. Its 2020 Census population was 7,029. The estimated median adjusted gross income per tax return is $44,444, and about 4% of filers report $200,000 or more.

2020 Population
7,029
Census ZCTA
County
Freestone
FIPS 48161
Median income (est.)
$44,444
IRS SOI 2022
Land Area
273.323 mi²
+ 4.446 mi² water

01Location & Geography

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

Primary CityFairfield, TX
CountyFreestone County (FIPS 48161)
StateTexas (FIPS 48)
Census Region / DivisionSouth Region · West South Central Division
Coordinates31.782558, -96.09362
Land / Water Area273.323 mi² land · 4.446 mi² water

02Income & Economics

Distribution of the 3,200 individual tax returns filed in 75840 by adjusted gross income bracket (IRS SOI, 2022).

< $25K
32.5%
$25K–$50K
22.5%
$50K–$75K
14.7%
$75K–$100K
9.7%
$100K–$200K
16.2%
$200K+
4.4%
The $200,000+ bracket accounts for 25% of 75840's total adjusted gross income, from 4% of returns — a concentration that drives the gap between the median ($44,444) 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 75840's IRS income metrics, 2020–2022.

Median income (2021→2022)
$44,444
▲ 7.1%
Filers earning $200K+
4.4%
▲ 1.0 pt
Total filers
3,200
▼ 2.1%
GET /zipc/v2/zipcodes/75840/soi?year=… $40K 2020 $42K 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 75840 ZCTA.

2000
6,622
 
2010
7,076
▲ +6.9%
2020
7,029
▼ -0.7%

05USPS Postal Details

Delivery and facility attributes from the monthly USPS dataset.

ZIP ClassificationNon-Unique Zip
Facility TypePost Office
Carrier Route SortD
USPS Finance Number482995
City AliasesFairfield, Grindstone, Turlington, Ward Prairie, Young

06Frequently Asked Questions

What county is ZIP code 75840 in?

ZIP code 75840 is in Freestone County, Texas (county FIPS code 48161).

What city is ZIP code 75840?

The primary USPS city for 75840 is Fairfield, TX.

What is the population of ZIP code 75840?

The 2020 Census population of 75840 was 7,029 residents.

What is the median income in ZIP code 75840?

Based on IRS Statistics of Income data, the estimated median adjusted gross income per tax return in 75840 is about $44,444, 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.