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US ZIP Code Profile

ZIP Code 77378
Willis, Texas

ZIP code 77378 is in Willis, located in Montgomery County, Texas, within the Houston-The Woodlands-Sugar Land metro area. Its 2020 Census population was 17,417. The estimated median adjusted gross income per tax return is $42,103, and about 4% of filers report $200,000 or more.

2020 Population
17,417
Census ZCTA
County
Montgomery
FIPS 48339
Median income (est.)
$42,103
IRS SOI 2022
Land Area
97.246 mi²
+ 0.511 mi² water

01Location & Geography

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

Primary CityWillis, TX
CountyMontgomery County (FIPS 48339)
StateTexas (FIPS 48)
Metro Area (MSA)Houston-The Woodlands-Sugar Land, TX Metro Area (26420)
Census Region / DivisionSouth Region · West South Central Division
Coordinates30.47137, -95.36387
Land / Water Area97.246 mi² land · 0.511 mi² water

02Income & Economics

Distribution of the 8,770 individual tax returns filed in 77378 by adjusted gross income bracket (IRS SOI, 2022).

< $25K
31.4%
$25K–$50K
27.3%
$50K–$75K
14.8%
$75K–$100K
9.5%
$100K–$200K
13.0%
$200K+
4.1%
The $200,000+ bracket accounts for 32% of 77378's total adjusted gross income, from 4% of returns — a concentration that drives the gap between the median ($42,103) 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 77378's IRS income metrics, 2020–2022.

Median income (2021→2022)
$42,103
▲ 9.0%
Filers earning $200K+
4.1%
▲ 1.0 pt
Total filers
8,770
▲ 4.3%
GET /zipc/v2/zipcodes/77378/soi?year=… $36K 2020 $39K 2021 $42K 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 77378 ZCTA.

2000
10,489
 
2010
14,685
▲ +40.0%
2020
17,417
▲ +18.6%

05USPS Postal Details

Delivery and facility attributes from the monthly USPS dataset.

ZIP ClassificationNon-Unique Zip
Facility TypePost Office
Carrier Route SortD
USPS Finance Number489740
City AliasesWillis

06Frequently Asked Questions

What county is ZIP code 77378 in?

ZIP code 77378 is in Montgomery County, Texas (county FIPS code 48339).

What city is ZIP code 77378?

The primary USPS city for 77378 is Willis, TX.

What metro area (MSA) is 77378 in?

77378 is part of the Houston-The Woodlands-Sugar Land, TX Metro Area (MSA code 26420).

What is the population of ZIP code 77378?

The 2020 Census population of 77378 was 17,417 residents.

What is the median income in ZIP code 77378?

Based on IRS Statistics of Income data, the estimated median adjusted gross income per tax return in 77378 is about $42,103, 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.