77378 ZIP Code — Willis, TX

Montgomery County, Texas

ZIP code 77378 is located in Willis, Texas, within Montgomery County. It covers approximately 89.11 square miles and serves a population of 18,112 residents. This is a standard ZIP code in the Central (CT) timezone, served by area code 936.

About ZIP code 77378

The housing stock consists of a higher-than-average concentration of mobile homes. Most homes were built in the 2000s, giving the area an established character. Median home value is $149,500. Owner-occupancy is high at 78%, well above the national average.

The gap between median ($66,882) and mean household income suggests income inequality — a small number of higher earners pull the average up. 31% of households receive Social Security income, suggesting a notable retiree or disability population.

The dominant occupation class is management, business, and professional, with education and healthcare as the leading industry. The average commute of 33 minutes is near the national average.

College attainment at 16% is below the national average, consistent with a trades and production-oriented local economy.

Health indicators show elevated rates of smoking (23%) compared to national benchmarks. 29% of residents lack health insurance, above the national average.

Overall, ZIP code 77378 reflects a community defined by a trades-oriented workforce, high homeownership, and a significant Social Security-dependent population.

18,112

population

89.11

sq mi land

Standard

ZIP type

Central (CT)

timezone

77378 ZIP code map

Cities in ZIP code 77378

Below are the cities the US Postal Service accepts for ZIP code 77378. Using any city not on this list may result in mail delivery delays.

City	Status
Willis	Preferred

Nearby ZIP codes

77303 Conroe (5.1 mi) 77358 New Waverly (8.4 mi) 77318 Willis (9.4 mi) 77301 Conroe (10.8 mi) 77328 Cleveland (12 mi) 77304 Conroe (12.4 mi) 77306 Conroe (13.5 mi) 77302 Conroe (16 mi) 77340 Huntsville (17 mi) 77384 Conroe (17.1 mi) 77331 Coldspring (17.4 mi) 77359 Oakhurst (17.6 mi)

Demographics updated 07/2026

Population
Total population	18,112
Population density	203 / sq mi
State FIPS	48
County FIPS	339

Geography
Land area	89.11 sq mi
Water area	0.50 sq mi
Latitude	30.4545
Longitude	-95.3829
Timezone	Central (CT)
Area code	936

Total population by age

Gender

Race & ethnicity

Economics updated 07/2026

Household income

Income range	This ZIP	County avg	State avg
Under $50k	37.7%	28.9%	39.5%
$50k – $100k	39.5%	28.4%	30.1%
$100k – $200k	16.7%	28.4%	22.6%
Over $200k	6.2%	14.3%	7.8%

Demographics & statistics

18,112

Population

203

People per sq mi

37.6

Median age

$66,882

Median household income

$32,711

Per capita income

$149,500

Median home value

$1,324

Median monthly rent

78.2%

Home ownership

9.1%

Poverty rate

5.1%

Unemployment

4,977

Housing units

15.7%

Bachelor's or higher

Age distribution

Male Female

373

Under 5

381

779

5–9

795

499

10–14

508

817

15–19

833

687

20–24

701

1,029

25–34

1,049

1,425

35–44

1,452

1,008

45–54

1,027

413

55–59

420

821

60–64

836

815

65–74

830

247

75–84

252

85+

← Male

Female →

Age summary

Group	Count	%
Under 18	4,245	23.4%
18 and over	13,867	76.6%
65 and over	2,259	12.5%
Median age	37.6 years

Race & ethnicity

White 57%

Hispanic or Latino 18.6%

Two or more races 11.6%

Other race 8.5%

Black or African American 3.6%

American Indian / Alaska Native 0.7%

Group	Count	%
White	12,691	57%
Hispanic or Latino	4,135	18.6%
Two or more races	2,571	11.6%
Other race	1,893	8.5%
Black or African American	798	3.6%
American Indian / Alaska Native	159	0.7%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	37.7%	28.9%	39.5%
$50k – $100k	39.5%	28.4%	30.1%
$100k – $200k	16.7%	28.4%	22.6%
Over $200k	6.2%	14.3%	7.8%

Under $10k 4.9%

$10k–$15k 1.4%

$15k–$25k 3.8%

$25k–$35k 10.1%

$35k–$50k 10.0%

$50k–$75k 27.9%

$75k–$100k 13.4%

$100k–$150k 12.4%

$150k–$200k 6.9%

$200k+ 9.2%

Range	% of households
Under $10k	4.9%
$10k–$15k	1.4%
$15k–$25k	3.8%
$25k–$35k	10.1%
$35k–$50k	10.0%
$50k–$75k	27.9%
$75k–$100k	13.4%
$100k–$150k	12.4%
$150k–$200k	6.9%
$200k+	9.2%
Median income	$66,882

Housing

Home values

Under $50k 5.7%

$50k–$100k 22.0%

$100k–$150k 22.5%

$150k–$200k 13.2%

$200k–$300k 16.3%

$300k–$500k 14.1%

$500k–$1M 5.5%

$1M+ 0.7%

Housing overview

Metric	Value
Median home value	$149,500
Median rent / month	$1,324
Owner occupied	78.2%
Renter occupied	21.8%
Vacant	7.1%
Single-family detached	67.8%
Large apartment buildings	0.0%
Mobile homes	27.9%
Median rooms	5.2
Avg household size (owned)	3.07

Year built

Era	%
2020 or later	1.1%
2010–2019	13.0%
2000–2009	23.9%
1990–1999	21.5%
1980–1989	22.7%
1970–1979	10.8%
1960–1969	4.3%
1950–1959	1.7%
1940–1949	1.1%
1939 or earlier	0.0%

Bedrooms

Size	% of units
No bedroom (studio)	0.1%
1 bedroom	3.0%
2 bedrooms	22.7%
3 bedrooms	55.4%
4 bedrooms	16.0%
5+ bedrooms	2.8%

Vehicles per household

Vehicles	% of households
No vehicle	3.4%
1 vehicle	29.2%
2 vehicles	39.2%
3 or more	28.2%

Heating fuel

Fuel type	%
Utility gas	13.1%
Electricity	80.0%
Propane / LP gas	4.9%
Solar	0.9%
No fuel used	1.2%

Households & families

Household type	Count	%
Married-couple family	3,526	60.8%
Cohabiting couple	326	5.6%
Male householder, no spouse	1,066	18.4%
Female householder, no spouse	879	15.2%
Households with children under 18	2,041	35.2%
Households with seniors (65+)	1,731	29.9%
Average household size	3.10

Marital status

Status	Male	Female
Never married	33.9%	31.8%
Married	53.7%	54.6%
Separated	3.7%	1.1%
Widowed	1.4%	4.0%
Divorced	7.4%	8.5%

Education

Less than 9th grade 7.3%

Some HS, no diploma 13.3%

HS graduate 35.3%

Some college, no degree 21.7%

Associate's degree 6.8%

Bachelor's degree 12.1%

Graduate / professional 3.6%

Metric	%
HS diploma or higher	79.4%
Bachelor's or higher	15.7%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	82	1.9%
Kindergarten	202	4.8%
Elementary school	2,183	51.4%
High school	972	22.9%
College / grad school	804	18.9%

Employment

Industry of employment

Education & healthcare 25.0%

Construction 18.1%

Arts, food & hospitality 10.1%

Retail trade 9.4%

Professional & management 8.6%

Manufacturing 7.0%

Transportation & utilities 6.5%

Public administration 4.2%

Wholesale trade 4.1%

Other services 4.0%

Agriculture & mining 2.1%

Finance & real estate 0.8%

Occupation

Category	%
Management, business & arts	25.7%
Service	25.2%
Sales & office	17.0%
Natural resources & construction	15.7%
Production & transportation	16.5%

Employment type

Type	%
Private sector	69.2%
Government	16.9%
Self-employed	13.9%
Unpaid family workers	0.0%

Commute

Method	%
Drive alone	71.5%
Carpool	17.6%
Public transit	0.0%
Walk	0.5%
Work from home	7.8%
Other means	2.6%
Avg commute (minutes)	33.1

Poverty

All people 9.1%

Under 18 years 15.5%

18 and over 7.1%

Married-couple families 3.4%

Female-led households 25.8%

Income support

Source	% of households
Social Security	30.6%
Retirement income	22.1%
Supplemental Security	3.6%
Cash public assistance	2.3%
Food stamps / SNAP	12.3%

Health indicators

Condition	%
Obesity	37.3%
High blood pressure	34.3%
High cholesterol	34.4%
Diabetes	12.0%
Heart disease	6.5%
Stroke	3.3%
Asthma	10.1%
Arthritis	22.6%
Kidney disease	3.0%
Pulmonary disease	8.0%
Cancer	5.3%

Behavior / access	%
Smoking	23.3%
Binge drinking	18.2%
No physical activity	30.9%
Less than 7 hrs sleep	37.1%
Depression	24.2%
Fair or poor health	20.7%
Poor mental health	17.9%
Poor physical health	13.1%
No health insurance	32.1%
Visited doctor (checkup)	68.7%
Visited dentist	47.9%
Cholesterol screening	85.5%
Teeth loss	19.6%

Veterans & disability

Veterans	Count	%
Civilian veterans	662	4.8%

Disability	%
Any disability	12.4%
Under 18	5.5%
18–64 years	12.2%
65 and over	26.6%

Health insurance coverage

Type	%
Private insurance	51.4%
Public insurance	29.8%
No insurance	29.1%
Uninsured under 19	25.5%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	17,358	95.8%
Spanish	2,944	17.0%
Other Indo-European	2,944	17.0%
Asian & Pacific Islander	0	0.0%
Other languages	0	0.0%

Place of birth & citizenship

Origin	Count	%
Native born (US)	14,262	78.7%
Born in same state	13,686	75.6%
Born in different state	10,117	55.9%
Foreign born	576	3.2%
Naturalized citizen	3,850	21.3%
Not a US citizen	837	21.7%

Ancestry

Ancestry	Count	%
French	1,640	9.1%
Arab	1,157	6.4%
Italian	1,033	5.7%

Ancestry	Count	%
English	245	1.4%
Polish	83	0.5%

Technology access

Metric	% of households
Computer access	32.0%
Internet access	97.6%

Source: U.S. Census Bureau, American Community Survey 2025 estimates.

Frequently asked questions about ZIP code 77378

What city is ZIP code 77378 in?

ZIP code 77378 is primarily assigned to Willis, Texas.

What county is ZIP code 77378 in?

ZIP code 77378 falls within Montgomery County, Texas.

What is the typical home value in ZIP code 77378?

The median home value in ZIP code 77378 is $149,500.

What is the population of ZIP code 77378?

ZIP code 77378 has an estimated population of 18,112 residents, with a density of 203 people per square mile.

What is the median household income in ZIP code 77378?

The median household income in ZIP code 77378 is $66,882, below the national median of ~$75,000.

What timezone is ZIP code 77378 in?

ZIP code 77378 observes the CST timezone.