77378 ZIP Code, Willis, TX
77378 is a ZIP code in Willis, Texas — mostly in Montgomery County (61% of its land), with smaller parts in San Jacinto County. It covers 89 square miles of land, centered about 50 miles north of downtown Houston. The closest ZIP codes are 77358, 77303 and 77318. 17,629 people live here in 5,924 households. With about 198 people per square mile it is lightly settled, and most homes are owner-occupied (75%). Median household income is $71,143, close to the Texas median of $78,476.
Quick facts
- Mailing city: Willis, TX
- County: Montgomery County
- Metro area: Houston
- Land area: 89 sq mi
- Population: 17,629
- Median household income: $71,143
- Carrier routes: 12 (8,756 homes)
Key figures
| Measure | Value |
|---|---|
| Residents | 17,629 |
| Households | 5,924 |
| Median household income | $71,143 |
| Income per person | $31,889 |
| Median age | 35.1 |
| Homeowners | 74.5% |
| Median home value | $199,800 |
| Median rent | $1,532 |
| Bachelor's degree or higher | 18.4% |
| Average commute (minutes) | 34 |
| Households with kids under 18 | 35.9% |
| Moved in the past year | 9.1% |
| Below the poverty line | 10.6% |
| Broadband internet | 90.6% |
| Speak a non-English language at home | 24.6% |
Household income
| % of households | Value |
|---|---|
| <$10K | 5.1% |
| $10–15K | 2.0% |
| $15–25K | 6.6% |
| $25–35K | 4.8% |
| $35–50K | 8.2% |
| $50–75K | 27.4% |
| $75–100K | 13.9% |
| $100–150K | 19.3% |
| $150–200K | 7.2% |
| $200K+ | 5.5% |
Age
| % of all residents | Value |
|---|---|
| <10 | 14.3% |
| 10–19 | 13.7% |
| 20–24 | 7.6% |
| 25–34 | 14.1% |
| 35–44 | 16.0% |
| 45–54 | 7.3% |
| 55–64 | 13.4% |
| 65–74 | 9.8% |
| 75+ | 3.7% |
Tenure
| % of housing units | Value |
|---|---|
| Owned, with mortgage | 36.7% |
| Owned outright | 35.0% |
| Rented | 24.3% |
| Vacant | 4.0% |
Type of building
| % of housing units | Value |
|---|---|
| Detached house | 68.4% |
| Townhome | 1.2% |
| 2–4 units | 1.4% |
| 5–19 units | 2.5% |
| 20+ units | 0.0% |
| Mobile / other | 26.4% |
Businesses in 77378
287 business establishments with 3,061 employees (ZIP Codes Business Patterns 2023).
- Construction: 60
- Retail Trade: 34
- Accommodation and Food Services: 28
- Other Services (except Public Administration): 27
- Manufacturing: 23
- Administrative and Support and Waste Management and Remediation Services: 21
- Professional, Scientific, and Technical Services: 19
- Transportation and Warehousing: 18
EDDM carrier routes
77378 has 12 USPS carrier routes with 8,756 residential and 347 business mailboxes. Open the EDDM route map.
Carrier routes in 77378
77378 has 12 USPS carrier routes (12 rural (R)) with 8,756 residential and 347 business mailboxes. Routes range from 422 homes (R011) to 1,333 homes (R026); the median route has 705 homes. The Census counted 5,924 households in 77378 (2020–2024 average); USPS counts current mailboxes, including new and vacant homes.
| Homes per route | Routes |
|---|---|
| 1–249 | 0 |
| 250–499 | 2 |
| 500–749 | 5 |
| 750–999 | 4 |
| 1,000–1,499 | 1 |
| 1,500+ | 0 |
Best routes in 77378 for…
Highest income
For bigger-ticket offers: remodeling, pools, financial planning, private schools.
- Route R003 — Est. median household income $88,363, 818 homes
- Route R012 — Est. median household income $82,046, 526 homes
- Route R002 — Est. median household income $80,034, 579 homes
- Route R022 — Est. median household income $77,990, 844 homes
- Route R005 — Est. median household income $73,237, 736 homes
Select these 5 routes on the route map
Often mailed by: Home services EDDM, Real estate EDDM postcards, Landscaping and lawn care mailers
Most families with kids
For tutoring, youth sports, pediatric dental, child care and family dining.
- Route R003 — Est. families with children under 18 43.7%, 818 homes
- Route R018 — Est. families with children under 18 40.0%, 845 homes
- Route R002 — Est. families with children under 18 39.8%, 579 homes
- Route R022 — Est. families with children under 18 39.4%, 844 homes
- Route R009 — Est. families with children under 18 36.7%, 580 homes
Select these 5 routes on the route map
Often mailed by: Dental practice EDDM, Healthcare and clinic mailers
Most homeowners
Owners decide on roofs, HVAC, lawns, solar and insurance; renters usually can't.
- Route R002 — Est. owner-occupied homes 90.3%, 579 homes
- Route R020 — Est. owner-occupied homes 89.6%, 673 homes
- Route R012 — Est. owner-occupied homes 86.9%, 526 homes
- Route R009 — Est. owner-occupied homes 86.5%, 580 homes
- Route R005 — Est. owner-occupied homes 80.3%, 736 homes
Select these 5 routes on the route map
Often mailed by: Roofing direct mail, HVAC postcards
Most new movers
New residents are still choosing a dentist, a gym and a lawn service.
- Route R014 — Est. residents who moved in the past year 15.7%, 457 homes
- Route R003 — Est. residents who moved in the past year 15.4%, 818 homes
- Route R026 — Est. residents who moved in the past year 8.7%, 1,333 homes
- Route R011 — Est. residents who moved in the past year 8.7%, 422 homes
- Route R018 — Est. residents who moved in the past year 7.7%, 845 homes
Select these 5 routes on the route map
Often mailed by: Restaurant EDDM menus and offers, Gym and fitness mailers
Newest homes
Newer subdivisions: landscaping, window treatments, fencing, security, home warranties.
- Route R011 — Est. homes built 2010 or later 41.1%, 422 homes
- Route R022 — Est. homes built 2010 or later 40.4%, 844 homes
- Route R020 — Est. homes built 2010 or later 34.2%, 673 homes
- Route R026 — Est. homes built 2010 or later 29.1%, 1,333 homes
- Route R014 — Est. homes built 2010 or later 25.5%, 457 homes
Select these 5 routes on the route map
Most businesses
For B2B offers: office supplies, cleaning, IT, catering and commercial services.
- Route R014 — USPS business mailboxes 111, 457 homes
- Route R011 — USPS business mailboxes 104, 422 homes
- Route R024 — USPS business mailboxes 34, 943 homes
- Route R018 — USPS business mailboxes 18, 845 homes
- Route R005 — USPS business mailboxes 17, 736 homes
Select these 5 routes on the route map
Every carrier route in 77378
| Route | Type | Homes | Businesses | Est. median income | Est. owners | Est. families with kids | Est. moved in past year |
|---|---|---|---|---|---|---|---|
| R002 | Rural | 579 | 6 | $80,034 | 90.3% | 39.8% | 4.1% |
| R003 | Rural | 818 | 8 | $88,363 | 79.4% | 43.7% | 15.4% |
| R005 | Rural | 736 | 17 | $73,237 | 80.3% | 27.7% | 6.4% |
| R009 | Rural | 580 | 5 | $71,715 | 86.5% | 36.7% | 4.0% |
| R011 | Rural | 422 | 104 | $66,173 | 63.7% | 35.7% | 8.7% |
| R012 | Rural | 526 | 14 | $82,046 | 86.9% | 19.2% | 6.6% |
| R014 | Rural | 457 | 111 | $33,991 | 39.4% | 31.7% | 15.7% |
| R018 | Rural | 845 | 18 | $60,514 | 67.2% | 40.0% | 7.7% |
| R020 | Rural | 673 | 12 | $71,009 | 89.6% | 26.8% | 6.7% |
| R022 | Rural | 844 | 9 | $77,990 | 72.6% | 39.4% | 2.9% |
| R024 | Rural | 943 | 34 | $67,506 | 78.9% | 30.4% | 5.9% |
| R026 | Rural | 1,333 | 9 | $67,662 | 73.5% | 30.5% | 8.7% |
Income, owners, families and movers are estimates for each route (how we estimate them); mailbox counts are current USPS figures. Open 77378 on the EDDM route map.
How route demographics are estimated
Mailbox counts come from USPS; demographics are estimates
The number of homes and businesses on each carrier route is the current USPS EDDM count. The Census Bureau does not publish figures for carrier routes, so income, homeownership, ages, families, movers and housing age on a route are EDDM2GO estimates built from Census block groups (neighborhood areas of roughly 600 to 3,000 people).
How a route gets its figures: the block-group length-share method
We trace each route's streets every 25 meters and record which block group each stretch falls in. The route's homes are spread along its streets in proportion to length, so a route with 60% of its street length in one block group is assumed to have 60% of its homes there. Each block group then contributes its Census counts in proportion to the share of its housing units that sit on the route (capped at the whole block group). Medians are recalculated from the combined income, home-value and age brackets, the way the Census Bureau computes them, not averaged.
Margins of error
Census survey figures carry a margin of error at 90% confidence; we carry it through the calculation and show it as ±. Our margins treat the route-to-block-group split as exact, so the real uncertainty is larger. Routes with fewer than 100 estimated households, large margins, or streets we could not place are flagged.
Different years
USPS mailbox counts are current. Census figures are 5-year averages for 2020–2024, so a new subdivision may have more homes on the route today than the Census counted. Use the route figures to compare routes with each other, not as an exact head count.
Why some routes show identical figures
Two routes that run through the same block group get the same percentages and medians, because the Census publishes one set of figures for the whole block group. Their mailbox counts still differ, and those are exact.
Route and mailbox counts: USPS EDDM route data. Route demographics: EDDM2GO estimates from U.S. Census Bureau American Community Survey 5-year block-group data (2020–2024) and 2024 cartographic block-group boundaries. This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.
Nearby ZIP codes
- 77358 — New Waverly city, TX (5.7 mi)
- 77303 — Conroe city, TX (6.9 mi)
- 77318 — Conroe city, TX (10.2 mi)
- 77301 — Conroe city, TX (12 mi)
- 77328 — Cleveland city, TX (12.5 mi)
- 77304 — Conroe city, TX (13 mi)
- 77306 — Grangerland CDP, TX (14 mi)
- 77340 — Huntsville city, TX (15.1 mi)
Areas that include 77378
- Willis, TX ZIP codes — 2 ZIP codes
- Montgomery County ZIP codes — 24 ZIP codes
- San Jacinto County ZIP codes — 7 ZIP codes
- Houston ZIP code map — 238 ZIP codes
- Texas ZIP code data
Where it ranks
Mail every home in 77378
Route counts on this page price as Full Service 6.5 × 9 postcards: we print, bundle by carrier route and hand the mailing to USPS. Prefer to take it to the Post Office yourself? Print only costs less and you pay postage at drop-off.
EDDM guides
ZIP code statistics describe the Census ZIP Code Tabulation Area (ZCTA) 77378, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.
Frequently asked questions
- What city is 77378 in?
- 77378 is a Willis, TX mailing address. By land area, 4% lies inside Willis and 1% lies inside Conroe; the rest is outside any Census-defined city or community.
- What county is 77378 in?
- 77378 is mostly in Montgomery County (61% of its land), with smaller parts in San Jacinto County.
- What is the population of 77378?
- About 17,629 people (±1,451), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 17,417.
- What is the median household income in 77378?
- $71,143 (±$4,129), compared with $78,476 for Texas as a whole. Half the households in the ZIP code earn more and half earn less.
- How many carrier routes and mailboxes are in 77378?
- 12 USPS carrier routes with 8,756 residential and 347 business mailboxes (9,115 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.
- What ZIP codes are near 77378?
- The closest, measured center to center: 77358 (5.7 mi, New Waverly), 77303 (6.9 mi, Conroe), 77318 (10.2 mi, Conroe), 77301 (12 mi, Conroe), 77328 (12.5 mi, Cleveland) and 77304 (13 mi, Conroe).
This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.