78140 ZIP Code, Nixon, TX
78140 is a ZIP code in Nixon, Texas — mostly in Gonzales County (68% of its land), with smaller parts in Wilson, Guadalupe and Karnes counties. It covers 175 square miles of land. The closest ZIP codes are 78143, 78160 and 78677. 3,474 people live here in 1,278 households. It is rural, with fewer than 100 people per square mile, and most homes are owner-occupied (74%). Median household income is $50,250, well below the Texas median of $78,476; 45% of households have children under 18.
Quick facts
- Mailing city: Nixon, TX
- County: Gonzales County
- Land area: 175 sq mi
- Population: 3,474
- Median household income: $50,250
- Carrier routes: 4 (1,384 homes)
Key figures
| Measure | Value |
|---|---|
| Residents | 3,474 |
| Households | 1,278 |
| Median household income | $50,250 |
| Income per person | $27,798 |
| Median age | 36.2 |
| Homeowners | 73.5% |
| Median home value | $85,200 |
| Median rent | $845 |
| Bachelor's degree or higher | 6.2% |
| Average commute (minutes) | 26.4 |
| Households with kids under 18 | 45.1% |
| Moved in the past year | 8.3% |
| Below the poverty line | 12.0% |
| Broadband internet | 86.9% |
| Speak a non-English language at home | 42.6% |
Household income
| % of households | Value |
|---|---|
| <$10K | 2.2% |
| $10–15K | 14.2% |
| $15–25K | 7.4% |
| $25–35K | 12.2% |
| $35–50K | 13.3% |
| $50–75K | 17.9% |
| $75–100K | 8.8% |
| $100–150K | 11.0% |
| $150–200K | 6.2% |
| $200K+ | 6.7% |
Age
| % of all residents | Value |
|---|---|
| <10 | 15.6% |
| 10–19 | 17.2% |
| 20–24 | 4.9% |
| 25–34 | 11.2% |
| 35–44 | 11.6% |
| 45–54 | 11.3% |
| 55–64 | 10.7% |
| 65–74 | 10.2% |
| 75+ | 7.2% |
Tenure
| % of housing units | Value |
|---|---|
| Owned, with mortgage | 22.9% |
| Owned outright | 43.7% |
| Rented | 24.0% |
| Vacant | 9.4% |
Type of building
| % of housing units | Value |
|---|---|
| Detached house | 67.0% |
| Townhome | 0.0% |
| 2–4 units | 3.8% |
| 5–19 units | 1.9% |
| 20+ units | 0.0% |
| Mobile / other | 27.4% |
Businesses in 78140
50 business establishments with 776 employees (ZIP Codes Business Patterns 2023).
- Other Services (except Public Administration): 9
- Accommodation and Food Services: 8
- Retail Trade: 7
- Finance and Insurance: 6
- Construction: 5
- Professional, Scientific, and Technical Services: 4
- Manufacturing: 3
- Administrative and Support and Waste Management and Remediation Services: 3
EDDM carrier routes
78140 has 4 USPS carrier routes with 1,384 residential and 66 business mailboxes. Open the EDDM route map.
Carrier routes in 78140
78140 has 4 USPS carrier routes (1 city (C), 1 rural (R), 2 highway contract (H)) with 1,384 residential and 66 business mailboxes. Routes range from 40 homes (H002) to 878 homes (C004); the median route has 233 homes. The Census counted 1,278 households in 78140 (2020–2024 average); USPS counts current mailboxes, including new and vacant homes.
| Homes per route | Routes |
|---|---|
| 1–249 | 2 |
| 250–499 | 1 |
| 500–749 | 0 |
| 750–999 | 1 |
| 1,000–1,499 | 0 |
| 1,500+ | 0 |
Best routes in 78140 for…
Highest income
For bigger-ticket offers: remodeling, pools, financial planning, private schools.
- Route H040 — Est. median household income $76,165, 132 homes
- Route R001 — Est. median household income $74,825, 334 homes
- Route C004 — Est. median household income $35,266, 878 homes
Select these 3 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 H040 — Est. families with children under 18 41.8%, 132 homes
- Route C004 — Est. families with children under 18 39.3%, 878 homes
- Route R001 — Est. families with children under 18 33.7%, 334 homes
Select these 3 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 R001 — Est. owner-occupied homes 80.7%, 334 homes
- Route H040 — Est. owner-occupied homes 79.2%, 132 homes
- Route C004 — Est. owner-occupied homes 69.0%, 878 homes
Select these 3 routes on the route map
Often mailed by: Roofing direct mail, HVAC postcards
Newest homes
Newer subdivisions: landscaping, window treatments, fencing, security, home warranties.
- Route H040 — Est. homes built 2010 or later 28.5%, 132 homes
- Route R001 — Est. homes built 2010 or later 26.7%, 334 homes
- Route C004 — Est. homes built 2010 or later 11.6%, 878 homes
Select these 3 routes on the route map
Most businesses
For B2B offers: office supplies, cleaning, IT, catering and commercial services.
- Route C004 — USPS business mailboxes 57, 878 homes
- Route R001 — USPS business mailboxes 9, 334 homes
Select these 2 routes on the route map
Every carrier route in 78140
| Route | Type | Homes | Businesses | Est. median income | Est. owners | Est. families with kids | Est. moved in past year |
|---|---|---|---|---|---|---|---|
| C004 | City | 878 | 57 | $35,266 | 69.0% | 39.3% | — |
| H002 | Highway contract | 40 | 0 | $53,742 | 66.8% | 53.9% | — |
| H040 | Highway contract | 132 | 0 | $76,165 | 79.2% | 41.8% | — |
| R001 | Rural | 334 | 9 | $74,825 | 80.7% | 33.7% | — |
Income, owners, families and movers are estimates for each route (how we estimate them); mailbox counts are current USPS figures. Open 78140 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
- 78143 (6.3 mi)
- 78160 — Stockdale city, TX (9.8 mi)
- 78677 (10.8 mi)
- 78122 (10.9 mi)
- 78159 — Smiley city, TX (12.1 mi)
- 78614 (12.8 mi)
- 78116 (14.2 mi)
- 78161 (17.3 mi)
Areas that include 78140
- Nixon, TX ZIP codes — 1 ZIP code
- Gonzales County ZIP codes — 11 ZIP codes
- Wilson County ZIP codes — 9 ZIP codes
- Texas ZIP code data
Where it ranks
- No. 5 of 5: highest median home value in Gonzales County
- No. 5 of 6: highest share of owner-occupied homes in Gonzales County
- No. 1 of 6: highest share of households with children in Gonzales County
- No. 2 of 6: highest share of residents who moved in during the past year in Gonzales County
- No. 2 of 6: lowest median age in Gonzales County
- No. 5 of 6: highest median age in Gonzales County
- No. 5 of 6: fastest population growth in Gonzales County
Mail every home in 78140
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) 78140, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.
Frequently asked questions
- What city is 78140 in?
- 78140 is a Nixon, TX mailing address. None of its land lies inside a Census-defined city or community.
- What county is 78140 in?
- 78140 is mostly in Gonzales County (68% of its land), with smaller parts in Wilson, Guadalupe and Karnes counties.
- What is the population of 78140?
- About 3,474 people (±627), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 3,607.
- What is the median household income in 78140?
- $50,250 (±$11,928), 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 78140?
- 4 USPS carrier routes with 1,384 residential and 66 business mailboxes (1,446 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.
- What ZIP codes are near 78140?
- The closest, measured center to center: 78143 (6.3 mi), 78160 (9.8 mi, Stockdale), 78677 (10.8 mi), 78122 (10.9 mi), 78159 (12.1 mi, Smiley) and 78614 (12.8 mi).
This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.