78957 ZIP Code, Smithville, TX
78957 is a ZIP code in Smithville, Texas — mostly in Bastrop County (89% of its land), with smaller parts in Fayette County. It covers 177 square miles of land, centered about 38 miles southeast of downtown Austin. The closest ZIP codes are 78963, 78602 and 78949. 10,543 people live here in 4,198 households. It is rural, with fewer than 100 people per square mile, and most homes are owner-occupied (73%). Median household income is $69,149, below the Texas median of $78,476.
Quick facts
- Mailing city: Smithville, TX
- County: Bastrop County
- Metro area: Austin
- Land area: 177 sq mi
- Population: 10,543
- Median household income: $69,149
- Carrier routes: 8 (4,382 homes)
Key figures
| Measure | Value |
|---|---|
| Residents | 10,543 |
| Households | 4,198 |
| Median household income | $69,149 |
| Income per person | $37,157 |
| Median age | 41.8 |
| Homeowners | 72.6% |
| Median home value | $259,900 |
| Median rent | $1,383 |
| Bachelor's degree or higher | 23.1% |
| Average commute (minutes) | 32.1 |
| Households with kids under 18 | 25.3% |
| Moved in the past year | 10.3% |
| Below the poverty line | 11.8% |
| Broadband internet | 87.9% |
| Speak a non-English language at home | 14.6% |
Household income
| % of households | Value |
|---|---|
| <$10K | 4.1% |
| $10–15K | 1.8% |
| $15–25K | 6.4% |
| $25–35K | 7.7% |
| $35–50K | 13.8% |
| $50–75K | 19.4% |
| $75–100K | 13.2% |
| $100–150K | 14.8% |
| $150–200K | 13.1% |
| $200K+ | 5.6% |
Age
| % of all residents | Value |
|---|---|
| <10 | 15.4% |
| 10–19 | 8.6% |
| 20–24 | 5.8% |
| 25–34 | 13.1% |
| 35–44 | 9.4% |
| 45–54 | 13.1% |
| 55–64 | 14.5% |
| 65–74 | 11.2% |
| 75+ | 8.8% |
Tenure
| % of housing units | Value |
|---|---|
| Owned, with mortgage | 35.2% |
| Owned outright | 28.1% |
| Rented | 23.9% |
| Vacant | 12.7% |
Type of building
| % of housing units | Value |
|---|---|
| Detached house | 73.2% |
| Townhome | 2.2% |
| 2–4 units | 3.0% |
| 5–19 units | 0.2% |
| 20+ units | 3.4% |
| Mobile / other | 18.0% |
Businesses in 78957
180 business establishments with 1,126 employees (ZIP Codes Business Patterns 2023).
- Construction: 33
- Retail Trade: 26
- Other Services (except Public Administration): 19
- Accommodation and Food Services: 18
- Health Care and Social Assistance: 17
- Manufacturing: 15
- Professional, Scientific, and Technical Services: 13
- Finance and Insurance: 8
EDDM carrier routes
78957 has 8 USPS carrier routes with 4,382 residential and 193 business mailboxes. Open the EDDM route map.
Carrier routes in 78957
78957 has 8 USPS carrier routes (2 city (C), 6 rural (R)) with 4,382 residential and 193 business mailboxes. Routes range from 398 homes (R006) to 762 homes (C001); the median route has 528 homes. The Census counted 4,198 households in 78957 (2020–2024 average); USPS counts current mailboxes, including new and vacant homes.
| Homes per route | Routes |
|---|---|
| 1–249 | 0 |
| 250–499 | 3 |
| 500–749 | 4 |
| 750–999 | 1 |
| 1,000–1,499 | 0 |
| 1,500+ | 0 |
Best routes in 78957 for…
Highest income
For bigger-ticket offers: remodeling, pools, financial planning, private schools.
- Route R005 — Est. median household income $86,690, 471 homes
- Route C002 — Est. median household income $81,340, 605 homes
- Route R002 — Est. median household income $78,745, 512 homes
- Route R003 — Est. median household income $76,946, 649 homes
- Route R004 — Est. median household income $75,452, 544 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 R005 — Est. families with children under 18 35.8%, 471 homes
- Route R004 — Est. families with children under 18 28.2%, 544 homes
- Route R002 — Est. families with children under 18 27.3%, 512 homes
- Route R006 — Est. families with children under 18 26.7%, 398 homes
- Route R001 — Est. families with children under 18 23.1%, 441 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 92.6%, 512 homes
- Route R004 — Est. owner-occupied homes 88.0%, 544 homes
- Route R001 — Est. owner-occupied homes 86.0%, 441 homes
- Route R005 — Est. owner-occupied homes 79.0%, 471 homes
- Route R006 — Est. owner-occupied homes 75.0%, 398 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 C001 — Est. residents who moved in the past year 15.3%, 762 homes
- Route R005 — Est. residents who moved in the past year 15.0%, 471 homes
- Route C002 — Est. residents who moved in the past year 10.2%, 605 homes
- Route R004 — Est. residents who moved in the past year 8.9%, 544 homes
- Route R006 — Est. residents who moved in the past year 8.9%, 398 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 R004 — Est. homes built 2010 or later 31.9%, 544 homes
- Route R006 — Est. homes built 2010 or later 20.5%, 398 homes
- Route R002 — Est. homes built 2010 or later 19.8%, 512 homes
- Route R001 — Est. homes built 2010 or later 18.0%, 441 homes
- Route R003 — Est. homes built 2010 or later 17.7%, 649 homes
Select these 5 routes on the route map
Most businesses
For B2B offers: office supplies, cleaning, IT, catering and commercial services.
- Route C001 — USPS business mailboxes 82, 762 homes
- Route C002 — USPS business mailboxes 40, 605 homes
- Route R004 — USPS business mailboxes 29, 544 homes
- Route R003 — USPS business mailboxes 25, 649 homes
- Route R002 — USPS business mailboxes 8, 512 homes
Select these 5 routes on the route map
Every carrier route in 78957
| Route | Type | Homes | Businesses | Est. median income | Est. owners | Est. families with kids | Est. moved in past year |
|---|---|---|---|---|---|---|---|
| C001 | City | 762 | 82 | $53,023 | 52.6% | 20.0% | 15.3% |
| C002 | City | 605 | 40 | $81,340 | 58.1% | 21.0% | 10.2% |
| R001 | Rural | 441 | 1 | $67,198 | 86.0% | 23.1% | 4.1% |
| R002 | Rural | 512 | 8 | $78,745 | 92.6% | 27.3% | 7.1% |
| R003 | Rural | 649 | 25 | $76,946 | 73.1% | 15.8% | 6.6% |
| R004 | Rural | 544 | 29 | $75,452 | 88.0% | 28.2% | 8.9% |
| R005 | Rural | 471 | 7 | $86,690 | 79.0% | 35.8% | 15.0% |
| R006 | Rural | 398 | 1 | $71,290 | 75.0% | 26.7% | 8.9% |
Income, owners, families and movers are estimates for each route (how we estimate them); mailbox counts are current USPS figures. Open 78957 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
- 78963 — Plum CDP, TX (11.4 mi)
- 78602 — Camp Swift CDP, TX (12 mi)
- 78949 (13 mi)
- 78659 — Circle D-KC Estates CDP, TX (13.8 mi)
- 78953 — Rosanky CDP, TX (15.8 mi)
- 78662 — Red Rock CDP, TX (16.4 mi)
- 78942 — Giddings city, TX (17.6 mi)
- 78945 — La Grange city, TX (18.8 mi)
Areas that include 78957
- Smithville, TX ZIP codes — 1 ZIP code
- Rosanky, TX ZIP codes — 2 ZIP codes
- Bastrop County ZIP codes — 10 ZIP codes
- Fayette County ZIP codes — 13 ZIP codes
- Austin ZIP code map — 89 ZIP codes
- Texas ZIP code data
Where it ranks
- No. 24 of 83: highest median age in the Austin area
- No. 4 of 10: highest share of residents who moved in during the past year in Bastrop County
- No. 5 of 10: highest median age in Bastrop County
Mail every home in 78957
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) 78957, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.
Frequently asked questions
- What city is 78957 in?
- 78957 is a Smithville, TX mailing address. By land area, 7% lies inside Rosanky and 2% lies inside Smithville; the rest is outside any Census-defined city or community.
- What county is 78957 in?
- 78957 is mostly in Bastrop County (89% of its land), with smaller parts in Fayette County.
- What is the population of 78957?
- About 10,543 people (±826), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 10,214.
- What is the median household income in 78957?
- $69,149 (±$9,580), 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 78957?
- 8 USPS carrier routes with 4,382 residential and 193 business mailboxes (4,578 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.
- What ZIP codes are near 78957?
- The closest, measured center to center: 78963 (11.4 mi, Plum), 78602 (12 mi, Camp Swift), 78949 (13 mi), 78659 (13.8 mi, Circle D-KC Estates), 78953 (15.8 mi, Rosanky) and 78662 (16.4 mi, Red Rock).
This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.