78731 ZIP Code, Austin, TX
78731 is a ZIP code in Austin, Texas in Travis County. It covers 8.7 square miles of land, centered about 5.8 miles north of downtown Austin. The closest ZIP codes are 78757, 78756 and 78751. 27,507 people live here in 14,343 households. At about 3,145 people per square mile it has suburban density, and owners and renters are mixed (53% own). Median household income is $105,494, above the Texas median of $78,476.
Quick facts
- Mailing city: Austin, TX
- County: Travis County
- Metro area: Austin
- Land area: 8.7 sq mi
- Population: 27,507
- Median household income: $105,494
- Carrier routes: 27 (14,270 homes)
Key figures
| Measure | Value |
|---|---|
| Residents | 27,507 |
| Households | 14,343 |
| Median household income | $105,494 |
| Income per person | $94,483 |
| Median age | 42.3 |
| Homeowners | 53.1% |
| Median home value | $903,200 |
| Median rent | $1,737 |
| Bachelor's degree or higher | 78.3% |
| Average commute (minutes) | 20.9 |
| Households with kids under 18 | 20.1% |
| Moved in the past year | 16.5% |
| Below the poverty line | 6.0% |
| Broadband internet | 95.2% |
| Speak a non-English language at home | 16.7% |
Household income
| % of households | Value |
|---|---|
| <$10K | 3.9% |
| $10–15K | 2.0% |
| $15–25K | 3.8% |
| $25–35K | 4.1% |
| $35–50K | 9.9% |
| $50–75K | 14.1% |
| $75–100K | 10.2% |
| $100–150K | 13.2% |
| $150–200K | 10.1% |
| $200K+ | 28.8% |
Age
| % of all residents | Value |
|---|---|
| <10 | 7.6% |
| 10–19 | 9.2% |
| 20–24 | 7.2% |
| 25–34 | 16.3% |
| 35–44 | 14.2% |
| 45–54 | 13.5% |
| 55–64 | 12.9% |
| 65–74 | 9.5% |
| 75+ | 9.8% |
Tenure
| % of housing units | Value |
|---|---|
| Owned, with mortgage | 27.3% |
| Owned outright | 23.1% |
| Rented | 44.2% |
| Vacant | 5.4% |
Type of building
| % of housing units | Value |
|---|---|
| Detached house | 46.7% |
| Townhome | 8.8% |
| 2–4 units | 5.4% |
| 5–19 units | 21.1% |
| 20+ units | 17.6% |
| Mobile / other | 0.4% |
Businesses in 78731
2,255 business establishments with 24,680 employees (ZIP Codes Business Patterns 2023).
- Professional, Scientific, and Technical Services: 684
- Health Care and Social Assistance: 370
- Real Estate and Rental and Leasing: 191
- Finance and Insurance: 161
- Administrative and Support and Waste Management and Remediation Services: 133
- Other Services (except Public Administration): 127
- Retail Trade: 105
- Construction: 102
EDDM carrier routes
78731 has 27 USPS carrier routes with 14,270 residential and 1,234 business mailboxes. Open the EDDM route map.
Carrier routes in 78731
78731 has 27 USPS carrier routes (27 city (C)) with 14,270 residential and 1,234 business mailboxes. Routes range from 262 homes (C005) to 1,847 homes (C007); the median route has 437 homes. The Census counted 14,343 households in 78731 (2020–2024 average); USPS counts current mailboxes, including new and vacant homes.
| Homes per route | Routes |
|---|---|
| 1–249 | 0 |
| 250–499 | 19 |
| 500–749 | 5 |
| 750–999 | 1 |
| 1,000–1,499 | 1 |
| 1,500+ | 1 |
Best routes in 78731 for…
Highest income
For bigger-ticket offers: remodeling, pools, financial planning, private schools.
- Route C028 — Est. median household income $200,000+, 527 homes
- Route C081 — Est. median household income $200,000+, 465 homes
- Route C017 — Est. median household income $200,000+, 396 homes
- Route C085 — Est. median household income $200,000+, 296 homes
- Route C005 — Est. median household income $200,000+, 262 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 C017 — Est. families with children under 18 47.8%, 396 homes
- Route C004 — Est. families with children under 18 38.7%, 462 homes
- Route C085 — Est. families with children under 18 36.0%, 296 homes
- Route C028 — Est. families with children under 18 35.6%, 527 homes
- Route C032 — Est. families with children under 18 34.6%, 534 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 C005 — Est. owner-occupied homes 95.8%, 262 homes
- Route C026 — Est. owner-occupied homes 95.4%, 351 homes
- Route C008 — Est. owner-occupied homes 93.0%, 416 homes
- Route C081 — Est. owner-occupied homes 92.7%, 465 homes
- Route C013 — Est. owner-occupied homes 92.5%, 433 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 C007 — Est. residents who moved in the past year 35.6%, 1,847 homes
- Route C001 — Est. residents who moved in the past year 35.6%, 334 homes
- Route C031 — Est. residents who moved in the past year 29.0%, 357 homes
- Route C054 — Est. residents who moved in the past year 29.0%, 346 homes
- Route C010 — Est. residents who moved in the past year 25.0%, 839 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 C001 — Est. homes built 2010 or later 41.6%, 334 homes
- Route C007 — Est. homes built 2010 or later 39.9%, 1,847 homes
- Route C017 — Est. homes built 2010 or later 22.7%, 396 homes
- Route C005 — Est. homes built 2010 or later 17.2%, 262 homes
- Route C032 — Est. homes built 2010 or later 15.3%, 534 homes
Select these 5 routes on the route map
Most businesses
For B2B offers: office supplies, cleaning, IT, catering and commercial services.
- Route C010 — USPS business mailboxes 339, 839 homes
- Route C031 — USPS business mailboxes 217, 357 homes
- Route C001 — USPS business mailboxes 157, 334 homes
- Route C018 — USPS business mailboxes 117, 710 homes
- Route C084 — USPS business mailboxes 82, 579 homes
Select these 5 routes on the route map
Every carrier route in 78731
| Route | Type | Homes | Businesses | Est. median income | Est. owners | Est. families with kids | Est. moved in past year |
|---|---|---|---|---|---|---|---|
| C001 | City | 334 | 157 | $95,114 | 40.4% | 6.9% | 35.6% |
| C002 | City | 437 | 7 | $147,603 | 86.3% | 22.6% | 12.7% |
| C004 | City | 462 | 10 | $134,536 | 58.3% | 38.7% | 24.5% |
| C005 | City | 262 | 1 | $200,000+ | 95.8% | 16.1% | 1.5% |
| C007 | City | 1,847 | 47 | $94,886 | 37.0% | 6.7% | 35.6% |
| C008 | City | 416 | 17 | $174,799 | 93.0% | 24.4% | 7.3% |
| C010 | City | 839 | 339 | $61,886 | 3.6% | 9.8% | 25.0% |
| C013 | City | 433 | 0 | $179,237 | 92.5% | 24.4% | 7.3% |
| C014 | City | 438 | 12 | $173,735 | 87.6% | 16.5% | 11.5% |
| C015 | City | 408 | 17 | $181,665 | 91.8% | 23.6% | 3.6% |
| C016 | City | 499 | 2 | $101,769 | 36.3% | 25.9% | 22.1% |
| C017 | City | 396 | 8 | $200,000+ | 84.0% | 47.8% | 18.2% |
| C018 | City | 710 | 117 | $67,480 | 14.6% | 3.7% | 20.9% |
| C020 | City | 384 | 0 | $148,500 | 68.2% | 29.4% | 9.5% |
| C021 | City | 481 | 31 | $177,716 | 85.7% | 31.0% | 8.9% |
| C025 | City | 1,281 | 5 | $49,463 | 13.9% | 13.1% | 18.4% |
| C026 | City | 351 | 0 | $199,064 | 95.4% | 31.2% | 2.4% |
| C028 | City | 527 | 1 | $200,000+ | 82.8% | 35.6% | 8.0% |
| C030 | City | 521 | 1 | $164,340 | 90.0% | 19.3% | 8.9% |
| C031 | City | 357 | 217 | $168,107 | 66.3% | 27.5% | 29.0% |
| C032 | City | 534 | 82 | $140,347 | 68.2% | 34.6% | 8.7% |
| C035 | City | 284 | 0 | $184,252 | 91.2% | 14.9% | 6.6% |
| C036 | City | 383 | 0 | $144,913 | 67.6% | 24.0% | 15.5% |
| C054 | City | 346 | 0 | $157,632 | 71.3% | 27.9% | 29.0% |
| C081 | City | 465 | 1 | $200,000+ | 92.7% | 28.8% | 8.5% |
| C084 | City | 579 | 82 | $149,526 | 70.0% | 32.0% | 11.8% |
| C085 | City | 296 | 80 | $200,000+ | 85.7% | 36.0% | 15.3% |
Income, owners, families and movers are estimates for each route (how we estimate them); mailbox counts are current USPS figures. Open 78731 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
- 78757 — Austin city, TX (2.1 mi)
- 78756 — Austin city, TX (2.5 mi)
- 78751 — Austin city, TX (3.7 mi)
- 78703 — Austin city, TX (3.8 mi)
- 78759 — Austin city, TX (3.8 mi)
- 78752 — Austin city, TX (4 mi)
- 78705 — Austin city, TX (4.1 mi)
- 78746 — Austin city, TX (4.3 mi)
Areas that include 78731
- Austin, TX ZIP codes — 46 ZIP codes
- Travis County ZIP codes — 56 ZIP codes
- Austin ZIP code map — 89 ZIP codes
- Texas ZIP code data
Where it ranks
- No. 7 of 83: highest median home value in the Austin area
- No. 21 of 83: highest median age in the Austin area
- No. 7 of 54: highest median home value in Travis County
- No. 11 of 54: highest median age in Travis County
- No. 7 of 44: highest median home value in Austin, TX
- No. 8 of 44: highest median age in Austin, TX
Mail every home in 78731
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.
Austin EDDM mailing
EDDM guides
ZIP code statistics describe the Census ZIP Code Tabulation Area (ZCTA) 78731, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.
Frequently asked questions
- What city is 78731 in?
- 78731 is a Austin, TX mailing address. By land area, 100% lies inside Austin.
- What county is 78731 in?
- 78731 is in Travis County.
- What is the population of 78731?
- About 27,507 people (±1,384), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 27,240.
- What is the median household income in 78731?
- $105,494 (±$7,747), 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 78731?
- 27 USPS carrier routes with 14,270 residential and 1,234 business mailboxes (15,506 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.
- What ZIP codes are near 78731?
- The closest, measured center to center: 78757 (2.1 mi, Austin), 78756 (2.5 mi, Austin), 78751 (3.7 mi, Austin), 78703 (3.8 mi, Austin), 78759 (3.8 mi, Austin) and 78752 (4 mi, Austin).
This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.