78738 ZIP Code, Austin, TX

78738 is a ZIP code in Austin, Texas in Travis County. It covers 42 square miles of land, centered about 15 miles west of downtown Austin. The closest ZIP codes are 78736, 78734 and 78733. 31,019 people live here in 12,063 households. With about 737 people per square mile it is lightly settled, and most homes are owner-occupied (75%). Median household income is $183,048, well above the Texas median of $78,476.

Quick facts

Key figures

MeasureValue
Residents31,019
Households12,063
Median household income$183,048
Income per person$99,621
Median age43.4
Homeowners75.3%
Median home value$916,300
Median rent$1,983
Bachelor's degree or higher75.0%
Average commute (minutes)25.9
Households with kids under 1838.4%
Moved in the past year15.2%
Below the poverty line3.8%
Broadband internet99.6%
Speak a non-English language at home19.2%

Household income

% of householdsValue
<$10K3.7%
$10–15K0.5%
$15–25K2.6%
$25–35K1.7%
$35–50K6.3%
$50–75K10.2%
$75–100K6.3%
$100–150K12.1%
$150–200K11.3%
$200K+45.3%

Age

% of all residentsValue
<1013.9%
10–1915.4%
20–241.7%
25–347.7%
35–4415.1%
45–5418.3%
55–6411.7%
65–7410.1%
75+6.1%

Tenure

% of housing unitsValue
Owned, with mortgage55.2%
Owned outright17.5%
Rented23.6%
Vacant3.7%

Type of building

% of housing unitsValue
Detached house77.1%
Townhome0.8%
2–4 units2.6%
5–19 units9.1%
20+ units10.1%
Mobile / other0.3%

Businesses in 78738

1,288 business establishments with 13,677 employees (ZIP Codes Business Patterns 2023).

EDDM carrier routes

78738 has 23 USPS carrier routes with 14,520 residential and 930 business mailboxes. Open the EDDM route map.

Carrier routes in 78738

78738 has 23 USPS carrier routes (23 rural (R)) with 14,520 residential and 930 business mailboxes. Routes range from 203 homes (R087) to 1,224 homes (R193); the median route has 605 homes. The Census counted 12,063 households in 78738 (2020–2024 average); USPS counts current mailboxes, including new and vacant homes.

Homes per routeRoutes
1–2491
250–4994
500–74914
750–9993
1,000–1,4991
1,500+0

Best routes in 78738 for…

Highest income

For bigger-ticket offers: remodeling, pools, financial planning, private schools.

  1. Route R193 — Est. median household income $200,000+, 1,224 homes
  2. Route R244 — Est. median household income $200,000+, 976 homes
  3. Route R209 — Est. median household income $200,000+, 866 homes
  4. Route R257 — Est. median household income $200,000+, 832 homes
  5. Route R270 — Est. median household income $200,000+, 747 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.

  1. Route R257 — Est. families with children under 18 61.8%, 832 homes
  2. Route R193 — Est. families with children under 18 57.8%, 1,224 homes
  3. Route R114 — Est. families with children under 18 55.5%, 417 homes
  4. Route R270 — Est. families with children under 18 49.9%, 747 homes
  5. Route R219 — Est. families with children under 18 49.9%, 746 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.

  1. Route R189 — Est. owner-occupied homes 97.5%, 605 homes
  2. Route R011 — Est. owner-occupied homes 96.1%, 574 homes
  3. Route R270 — Est. owner-occupied homes 95.8%, 747 homes
  4. Route R219 — Est. owner-occupied homes 95.8%, 746 homes
  5. Route R271 — Est. owner-occupied homes 95.3%, 274 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.

  1. Route R231 — Est. residents who moved in the past year 28.0%, 585 homes
  2. Route R163 — Est. residents who moved in the past year 24.6%, 588 homes
  3. Route R123 — Est. residents who moved in the past year 24.3%, 605 homes
  4. Route R193 — Est. residents who moved in the past year 22.9%, 1,224 homes
  5. Route R106 — Est. residents who moved in the past year 22.8%, 605 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.

  1. Route R219 — Est. homes built 2010 or later 86.8%, 746 homes
  2. Route R270 — Est. homes built 2010 or later 86.7%, 747 homes
  3. Route R244 — Est. homes built 2010 or later 85.8%, 976 homes
  4. Route R209 — Est. homes built 2010 or later 85.4%, 866 homes
  5. Route R163 — Est. homes built 2010 or later 76.8%, 588 homes

Select these 5 routes on the route map

Most businesses

For B2B offers: office supplies, cleaning, IT, catering and commercial services.

  1. Route R153 — USPS business mailboxes 258, 670 homes
  2. Route R087 — USPS business mailboxes 247, 203 homes
  3. Route R114 — USPS business mailboxes 147, 417 homes
  4. Route R106 — USPS business mailboxes 64, 605 homes
  5. Route R231 — USPS business mailboxes 48, 585 homes

Select these 5 routes on the route map

Every carrier route in 78738

RouteTypeHomesBusinessesEst. median incomeEst. ownersEst. families with kidsEst. moved in past year
R011Rural5740$181,18796.1%20.0%6.8%
R040Rural6511$125,13062.3%33.7%10.5%
R085Rural5332$162,51990.7%19.4%6.5%
R087Rural203247$118,54940.8%24.1%17.6%
R088Rural46248$189,26879.7%43.0%11.4%
R106Rural60564$200,000+85.1%45.3%22.8%
R114Rural417147$200,000+89.7%55.5%9.2%
R123Rural60523$113,12046.8%29.3%24.3%
R141Rural6104$113,87148.4%19.6%14.9%
R153Rural670258$118,18049.2%26.4%16.5%
R163Rural58841$113,08970.7%30.6%24.6%
R183Rural74713$174,62357.1%35.1%11.2%
R189Rural6051$200,000+97.5%49.9%11.2%
R193Rural1,2248$200,000+85.2%57.8%22.9%
R209Rural8663$200,000+93.1%48.4%9.6%
R219Rural7464$200,000+95.8%49.9%9.2%
R228Rural7053$188,42069.0%44.9%20.0%
R231Rural58548$170,38074.4%41.2%28.0%
R238Rural2950$200,000+93.5%45.2%7.5%
R244Rural9762$200,000+93.7%49.1%9.7%
R257Rural8324$200,000+90.8%61.8%19.6%
R270Rural7479$200,000+95.8%49.9%9.2%
R271Rural2740$190,05795.3%34.3%11.6%

Income, owners, families and movers are estimates for each route (how we estimate them); mailbox counts are current USPS figures. Open 78738 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

Areas that include 78738

Where it ranks

Mail every home in 78738

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) 78738, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.

Frequently asked questions

What city is 78738 in?
78738 is a Austin, TX mailing address. By land area, 20% lies inside Bee Cave, 12% lies inside Lakeway and 3% lies inside The Hills; the rest is outside any Census-defined city or community.
What county is 78738 in?
78738 is in Travis County.
What is the population of 78738?
About 31,019 people (±1,575), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 29,529.
What is the median household income in 78738?
$183,048 (±$16,078), 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 78738?
23 USPS carrier routes with 14,520 residential and 930 business mailboxes (15,450 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.
What ZIP codes are near 78738?
The closest, measured center to center: 78736 (4.7 mi, Austin), 78734 (5.6 mi, Lakeway), 78733 (6.3 mi, Austin), 78735 (7.6 mi, Austin), 78732 (7.7 mi, Steiner Ranch) and 78737 (9.2 mi, Belterra).

This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.