78721 ZIP Code, Austin, TX
78721 is a ZIP code in Austin, Texas in Travis County. It covers 3.6 square miles of land, centered about 3.6 miles east of downtown Austin. The closest ZIP codes are 78702, 78722 and 78723. 10,997 people live here in 4,973 households. At about 3,082 people per square mile it has suburban density, and owners and renters are mixed (51% own). Median household income is $84,573, close to the Texas median of $78,476; 20% of residents moved in during the past year.
Quick facts
- Mailing city: Austin, TX
- County: Travis County
- Metro area: Austin
- Land area: 3.6 sq mi
- Population: 10,997
- Median household income: $84,573
- Carrier routes: 8 (6,325 homes)
Key figures
| Measure | Value |
|---|---|
| Residents | 10,997 |
| Households | 4,973 |
| Median household income | $84,573 |
| Income per person | $57,366 |
| Median age | 33.8 |
| Homeowners | 51.3% |
| Median home value | $523,000 |
| Median rent | $1,482 |
| Bachelor's degree or higher | 51.6% |
| Average commute (minutes) | 22.8 |
| Households with kids under 18 | 21.8% |
| Moved in the past year | 20.4% |
| Below the poverty line | 25.8% |
| Broadband internet | 86.3% |
| Speak a non-English language at home | 34.6% |
Household income
| % of households | Value |
|---|---|
| <$10K | 11.1% |
| $10–15K | 2.6% |
| $15–25K | 6.7% |
| $25–35K | 5.6% |
| $35–50K | 9.5% |
| $50–75K | 10.7% |
| $75–100K | 7.1% |
| $100–150K | 13.8% |
| $150–200K | 13.3% |
| $200K+ | 19.6% |
Age
| % of all residents | Value |
|---|---|
| <10 | 14.1% |
| 10–19 | 7.9% |
| 20–24 | 3.0% |
| 25–34 | 30.1% |
| 35–44 | 17.1% |
| 45–54 | 9.8% |
| 55–64 | 9.5% |
| 65–74 | 4.0% |
| 75+ | 4.7% |
Tenure
| % of housing units | Value |
|---|---|
| Owned, with mortgage | 33.7% |
| Owned outright | 14.4% |
| Rented | 45.1% |
| Vacant | 6.9% |
Type of building
| % of housing units | Value |
|---|---|
| Detached house | 59.9% |
| Townhome | 4.7% |
| 2–4 units | 10.2% |
| 5–19 units | 2.1% |
| 20+ units | 22.7% |
| Mobile / other | 0.3% |
Businesses in 78721
310 business establishments with 5,704 employees (ZIP Codes Business Patterns 2023).
- Professional, Scientific, and Technical Services: 46
- Other Services (except Public Administration): 36
- Health Care and Social Assistance: 35
- Retail Trade: 30
- Construction: 24
- Accommodation and Food Services: 22
- Wholesale Trade: 21
- Administrative and Support and Waste Management and Remediation Services: 18
EDDM carrier routes
78721 has 8 USPS carrier routes with 6,325 residential and 370 business mailboxes. Open the EDDM route map.
Carrier routes in 78721
78721 has 8 USPS carrier routes (8 city (C)) with 6,325 residential and 370 business mailboxes. Routes range from 542 homes (C040) to 1,388 homes (C035); the median route has 660 homes. The Census counted 4,973 households in 78721 (2020–2024 average); USPS counts current mailboxes, including new and vacant homes.
| Homes per route | Routes |
|---|---|
| 1–249 | 0 |
| 250–499 | 0 |
| 500–749 | 6 |
| 750–999 | 0 |
| 1,000–1,499 | 2 |
| 1,500+ | 0 |
Best routes in 78721 for…
Highest income
For bigger-ticket offers: remodeling, pools, financial planning, private schools.
- Route C038 — Est. median household income $134,664, 658 homes
- Route C039 — Est. median household income $121,941, 661 homes
- Route C034 — Est. median household income $120,715, 702 homes
- Route C033 — Est. median household income $120,250, 654 homes
- Route C032 — Est. median household income $83,796, 643 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 C040 — Est. families with children under 18 45.1%, 542 homes
- Route C035 — Est. families with children under 18 41.2%, 1,388 homes
- Route C033 — Est. families with children under 18 24.0%, 654 homes
- Route C038 — Est. families with children under 18 23.9%, 658 homes
- Route C031 — Est. families with children under 18 21.0%, 1,077 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 C038 — Est. owner-occupied homes 87.3%, 658 homes
- Route C033 — Est. owner-occupied homes 68.5%, 654 homes
- Route C039 — Est. owner-occupied homes 67.1%, 661 homes
- Route C031 — Est. owner-occupied homes 58.8%, 1,077 homes
- Route C032 — Est. owner-occupied homes 55.8%, 643 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 C031 — Est. residents who moved in the past year 38.4%, 1,077 homes
- Route C034 — Est. residents who moved in the past year 31.9%, 702 homes
- Route C032 — Est. residents who moved in the past year 23.2%, 643 homes
- Route C039 — Est. residents who moved in the past year 20.4%, 661 homes
- Route C033 — Est. residents who moved in the past year 15.9%, 654 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 C034 — Est. homes built 2010 or later 60.9%, 702 homes
- Route C031 — Est. homes built 2010 or later 39.6%, 1,077 homes
- Route C039 — Est. homes built 2010 or later 35.3%, 661 homes
- Route C035 — Est. homes built 2010 or later 31.5%, 1,388 homes
- Route C033 — Est. homes built 2010 or later 27.6%, 654 homes
Select these 5 routes on the route map
Most businesses
For B2B offers: office supplies, cleaning, IT, catering and commercial services.
- Route C034 — USPS business mailboxes 96, 702 homes
- Route C031 — USPS business mailboxes 86, 1,077 homes
- Route C040 — USPS business mailboxes 71, 542 homes
- Route C035 — USPS business mailboxes 44, 1,388 homes
- Route C039 — USPS business mailboxes 37, 661 homes
Select these 5 routes on the route map
Every carrier route in 78721
| Route | Type | Homes | Businesses | Est. median income | Est. owners | Est. families with kids | Est. moved in past year |
|---|---|---|---|---|---|---|---|
| C031 | City | 1,077 | 86 | $66,102 | 58.8% | 21.0% | 38.4% |
| C032 | City | 643 | 24 | $83,796 | 55.8% | 15.7% | 23.2% |
| C033 | City | 654 | 3 | $120,250 | 68.5% | 24.0% | 15.9% |
| C034 | City | 702 | 96 | $120,715 | 34.9% | 12.3% | 31.9% |
| C035 | City | 1,388 | 44 | $55,108 | 36.1% | 41.2% | 14.4% |
| C038 | City | 658 | 9 | $134,664 | 87.3% | 23.9% | 14.9% |
| C039 | City | 661 | 37 | $121,941 | 67.1% | 17.4% | 20.4% |
| C040 | City | 542 | 71 | $51,860 | 29.3% | 45.1% | 12.8% |
Income, owners, families and movers are estimates for each route (how we estimate them); mailbox counts are current USPS figures. Open 78721 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
- 78702 — Austin city, TX (1.9 mi)
- 78722 — Austin city, TX (2.3 mi)
- 78723 — Austin city, TX (2.3 mi)
- 78742 — Austin city, TX (2.5 mi)
- 78712 — Austin city, TX (3.1 mi)
- 78741 — Austin city, TX (3.4 mi)
- 78701 — Austin city, TX (3.5 mi)
- 78751 — Austin city, TX (3.6 mi)
Areas that include 78721
- 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. 17 of 83: highest share of residents who moved in during the past year in the Austin area
- No. 17 of 83: lowest median age in the Austin area
- No. 13 of 54: highest share of residents who moved in during the past year in Travis County
- No. 11 of 54: lowest median age in Travis County
- No. 14 of 44: highest share of residents who moved in during the past year in Austin, TX
- No. 9 of 44: lowest median age in Austin, TX
Mail every home in 78721
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) 78721, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.
Frequently asked questions
- What city is 78721 in?
- 78721 is a Austin, TX mailing address. By land area, 100% lies inside Austin.
- What county is 78721 in?
- 78721 is in Travis County.
- What is the population of 78721?
- About 10,997 people (±1,053), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 11,316.
- What is the median household income in 78721?
- $84,573 (±$23,003), 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 78721?
- 8 USPS carrier routes with 6,325 residential and 370 business mailboxes (6,694 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.
- What ZIP codes are near 78721?
- The closest, measured center to center: 78702 (1.9 mi, Austin), 78722 (2.3 mi, Austin), 78723 (2.3 mi, Austin), 78742 (2.5 mi, Austin), 78712 (3.1 mi, Austin) and 78741 (3.4 mi, Austin).
This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.