78655 ZIP Code, Martindale, TX
78655 is a ZIP code in Martindale, Texas — mostly in Caldwell County (60% of its land), with smaller parts in Guadalupe County. It covers 29 square miles of land, centered about 32 miles south of downtown Austin. The closest ZIP codes are 78670, 78622 and 78656. 3,730 people live here in 1,388 households. With about 130 people per square mile it is lightly settled, and owners and renters are mixed (65% own). Median household income is $55,952, below the Texas median of $78,476.
Quick facts
- Mailing city: Martindale, TX
- County: Caldwell County
- Metro area: Austin
- Land area: 29 sq mi
- Population: 3,730
- Median household income: $55,952
- Carrier routes: 2 (919 homes)
Key figures
| Measure | Value |
|---|---|
| Residents | 3,730 |
| Households | 1,388 |
| Median household income | $55,952 |
| Income per person | $29,805 |
| Median age | 44.6 |
| Homeowners | 65.3% |
| Median home value | $269,900 |
| Median rent | $1,093 |
| Bachelor's degree or higher | 20.1% |
| Average commute (minutes) | 33.4 |
| Households with kids under 18 | 39.0% |
| Moved in the past year | 8.2% |
| Below the poverty line | 16.5% |
| Broadband internet | 98.8% |
| Speak a non-English language at home | 33.4% |
Household income
| % of households | Value |
|---|---|
| <$10K | 2.9% |
| $10–15K | 2.2% |
| $15–25K | 0.9% |
| $25–35K | 22.3% |
| $35–50K | 20.2% |
| $50–75K | 13.0% |
| $75–100K | 14.7% |
| $100–150K | 10.4% |
| $150–200K | 5.2% |
| $200K+ | 8.3% |
Age
| % of all residents | Value |
|---|---|
| <10 | 14.5% |
| 10–19 | 11.1% |
| 20–24 | 4.6% |
| 25–34 | 16.4% |
| 35–44 | 4.9% |
| 45–54 | 26.4% |
| 55–64 | 11.7% |
| 65–74 | 5.3% |
| 75+ | 5.1% |
Tenure
| % of housing units | Value |
|---|---|
| Owned, with mortgage | 27.2% |
| Owned outright | 36.3% |
| Rented | 33.4% |
| Vacant | 3.1% |
Type of building
| % of housing units | Value |
|---|---|
| Detached house | 62.4% |
| Townhome | 0.8% |
| 2–4 units | 2.2% |
| 5–19 units | 2.1% |
| 20+ units | 0.0% |
| Mobile / other | 32.6% |
Businesses in 78655
44 business establishments with 190 employees (ZIP Codes Business Patterns 2023).
- Construction: 9
- Retail Trade: 5
- Professional, Scientific, and Technical Services: 5
- Health Care and Social Assistance: 4
- Other Services (except Public Administration): 4
- Accommodation and Food Services: 3
EDDM carrier routes
78655 has 2 USPS carrier routes with 919 residential and 20 business mailboxes. Open the EDDM route map.
Carrier routes in 78655
78655 has 2 USPS carrier routes (2 rural (R)) with 919 residential and 20 business mailboxes. Routes range from 171 homes (R404) to 748 homes (R401); the median route has 460 homes. The Census counted 1,388 households in 78655 (2020–2024 average); USPS counts current mailboxes, including new and vacant homes.
| Homes per route | Routes |
|---|---|
| 1–249 | 1 |
| 250–499 | 0 |
| 500–749 | 1 |
| 750–999 | 0 |
| 1,000–1,499 | 0 |
| 1,500+ | 0 |
Best routes in 78655 for…
Highest income
For bigger-ticket offers: remodeling, pools, financial planning, private schools.
- Route R404 — Est. median household income $62,568, 171 homes
- Route R401 — Est. median household income $62,500, 748 homes
Select these 2 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 R401 — Est. families with children under 18 36.3%, 748 homes
- Route R404 — Est. families with children under 18 24.8%, 171 homes
Select these 2 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 R401 — Est. owner-occupied homes 64.7%, 748 homes
- Route R404 — Est. owner-occupied homes 50.7%, 171 homes
Select these 2 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 R404 — Est. residents who moved in the past year 13.8%, 171 homes
- Route R401 — Est. residents who moved in the past year 11.6%, 748 homes
Select these 2 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 R401 — Est. homes built 2010 or later 19.5%, 748 homes
- Route R404 — Est. homes built 2010 or later 17.3%, 171 homes
Select these 2 routes on the route map
Most businesses
For B2B offers: office supplies, cleaning, IT, catering and commercial services.
- Route R401 — USPS business mailboxes 19, 748 homes
- Route R404 — USPS business mailboxes 1, 171 homes
Select these 2 routes on the route map
Every carrier route in 78655
| Route | Type | Homes | Businesses | Est. median income | Est. owners | Est. families with kids | Est. moved in past year |
|---|---|---|---|---|---|---|---|
| R401 | Rural | 748 | 19 | $62,500 | 64.7% | 36.3% | 11.6% |
| R404 | Rural | 171 | 1 | $62,568 | 50.7% | 24.8% | 13.8% |
Income, owners, families and movers are estimates for each route (how we estimate them); mailbox counts are current USPS figures. Open 78655 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
- 78670 — Staples city, TX (3.6 mi)
- 78622 (4.1 mi)
- 78656 — San Marcos city, TX (6.3 mi)
- 78661 (7.9 mi)
- 78666 — San Marcos city, TX (10.1 mi)
- 78644 — Lockhart city, TX (10.4 mi)
- 78638 — Kingsbury city, TX (11.2 mi)
- 78640 — Kyle city, TX (12.4 mi)
Areas that include 78655
- Martindale, TX ZIP codes — 1 ZIP code
- Staples, TX ZIP codes — 3 ZIP codes
- Caldwell County ZIP codes — 11 ZIP codes
- Guadalupe County ZIP codes — 12 ZIP codes
- Austin ZIP code map — 89 ZIP codes
- Texas ZIP code data
Where it ranks
- No. 24 of 83: highest share of households with children in the Austin area
- No. 12 of 83: highest median age in the Austin area
- No. 20 of 81: fastest population growth in the Austin area
- No. 4 of 9: highest median home value in Caldwell County
- No. 3 of 9: highest share of households with children in Caldwell County
- No. 4 of 9: highest share of residents who moved in during the past year in Caldwell County
- No. 3 of 9: highest median age in Caldwell County
- No. 3 of 8: fastest population growth in Caldwell County
Mail every home in 78655
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) 78655, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.
Frequently asked questions
- What city is 78655 in?
- 78655 is a Martindale, TX mailing address. By land area, 7% lies inside Martindale and 2% lies inside Staples; the rest is outside any Census-defined city or community.
- What county is 78655 in?
- 78655 is mostly in Caldwell County (60% of its land), with smaller parts in Guadalupe County.
- What is the population of 78655?
- About 3,730 people (±758), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 2,910.
- What is the median household income in 78655?
- $55,952 (±$25,708), 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 78655?
- 2 USPS carrier routes with 919 residential and 20 business mailboxes (939 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.
- What ZIP codes are near 78655?
- The closest, measured center to center: 78670 (3.6 mi, Staples), 78622 (4.1 mi), 78656 (6.3 mi, San Marcos), 78661 (7.9 mi), 78666 (10.1 mi, San Marcos) and 78644 (10.4 mi, Lockhart).
This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.