78631 ZIP Code, Harper, TX
78631 is a ZIP code in Harper, Texas — mostly in Kimble County (49% of its land), with smaller parts in Gillespie and Kerr counties. It covers 300 square miles of land. The closest ZIP codes are 78618, 78025 and 76854. 3,465 people live here in 1,269 households. It is rural, with fewer than 100 people per square mile, and most homes are owner-occupied (84%). Median household income is $78,560, close to the Texas median of $78,476; 41% of households have children under 18.
Quick facts
- Mailing city: Harper, TX
- County: Kimble County
- Land area: 300 sq mi
- Population: 3,465
- Median household income: $78,560
- Carrier routes: 4 (1,115 homes)
Key figures
| Measure | Value |
|---|---|
| Residents | 3,465 |
| Households | 1,269 |
| Median household income | $78,560 |
| Income per person | $35,226 |
| Median age | 43.4 |
| Homeowners | 84.2% |
| Median home value | $351,600 |
| Median rent | $1,304 |
| Bachelor's degree or higher | 24.0% |
| Average commute (minutes) | 29.9 |
| Households with kids under 18 | 41.2% |
| Moved in the past year | 5.0% |
| Below the poverty line | 11.1% |
| Broadband internet | 92.1% |
| Speak a non-English language at home | 11.6% |
Household income
| % of households | Value |
|---|---|
| <$10K | 2.5% |
| $10–15K | 4.1% |
| $15–25K | 8.6% |
| $25–35K | 12.0% |
| $35–50K | 8.7% |
| $50–75K | 11.7% |
| $75–100K | 11.2% |
| $100–150K | 19.9% |
| $150–200K | 13.3% |
| $200K+ | 8.0% |
Age
| % of all residents | Value |
|---|---|
| <10 | 7.0% |
| 10–19 | 15.9% |
| 20–24 | 2.7% |
| 25–34 | 8.5% |
| 35–44 | 17.8% |
| 45–54 | 8.0% |
| 55–64 | 14.6% |
| 65–74 | 17.9% |
| 75+ | 7.7% |
Tenure
| % of housing units | Value |
|---|---|
| Owned, with mortgage | 22.6% |
| Owned outright | 45.5% |
| Rented | 12.8% |
| Vacant | 19.2% |
Type of building
| % of housing units | Value |
|---|---|
| Detached house | 60.7% |
| Townhome | 1.3% |
| 2–4 units | 0.0% |
| 5–19 units | 0.0% |
| 20+ units | 0.0% |
| Mobile / other | 37.9% |
Businesses in 78631
54 business establishments with 194 employees (ZIP Codes Business Patterns 2023).
- Construction: 15
- Retail Trade: 6
- Administrative and Support and Waste Management and Remediation Services: 6
- Other Services (except Public Administration): 5
- Accommodation and Food Services: 4
- Professional, Scientific, and Technical Services: 3
EDDM carrier routes
78631 has 4 USPS carrier routes with 1,115 residential and 16 business mailboxes. Open the EDDM route map.
Carrier routes in 78631
78631 has 4 USPS carrier routes (4 highway contract (H)) with 1,115 residential and 16 business mailboxes. Routes range from 156 homes (H011) to 402 homes (H004); the median route has 279 homes. The Census counted 1,269 households in 78631 (2020–2024 average); USPS counts current mailboxes, including new and vacant homes.
| Homes per route | Routes |
|---|---|
| 1–249 | 2 |
| 250–499 | 2 |
| 500–749 | 0 |
| 750–999 | 0 |
| 1,000–1,499 | 0 |
| 1,500+ | 0 |
Best routes in 78631 for…
Highest income
For bigger-ticket offers: remodeling, pools, financial planning, private schools.
- Route H011 — Est. median household income $97,883, 156 homes
- Route H063 — Est. median household income $91,391, 335 homes
- Route H064 — Est. median household income $88,290, 222 homes
- Route H004 — Est. median household income $83,481, 402 homes
Select these 4 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 H004 — Est. families with children under 18 25.8%, 402 homes
- Route H064 — Est. families with children under 18 20.8%, 222 homes
- Route H063 — Est. families with children under 18 19.2%, 335 homes
- Route H011 — Est. families with children under 18 13.8%, 156 homes
Select these 4 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 H063 — Est. owner-occupied homes 87.4%, 335 homes
- Route H064 — Est. owner-occupied homes 86.5%, 222 homes
- Route H011 — Est. owner-occupied homes 85.0%, 156 homes
- Route H004 — Est. owner-occupied homes 84.5%, 402 homes
Select these 4 routes on the route map
Often mailed by: Roofing direct mail, HVAC postcards
Newest homes
Newer subdivisions: landscaping, window treatments, fencing, security, home warranties.
- Route H064 — Est. homes built 2010 or later 25.0%, 222 homes
- Route H063 — Est. homes built 2010 or later 24.0%, 335 homes
- Route H004 — Est. homes built 2010 or later 23.1%, 402 homes
- Route H011 — Est. homes built 2010 or later 20.7%, 156 homes
Select these 4 routes on the route map
Most businesses
For B2B offers: office supplies, cleaning, IT, catering and commercial services.
- Route H011 — USPS business mailboxes 9, 156 homes
- Route H004 — USPS business mailboxes 3, 402 homes
- Route H063 — USPS business mailboxes 2, 335 homes
- Route H064 — USPS business mailboxes 2, 222 homes
Select these 4 routes on the route map
Every carrier route in 78631
| Route | Type | Homes | Businesses | Est. median income | Est. owners | Est. families with kids | Est. moved in past year |
|---|---|---|---|---|---|---|---|
| H004 | Highway contract | 402 | 3 | $83,481 | 84.5% | 25.8% | — |
| H011 | Highway contract | 156 | 9 | $97,883 | 85.0% | 13.8% | — |
| H063 | Highway contract | 335 | 2 | $91,391 | 87.4% | 19.2% | — |
| H064 | Highway contract | 222 | 2 | $88,290 | 86.5% | 20.8% | — |
Income, owners, families and movers are estimates for each route (how we estimate them); mailbox counts are current USPS figures. Open 78631 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
- 78618 (13 mi)
- 78025 — Ingram city, TX (18.1 mi)
- 76854 (19.9 mi)
- 78028 — Kerrville city, TX (22.6 mi)
- 78058 (23.9 mi)
- 76856 — Mason city, TX (24.4 mi)
Areas that include 78631
- Harper, TX ZIP codes — 1 ZIP code
- Gillespie County ZIP codes — 6 ZIP codes
- Kimble County ZIP codes — 5 ZIP codes
- Texas ZIP code data
Mail every home in 78631
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) 78631, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.
Frequently asked questions
- What city is 78631 in?
- 78631 is a Harper, TX mailing address. By land area, 19% lies inside Harper; the rest is outside any Census-defined city or community.
- What county is 78631 in?
- 78631 is mostly in Kimble County (49% of its land), with smaller parts in Gillespie and Kerr counties.
- What is the population of 78631?
- About 3,465 people (±593), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 2,698.
- What is the median household income in 78631?
- $78,560 (±$40,726), 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 78631?
- 4 USPS carrier routes with 1,115 residential and 16 business mailboxes (1,129 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.
- What ZIP codes are near 78631?
- The closest, measured center to center: 78618 (13 mi), 78025 (18.1 mi, Ingram), 76854 (19.9 mi), 78028 (22.6 mi, Kerrville), 78058 (23.9 mi) and 76856 (24.4 mi, Mason).
This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.