78638 ZIP Code, Kingsbury, TX
78638 is a ZIP code in Kingsbury, Texas in Guadalupe County. It covers 118 square miles of land, centered about 46 miles east of downtown San Antonio. The closest ZIP codes are 78661, 78670 and 78622. 2,135 people live here in 706 households. It is rural, with fewer than 100 people per square mile, and most homes are owner-occupied (79%). Median household income is $69,250, below the Texas median of $78,476; the median age is 45.4, older than most ZIP codes.
Quick facts
- Mailing city: Kingsbury, TX
- County: Guadalupe County
- Metro area: San Antonio
- Land area: 118 sq mi
- Population: 2,135
- Median household income: $69,250
- Carrier routes: 2 (1,121 homes)
Key figures
| Measure | Value |
|---|---|
| Residents | 2,135 |
| Households | 706 |
| Median household income | $69,250 |
| Income per person | $40,200 |
| Median age | 45.4 |
| Homeowners | 79.3% |
| Median home value | $317,400 |
| Median rent | $1,135 |
| Bachelor's degree or higher | 23.5% |
| Average commute (minutes) | 43.3 |
| Households with kids under 18 | 31.6% |
| Moved in the past year | 9.3% |
| Below the poverty line | 8.4% |
| Broadband internet | 87.5% |
| Speak a non-English language at home | 15.5% |
Household income
| % of households | Value |
|---|---|
| <$10K | 2.8% |
| $10–15K | 1.0% |
| $15–25K | 10.9% |
| $25–35K | 5.1% |
| $35–50K | 10.6% |
| $50–75K | 22.7% |
| $75–100K | 8.1% |
| $100–150K | 4.2% |
| $150–200K | 15.0% |
| $200K+ | 19.5% |
Age
| % of all residents | Value |
|---|---|
| <10 | 13.7% |
| 10–19 | 9.8% |
| 20–24 | 2.7% |
| 25–34 | 11.6% |
| 35–44 | 11.3% |
| 45–54 | 11.9% |
| 55–64 | 18.0% |
| 65–74 | 13.7% |
| 75+ | 7.2% |
Tenure
| % of housing units | Value |
|---|---|
| Owned, with mortgage | 35.3% |
| Owned outright | 33.2% |
| Rented | 17.8% |
| Vacant | 13.7% |
Type of building
| % of housing units | Value |
|---|---|
| Detached house | 60.0% |
| Townhome | 0.2% |
| 2–4 units | 0.0% |
| 5–19 units | 0.0% |
| 20+ units | 0.0% |
| Mobile / other | 39.8% |
Businesses in 78638
31 business establishments with 261 employees (ZIP Codes Business Patterns 2023).
- Construction: 13
- Other Services (except Public Administration): 3
EDDM carrier routes
78638 has 2 USPS carrier routes with 1,121 residential and 17 business mailboxes. Open the EDDM route map.
Carrier routes in 78638
78638 has 2 USPS carrier routes (2 rural (R)) with 1,121 residential and 17 business mailboxes. Routes range from 537 homes (R302) to 584 homes (R301); the median route has 561 homes. The Census counted 706 households in 78638 (2020–2024 average); USPS counts current mailboxes, including new and vacant homes.
| Homes per route | Routes |
|---|---|
| 1–249 | 0 |
| 250–499 | 0 |
| 500–749 | 2 |
| 750–999 | 0 |
| 1,000–1,499 | 0 |
| 1,500+ | 0 |
Best routes in 78638 for…
Highest income
For bigger-ticket offers: remodeling, pools, financial planning, private schools.
- Route R302 — Est. median household income $70,642, 537 homes
- Route R301 — Est. median household income $68,209, 584 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 R302 — Est. families with children under 18 28.2%, 537 homes
- Route R301 — Est. families with children under 18 25.4%, 584 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 R302 — Est. owner-occupied homes 82.3%, 537 homes
- Route R301 — Est. owner-occupied homes 75.3%, 584 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 R302 — Est. residents who moved in the past year 9.6%, 537 homes
- Route R301 — Est. residents who moved in the past year 6.8%, 584 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 R302 — Est. homes built 2010 or later 26.6%, 537 homes
- Route R301 — Est. homes built 2010 or later 23.4%, 584 homes
Select these 2 routes on the route map
Most businesses
For B2B offers: office supplies, cleaning, IT, catering and commercial services.
- Route R301 — USPS business mailboxes 9, 584 homes
- Route R302 — USPS business mailboxes 8, 537 homes
Select these 2 routes on the route map
Every carrier route in 78638
| Route | Type | Homes | Businesses | Est. median income | Est. owners | Est. families with kids | Est. moved in past year |
|---|---|---|---|---|---|---|---|
| R301 | Rural | 584 | 9 | $68,209 | 75.3% | 25.4% | 6.8% |
| R302 | Rural | 537 | 8 | $70,642 | 82.3% | 28.2% | 9.6% |
Income, owners, families and movers are estimates for each route (how we estimate them); mailbox counts are current USPS figures. Open 78638 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
- 78661 (4.6 mi)
- 78670 — Staples city, TX (8.2 mi)
- 78622 (8.5 mi)
- 78648 — Luling city, TX (9.1 mi)
- 78658 (10.7 mi)
- 78655 — Martindale city, TX (11.2 mi)
- 78155 — Seguin city, TX (12.4 mi)
- 78122 (14.7 mi)
Areas that include 78638
- Staples, TX ZIP codes — 3 ZIP codes
- Kingsbury, TX ZIP codes — 1 ZIP code
- Guadalupe County ZIP codes — 12 ZIP codes
- San Antonio ZIP code map — 121 ZIP codes
- Texas ZIP code data
Where it ranks
- No. 14 of 104: highest median age in the San Antonio area
- No. 5 of 11: highest median home value in Guadalupe County
- No. 5 of 11: highest share of owner-occupied homes in Guadalupe County
- No. 3 of 11: highest median age in Guadalupe County
Mail every home in 78638
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) 78638, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.
Frequently asked questions
- What city is 78638 in?
- 78638 is a Kingsbury, TX mailing address. By land area, 2% lies inside Kingsbury; the rest is outside any Census-defined city or community.
- What county is 78638 in?
- 78638 is in Guadalupe County.
- What is the population of 78638?
- About 2,135 people (±429), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 2,381.
- What is the median household income in 78638?
- $69,250 (±$21,182), 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 78638?
- 2 USPS carrier routes with 1,121 residential and 17 business mailboxes (1,138 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.
- What ZIP codes are near 78638?
- The closest, measured center to center: 78661 (4.6 mi), 78670 (8.2 mi, Staples), 78622 (8.5 mi), 78648 (9.1 mi, Luling), 78658 (10.7 mi) and 78655 (11.2 mi, Martindale).
This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.