78155 ZIP Code, Seguin, TX

78155 is a ZIP code in Seguin, Texas in Guadalupe County. It covers 355 square miles of land, centered about 34 miles east of downtown San Antonio. The closest ZIP codes are 78123, 78638 and 78124. 55,600 people live here in 21,007 households, more than in 9 of every 10 Texas ZIP codes. With about 156 people per square mile it is lightly settled, and most homes are owner-occupied (73%). Median household income is $71,039, close to the Texas median of $78,476.

Quick facts

Key figures

MeasureValue
Residents55,600
Households21,007
Median household income$71,039
Income per person$36,571
Median age39.4
Homeowners72.5%
Median home value$266,700
Median rent$1,198
Bachelor's degree or higher21.7%
Average commute (minutes)26.5
Households with kids under 1832.6%
Moved in the past year14.4%
Below the poverty line16.9%
Broadband internet91.0%
Speak a non-English language at home28.0%

Household income

% of householdsValue
<$10K5.2%
$10–15K4.7%
$15–25K5.0%
$25–35K9.2%
$35–50K11.8%
$50–75K17.2%
$75–100K11.2%
$100–150K18.1%
$150–200K8.7%
$200K+9.0%

Age

% of all residentsValue
<1011.0%
10–1913.2%
20–246.3%
25–3413.3%
35–4413.1%
45–5412.3%
55–6412.9%
65–7410.4%
75+7.5%

Tenure

% of housing unitsValue
Owned, with mortgage33.7%
Owned outright33.7%
Rented25.3%
Vacant7.4%

Type of building

% of housing unitsValue
Detached house65.7%
Townhome2.0%
2–4 units6.0%
5–19 units4.6%
20+ units2.2%
Mobile / other19.4%

Businesses in 78155

1,065 business establishments with 20,490 employees (ZIP Codes Business Patterns 2023).

EDDM carrier routes

78155 has 35 USPS carrier routes with 26,649 residential and 1,366 business mailboxes. Open the EDDM route map.

Carrier routes in 78155

78155 has 35 USPS carrier routes (14 city (C), 21 rural (R)) with 26,649 residential and 1,366 business mailboxes. Routes range from 432 homes (C014) to 1,539 homes (R012); the median route has 686 homes. The Census counted 21,007 households in 78155 (2020–2024 average); USPS counts current mailboxes, including new and vacant homes.

Homes per routeRoutes
1–2490
250–4993
500–74916
750–99912
1,000–1,4993
1,500+1

Best routes in 78155 for…

Highest income

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

  1. Route R016 — Est. median household income $123,634, 865 homes
  2. Route R020 — Est. median household income $98,931, 1,466 homes
  3. Route R011 — Est. median household income $94,736, 564 homes
  4. Route R012 — Est. median household income $94,102, 1,539 homes
  5. Route R014 — Est. median household income $93,754, 896 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 R011 — Est. families with children under 18 49.4%, 564 homes
  2. Route R018 — Est. families with children under 18 45.5%, 922 homes
  3. Route C009 — Est. families with children under 18 45.4%, 1,117 homes
  4. Route R016 — Est. families with children under 18 44.8%, 865 homes
  5. Route R009 — Est. families with children under 18 40.0%, 648 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 R016 — Est. owner-occupied homes 96.5%, 865 homes
  2. Route R013 — Est. owner-occupied homes 91.1%, 653 homes
  3. Route R003 — Est. owner-occupied homes 90.2%, 575 homes
  4. Route R020 — Est. owner-occupied homes 89.9%, 1,466 homes
  5. Route R004 — Est. owner-occupied homes 89.9%, 546 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 R017 — Est. residents who moved in the past year 26.9%, 900 homes
  2. Route R016 — Est. residents who moved in the past year 23.6%, 865 homes
  3. Route C006 — Est. residents who moved in the past year 22.2%, 912 homes
  4. Route C008 — Est. residents who moved in the past year 18.6%, 804 homes
  5. Route C011 — Est. residents who moved in the past year 18.1%, 923 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 R016 — Est. homes built 2010 or later 71.9%, 865 homes
  2. Route R011 — Est. homes built 2010 or later 39.4%, 564 homes
  3. Route R010 — Est. homes built 2010 or later 37.3%, 623 homes
  4. Route R012 — Est. homes built 2010 or later 36.8%, 1,539 homes
  5. Route R018 — Est. homes built 2010 or later 36.5%, 922 homes

Select these 5 routes on the route map

Most businesses

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

  1. Route C001 — USPS business mailboxes 150, 485 homes
  2. Route C010 — USPS business mailboxes 110, 966 homes
  3. Route C002 — USPS business mailboxes 108, 686 homes
  4. Route C014 — USPS business mailboxes 108, 432 homes
  5. Route C011 — USPS business mailboxes 106, 923 homes

Select these 5 routes on the route map

Every carrier route in 78155

RouteTypeHomesBusinessesEst. median incomeEst. ownersEst. families with kidsEst. moved in past year
C001City485150$43,44263.6%36.7%16.3%
C002City686108$74,00766.2%23.9%9.6%
C005City61220$65,21565.1%32.7%14.3%
C006City91270$58,79451.7%31.1%22.2%
C007City71930$56,38673.0%20.1%7.0%
C008City80462$34,82553.0%35.5%18.6%
C009City1,11798$58,72758.7%45.4%17.2%
C010City966110$88,55680.1%33.7%15.1%
C011City923106$75,25552.4%27.0%18.1%
C012City90414$62,55586.4%29.1%4.0%
C013City80133$47,26658.8%28.1%9.5%
C014City432108$72,78564.7%30.0%17.1%
C017City83586$68,95960.6%32.1%14.7%
C020City75529$55,67152.7%17.9%14.2%
R001Rural5238$90,89079.7%30.7%5.5%
R002Rural6366$85,76980.1%25.8%6.4%
R003Rural5757$77,91690.2%21.4%8.4%
R004Rural54642$79,97689.9%36.5%11.0%
R005Rural54621$85,19581.1%24.0%5.6%
R006Rural52212$85,05787.7%21.4%9.0%
R007Rural55151$77,33679.6%38.1%7.9%
R008Rural63010$59,85187.4%23.5%7.1%
R009Rural64816$90,79687.9%40.0%14.8%
R010Rural62325$71,73484.0%25.9%12.8%
R011Rural56412$94,73681.5%49.4%15.3%
R012Rural1,5394$94,10284.3%39.2%15.6%
R013Rural6538$70,74691.1%30.2%8.2%
R014Rural89624$93,75482.8%35.1%10.9%
R015Rural59029$66,20979.0%25.2%13.0%
R016Rural86517$123,63496.5%44.8%23.6%
R017Rural90029$74,15561.7%31.2%26.9%
R018Rural92214$88,43889.7%45.5%11.7%
R019Rural1,0135$75,39681.6%19.5%8.4%
R020Rural1,4661$98,93189.9%39.8%17.6%
R021Rural4901$69,63372.7%28.1%16.5%

Income, owners, families and movers are estimates for each route (how we estimate them); mailbox counts are current USPS figures. Open 78155 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 78155

Where it ranks

Mail every home in 78155

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) 78155, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.

Frequently asked questions

What city is 78155 in?
78155 is a Seguin, TX mailing address. By land area, 11% lies inside Seguin, 2% lies inside Geronimo and 2% lies inside New Berlin; the rest is outside any Census-defined city or community.
What county is 78155 in?
78155 is in Guadalupe County.
What is the population of 78155?
About 55,600 people (±1,419), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 51,772.
What is the median household income in 78155?
$71,039 (±$5,584), 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 78155?
35 USPS carrier routes with 26,649 residential and 1,366 business mailboxes (28,019 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.
What ZIP codes are near 78155?
The closest, measured center to center: 78123 (7.7 mi, McQueeney), 78638 (12.4 mi, Kingsbury), 78124 (12.7 mi, Zuehl), 78130 (13.4 mi, New Braunfels), 78122 (14.8 mi) and 78121 (15.8 mi, La Vernia).

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