78009 ZIP Code, Castroville, TX

78009 is a ZIP code in Castroville, Texas in Medina County. It covers 70 square miles of land, centered about 24 miles west of downtown San Antonio. The closest ZIP codes are 78039, 78066 and 78245. 9,151 people live here in 2,980 households. With about 130 people per square mile it is lightly settled, and most homes are owner-occupied (86%). Median household income is $103,125, above the Texas median of $78,476.

Quick facts

Key figures

MeasureValue
Residents9,151
Households2,980
Median household income$103,125
Income per person$41,228
Median age43.1
Homeowners86.0%
Median home value$368,700
Median rent$1,250
Bachelor's degree or higher29.9%
Average commute (minutes)29.8
Households with kids under 1831.9%
Moved in the past year13.2%
Below the poverty line4.2%
Broadband internet94.6%
Speak a non-English language at home26.7%

Household income

% of householdsValue
<$10K3.4%
$10–15K1.1%
$15–25K4.3%
$25–35K3.2%
$35–50K9.5%
$50–75K12.3%
$75–100K15.9%
$100–150K23.0%
$150–200K15.5%
$200K+11.9%

Age

% of all residentsValue
<1010.7%
10–1910.9%
20–2410.4%
25–349.5%
35–449.6%
45–5416.3%
55–6415.4%
65–7410.2%
75+6.7%

Tenure

% of housing unitsValue
Owned, with mortgage40.2%
Owned outright35.6%
Rented12.1%
Vacant12.1%

Type of building

% of housing unitsValue
Detached house75.6%
Townhome0.4%
2–4 units5.3%
5–19 units1.4%
20+ units0.4%
Mobile / other16.8%

Businesses in 78009

204 business establishments with 2,074 employees (ZIP Codes Business Patterns 2023).

EDDM carrier routes

78009 has 6 USPS carrier routes with 3,998 residential and 282 business mailboxes. Open the EDDM route map.

Carrier routes in 78009

78009 has 6 USPS carrier routes (4 rural (R), 2 highway contract (H)) with 3,998 residential and 282 business mailboxes. Routes range from 347 homes (R006) to 999 homes (R004); the median route has 625 homes. The Census counted 2,980 households in 78009 (2020–2024 average); USPS counts current mailboxes, including new and vacant homes.

Homes per routeRoutes
1–2490
250–4993
500–7490
750–9993
1,000–1,4990
1,500+0

Best routes in 78009 for…

Highest income

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

  1. Route H002 — Est. median household income $133,438, 475 homes
  2. Route R006 — Est. median household income $124,751, 347 homes
  3. Route H006 — Est. median household income $122,087, 927 homes
  4. Route R003 — Est. median household income $92,710, 764 homes
  5. Route R005 — Est. median household income $89,850, 486 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 H002 — Est. families with children under 18 53.1%, 475 homes
  2. Route R004 — Est. families with children under 18 36.7%, 999 homes
  3. Route R006 — Est. families with children under 18 34.6%, 347 homes
  4. Route H006 — Est. families with children under 18 34.1%, 927 homes
  5. Route R003 — Est. families with children under 18 27.4%, 764 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 H002 — Est. owner-occupied homes 98.5%, 475 homes
  2. Route R005 — Est. owner-occupied homes 88.7%, 486 homes
  3. Route R004 — Est. owner-occupied homes 87.7%, 999 homes
  4. Route H006 — Est. owner-occupied homes 85.3%, 927 homes
  5. Route R006 — Est. owner-occupied homes 84.7%, 347 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 R003 — Est. residents who moved in the past year 16.8%, 764 homes
  2. Route H006 — Est. residents who moved in the past year 16.3%, 927 homes
  3. Route H002 — Est. residents who moved in the past year 16.1%, 475 homes
  4. Route R006 — Est. residents who moved in the past year 14.4%, 347 homes
  5. Route R004 — Est. residents who moved in the past year 10.0%, 999 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 R006 — Est. homes built 2010 or later 51.6%, 347 homes
  2. Route H006 — Est. homes built 2010 or later 47.3%, 927 homes
  3. Route R005 — Est. homes built 2010 or later 26.2%, 486 homes
  4. Route R004 — Est. homes built 2010 or later 23.8%, 999 homes
  5. Route R003 — Est. homes built 2010 or later 20.8%, 764 homes

Select these 5 routes on the route map

Most businesses

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

  1. Route R005 — USPS business mailboxes 125, 486 homes
  2. Route R003 — USPS business mailboxes 71, 764 homes
  3. Route H006 — USPS business mailboxes 52, 927 homes
  4. Route H002 — USPS business mailboxes 22, 475 homes
  5. Route R006 — USPS business mailboxes 10, 347 homes

Select these 5 routes on the route map

Every carrier route in 78009

RouteTypeHomesBusinessesEst. median incomeEst. ownersEst. families with kidsEst. moved in past year
H002Highway contract47522$133,43898.5%53.1%16.1%
H006Highway contract92752$122,08785.3%34.1%16.3%
R003Rural76471$92,71081.2%27.4%16.8%
R004Rural9992$80,97287.7%36.7%10.0%
R005Rural486125$89,85088.7%23.8%8.9%
R006Rural34710$124,75184.7%34.6%14.4%

Income, owners, families and movers are estimates for each route (how we estimate them); mailbox counts are current USPS figures. Open 78009 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 78009

Where it ranks

Mail every home in 78009

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) 78009, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.

Frequently asked questions

What city is 78009 in?
78009 is a Castroville, TX mailing address. By land area, 4% lies inside Castroville; the rest is outside any Census-defined city or community.
What county is 78009 in?
78009 is in Medina County.
What is the population of 78009?
About 9,151 people (±989), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 8,715.
What is the median household income in 78009?
$103,125 (±$13,795), 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 78009?
6 USPS carrier routes with 3,998 residential and 282 business mailboxes (4,283 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.
What ZIP codes are near 78009?
The closest, measured center to center: 78039 (5.1 mi, LaCoste), 78066 (8.7 mi), 78245 (9.1 mi, San Antonio), 78253 (9.4 mi, San Antonio), 78002 (10.8 mi, Macdona) and 78252 (12.2 mi, San Antonio).

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