78566 ZIP Code, Los Fresnos, TX

78566 is a ZIP code in Los Fresnos, Texas in Cameron County. It covers 139 square miles of land. The closest ZIP codes are 78578, 78526 and 78583. 25,110 people live here in 7,241 households. With about 181 people per square mile it is lightly settled, and most homes are owner-occupied (75%). Median household income is $60,187, below the Texas median of $78,476; 51% of households have children under 18.

Quick facts

Key figures

MeasureValue
Residents25,110
Households7,241
Median household income$60,187
Income per person$24,638
Median age33
Homeowners75.0%
Median home value$154,300
Median rent$891
Bachelor's degree or higher21.4%
Average commute (minutes)27.1
Households with kids under 1851.4%
Moved in the past year6.3%
Below the poverty line29.9%
Broadband internet91.0%
Speak a non-English language at home72.8%

Household income

% of householdsValue
<$10K8.8%
$10–15K3.8%
$15–25K11.2%
$25–35K10.7%
$35–50K10.3%
$50–75K13.2%
$75–100K11.4%
$100–150K14.2%
$150–200K11.5%
$200K+4.8%

Age

% of all residentsValue
<1014.8%
10–1921.9%
20–246.2%
25–349.8%
35–4415.4%
45–5412.8%
55–648.7%
65–746.0%
75+4.6%

Tenure

% of housing unitsValue
Owned, with mortgage27.2%
Owned outright38.7%
Rented21.9%
Vacant12.2%

Type of building

% of housing unitsValue
Detached house76.7%
Townhome1.3%
2–4 units1.5%
5–19 units3.1%
20+ units3.7%
Mobile / other13.6%

Businesses in 78566

170 business establishments with 3,498 employees (ZIP Codes Business Patterns 2023).

EDDM carrier routes

78566 has 11 USPS carrier routes with 8,016 residential and 306 business mailboxes. Open the EDDM route map.

Carrier routes in 78566

78566 has 11 USPS carrier routes (2 city (C), 9 rural (R)) with 8,016 residential and 306 business mailboxes. Routes range from 433 homes (R021) to 1,084 homes (C001); the median route has 694 homes. The Census counted 7,241 households in 78566 (2020–2024 average); USPS counts current mailboxes, including new and vacant homes.

Homes per routeRoutes
1–2490
250–4992
500–7495
750–9993
1,000–1,4991
1,500+0

Best routes in 78566 for…

Highest income

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

  1. Route R013 — Est. median household income $88,339, 480 homes
  2. Route R012 — Est. median household income $78,577, 613 homes
  3. Route R009 — Est. median household income $77,178, 694 homes
  4. Route C002 — Est. median household income $69,146, 838 homes
  5. Route C001 — Est. median household income $60,466, 1,084 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 R018 — Est. families with children under 18 61.3%, 898 homes
  2. Route R009 — Est. families with children under 18 56.9%, 694 homes
  3. Route C001 — Est. families with children under 18 51.5%, 1,084 homes
  4. Route R012 — Est. families with children under 18 51.2%, 613 homes
  5. Route C002 — Est. families with children under 18 50.5%, 838 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 R013 — Est. owner-occupied homes 94.1%, 480 homes
  2. Route R009 — Est. owner-occupied homes 87.6%, 694 homes
  3. Route R012 — Est. owner-occupied homes 86.6%, 613 homes
  4. Route R006 — Est. owner-occupied homes 84.5%, 742 homes
  5. Route R015 — Est. owner-occupied homes 80.2%, 666 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 C001 — Est. residents who moved in the past year 9.6%, 1,084 homes
  2. Route R021 — Est. residents who moved in the past year 8.6%, 433 homes
  3. Route R013 — Est. residents who moved in the past year 8.3%, 480 homes
  4. Route R012 — Est. residents who moved in the past year 6.9%, 613 homes
  5. Route R014 — Est. residents who moved in the past year 5.6%, 975 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 C002 — Est. homes built 2010 or later 37.0%, 838 homes
  2. Route R012 — Est. homes built 2010 or later 32.4%, 613 homes
  3. Route R020 — Est. homes built 2010 or later 27.8%, 593 homes
  4. Route R021 — Est. homes built 2010 or later 27.1%, 433 homes
  5. Route R006 — Est. homes built 2010 or later 26.2%, 742 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 149, 1,084 homes
  2. Route R020 — USPS business mailboxes 52, 593 homes
  3. Route C002 — USPS business mailboxes 40, 838 homes
  4. Route R013 — USPS business mailboxes 17, 480 homes
  5. Route R006 — USPS business mailboxes 13, 742 homes

Select these 5 routes on the route map

Every carrier route in 78566

RouteTypeHomesBusinessesEst. median incomeEst. ownersEst. families with kidsEst. moved in past year
C001City1,084149$60,46667.1%51.5%9.6%
C002City83840$69,14671.0%50.5%5.5%
R006Rural74213$60,14684.5%45.3%0.2%
R009Rural6943$77,17887.6%56.9%5.5%
R012Rural6132$78,57786.6%51.2%6.9%
R013Rural48017$88,33994.1%41.4%8.3%
R014Rural9755$52,27172.2%44.8%5.6%
R015Rural6666$46,70380.2%47.1%3.5%
R018Rural8986$45,84576.8%61.3%5.6%
R020Rural59352$57,50174.3%43.8%2.1%
R021Rural43313$55,55673.7%43.3%8.6%

Income, owners, families and movers are estimates for each route (how we estimate them); mailbox counts are current USPS figures. Open 78566 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 78566

Where it ranks

Mail every home in 78566

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) 78566, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.

Frequently asked questions

What city is 78566 in?
78566 is a Los Fresnos, TX mailing address. By land area, 12% lies inside Brownsville, 3% lies inside Laureles, 3% lies inside Los Fresnos and 3% lies inside Bayview; the rest is outside any Census-defined city or community.
What county is 78566 in?
78566 is in Cameron County.
What is the population of 78566?
About 25,110 people (±1,939), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 23,704.
What is the median household income in 78566?
$60,187 (±$8,841), 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 78566?
11 USPS carrier routes with 8,016 residential and 306 business mailboxes (8,322 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.
What ZIP codes are near 78566?
The closest, measured center to center: 78578 (8.2 mi, Brownsville), 78526 (10.5 mi, Brownsville), 78583 (11.5 mi, La Tina Ranch), 78597 (11.7 mi, South Padre Island), 78575 (12.3 mi, Brownsville) and 78521 (14.1 mi, Brownsville).

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