ZIP Code 78338 in Armstrong, TX

Data Last Updated: February 1, 2026
City:Armstrong, Texas
Names to Avoid:
Norias, Rudolph
County:Kenedy County
Timezone:Central (GMT -06:00)
Local Time:9:48:37 AM
Population:50 [See All]
Area Code:361
Classification:PO Box
Coordinates:26.8528, -97.7139
Land Area:51.69 sq mi
Quick Link:
https://www.zip-codes.com/zip-code/78338/zip-code-78338.asp

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78338 Armstrong, TX - Remote South Texas Ranchland

ZIP Code 78338, Armstrong

Tourism Gateway
LocationKenedy County, TX
Area248.9 sq mi
Population50
Households19
PO Boxes4 Low Adoption (21%)
Median Age39.5 years
Seasonal Housing17%
Also Known AsRudolph, Norias
ZIP CreatedBefore Oct 2004
Key Facts
  • This is a PO Box Only Zone and there's no alternative mail delivery across the 249 square mile territory
  • With just 50 residents across 249 square miles, Armstrong is one of Texas's most sparsely populated ZIP codes
  • The post office maintains only 4 PO Boxes for 19 households, with most mail delivered by rural route
  • RUDOLPH and NORIAS are recognized historic names but can't be used for mailing
  • Despite PO Box classification, this ZIP has rural route delivery on Gulf Wind Road

Community Overview

Armstrong sits in the remote grasslands of Kenedy County, Texas, covering 249 square miles of South Texas ranchland. Just 50 people live within this vast territory, making it one of the state's most sparsely populated areas. The Armstrong post office serves as a PO Box Only Zone, meaning there's no alternative mail delivery across the entire 249 square mile area.

Historic Names

This ZIP's history appears in its mailing aliases. RUDOLPH and NORIAS are recognized names but can't be used for mail, likely referencing historic ranches or settlements that once existed in this remote corner of South Texas. Today, Armstrong is the only valid mailing name.

Postal Services

The post office maintains just 4 PO Boxes for 19 households. Most residents receive mail by rural route on Gulf Wind Road, the single named street in the ZIP+4 records. With a median age of 39.5 and a population of 50, this is a working ranchland community where families are spread across vast distances.

Mailing Information

Mail to Armstrong should use the 78338 ZIP code with ARMSTRONG, TX as the city line. The facility code is "N" (non-classified post office), and there's no city carrier delivery. Rural route service covers the limited residential addresses, while PO Boxes serve a small number of box holders.

Street Name Patterns

Minimal Addressing

Only one street appears in ZIP+4 records, indicating minimal address infrastructure in this remote ranchland area.

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Population & Demographics


ZIP Code 78338 has 50 residents and 19 households (average 2.63 persons per household). The median age is 39.5 years, older than the state (35.6) and about the same as the nation (38.8). The gender split is 42.0% male and 58.0% female, which is much lower than the state male share (49.4%), making this a female-majority area. Largest groups are Hispanic or Latino (54.0%) and White (48.0%, much lower than the national average of 61.6%); Hispanic or Latino residents make up 54.0%, which is much higher than the national average (18.7%), and Other / Two or More Races share is much higher than the national average (8.4%).

Explore More:Population Over TimeBy Age & GenderBy RaceBy GenderNativity & Citizenship

Source: U.S. Census 2020 Demographics & Housing Characteristics (DHC) and U.S. Census 2011-2024 American Community Survey (ACS) 5-Year Estimates.
2020 Population:50Source: Census DHC
2024 ACS Population Estimate:36Source: Census ACS
2026 ZC Population Estimate:0Source: ZIP-Codes.com
Population Density:1.0 people per sq mile
Average Income:$0Source: Census ACS
Households:19Source: Census DHC
Average House Value:$666,666,666Source: Census ACS
Persons Per Household:2.63Source: Census DHC
Average Family Size:4.70Source: Census ACS

Population Over Time (with 2010 & 2020 Census Benchmarks)


Group201020112102201320142015201620172018201920202021202220232024
Census ACS Population Estimate--000224563465118000036
Decennial Census37------------------50--------
Source: U.S. Census 2011-2024 American Community Survey 5-Year Estimates. DP05. DEMOGRAPHIC AND HOUSING ESTIMATES

Population by Age & Gender (Total, Male, Female)


Median Age: 39.5

Male Median Age: 41.5

Female Median Age: 27.5

Group< 55-910-1415-1920-2425-2930-3435-3940-4445-4950-5455-5960-6465-6970-7475-7980-8485+
Male002012214021600000
Female126321110133001040
Total128333324154601040
Source: U.S. Census Bureau (2020) Demographics & Housing Characteristics (DHC)

Population by Race


White:2439.34%
Black:00%
Hispanic:*2744.26%
Asian:00%
American Indian:00%
Hawaiian:00%
Other:1016.39%
Total:61100%
Source: U.S. Census Bureau (2020) Demographics & Housing Characteristics (DHC)
* NOTE: Hispanic or Latino is an ethnicity, not a race. This means individuals who identify as Hispanic will also be included in one of the race categories (such as White or Black). As a result, the totals shown here may exceed 100% when Hispanic is displayed alongside racial groups.

Gender Breakdown


GenderCount%Median Age
Males:2142.00%41.5 years
Females:2958.00%27.5 years
Total:50100%39.5 years
Source: U.S. Census Bureau (2020) Demographics & Housing Characteristics (DHC)

Nativity & Citizenship


Native, born in the United States:00%
Native, born in PR, Island Areas, or abroad:00%
Foreign born, naturalized U.S. citizen:00%
Foreign born, not a U.S. citizen:360%
Total Population:36100%
Total Native Population:00%
Total Foreign-born Population:360%
Source: U.S. Census 2020-2024 American Community Survey 5-Year Estimates. Table DP02. SELECTED SOCIAL CHARACTERISTICS
Note: Nativity and Citizenship derived from American Community Survey (ACS) 5-year estimates. Total Population listed here will not match official ZIP Code population totals, which are based on the Decennial Census.

Income & Employment


In 2024, the Median household income is $0, which is well under the national median ($78,538), and above its 2019 pre-pandemic level by $0. Family households earn a median of $0 versus $0 for nonfamily households (a difference of $0). By gender, male median income is $0 and female is $0, which is considerably lower than the national female median ($53,445), with a current gap of $0 that has stayed about the same from 2011 to 2024. The labor-force participation rate is 36.8%, which is far less than the national rate (63.5%). The unemployment rate is 0.0%, which is markedly below the national rate (5.2%). The largest occupation group is Service (100.0%).

Explore More:Income Over TimeHousehold IncomeEmployment StatusBy Occupation

Source: U.S. Census 2011-2024 American Community Survey 5-Year Estimates. Using data from Tables DP02, DP03, DP04 and DP05.

Median Income Over Time (Household, Family, Nonfamily, Male, Female)


Income Type20112012201320142015201620172018201920202021202220232024
Median Household Income$0$0$0$0$0$50,833$53,333$53,125$0$0$0$0$0$0
Median Family Income$0$0$0$0$0$0$0$0$0$0$0$0$0$0
Median NonFamily Income$0$0$0$0$0$0$0$0$0$0$0$0$0$0
Median Male Income$0$0$0$0$0$0$0$0$0$0$0$0$0$0
Median Female Income$0$0$0$0$0$0$0$0$0$0$0$0$0$0
Source: U.S. Census 2011-2024 American Community Survey 5-Year Estimates. DP03. SELECTED ECONOMIC CHARACTERISTICS

Average Household Income


Source: U.S. Census 2020-2024 American Community Survey 5-Year Estimates. Table DP03. SELECTED ECONOMIC CHARACTERISTICS

Employment Status


Employed:736.84%
Unemployed:00.00%
Not In Labor Force:1263.16%
Total:19100%
Source: U.S. Census 2020-2024 American Community Survey 5-Year Estimates. Table DP03. SELECTED ECONOMIC CHARACTERISTICS

Employment by Occupation (Civilian Employed Population, 16 and Over)


Management, business, science, and arts:00.00%
Service:7100.00%
Sales and Office:00.00%
Natural resources, construction, and maintenance:00.00%
Production, transportation, and material moving:00.00%
Total Civilian Employed Population:7100%
Source: U.S. Census 2020-2024 American Community Survey 5-Year Estimates. Table DP03. SELECTED ECONOMIC CHARACTERISTICS.

Housing & Affordability


In 2024, the median home value is $0, which is much lower than the national median ($303,400), and above its 2019 pre-pandemic level by $0. The median gross rent is $0, which is well under the national median ($1,348), and above its 2019 pre-pandemic level by $0. Insufficient data for owner/renter mix. Insufficient data for vacancy rate.

Explore More:Compare Home ValueHome Value Over TimeRent & Over TimeHousing Occupancy

Source: U.S. Census 2011-2024 American Community Survey 5-Year Estimates. Using data from Table DP03, SELECTED ECONOMIC CHARACTERISTICS.

Median Home Value (Comparison)


Source: U.S. Census 2020-2024 American Community Survey 5-Year Estimates. Table DP04. SELECTED HOUSING CHARACTERISTICS

Median Home Value Over Time


Group20112102201320142015201620172018201920202021202220232024
Median Home Value$0$0$0$0$0$0$0$0$0$0$0$0$0$0
Source: U.S. Census 2011-2024 American Community Survey 5-Year Estimates. DP04. SELECTED HOUSING CHARACTERISTICS

Gross Rent Paid


Less than $500:00.00%
$500 to $999:00.00%
$1,000 to $1,499:00.00%
$1,500 to $1,999:7100.00%
$2,000 to $2,499:00.00%
$2,500 to $2,999:00.00%
$3,000 or more:00.00%
No Rent:00.00%
Total:7100%
Source: U.S. Census 2020-2024 American Community Survey 5-Year Estimates. Table DP04. SELECTED HOUSING CHARACTERISTICS

Median Gross Rent Over Time


Group20112102201320142015201620172018201920202021202220232024
Median Rent$0$0$0$0$0$0$0$0$0$0$0$0$0$0
Source: U.S. Census 2011-2024 American Community Survey 5-Year Estimates. DP04. SELECTED HOUSING CHARACTERISTICS

Housing Occupancy


Owner Occupied (with mortgage):00.00%
Owner Occupied (free and clear, no mortgage):00.00%
Renter Occupied:7100.00%
Total Occupied Housing Units:7100%

Occupied Housing Units:770.00%
Vacant Housing Units (not graphed):330.00%
Total Housing Units:10100%
Source: U.S. Census 2020-2024 American Community Survey 5-Year Estimates. Table DP04. SELECTED HOUSING CHARACTERISTICS

Housing Type (Single-Family, Multi-Family, Other)


Single-Family Units:330.00%
Multi-Family Units:770.00%
Other Units:00.00%
Total Housing Units:10100%
Source: U.S. Census 2020-2024 American Community Survey 5-Year Estimates. Table DP04. SELECTED HOUSING CHARACTERISTICS

Education, Health & Community


In 2024, 0.00% of adults (25+) have a bachelor's degree or higher, which is comparable to the national rate (35.00%). High school or higher is 36.80%, which is far lower than the national rate (89.40%). The uninsured rate is 100.00%, which is far higher than the national rate (8.60%). Private coverage is 0.00%, which is far lower than the national rate (67.30%). The share of people in poverty is 0.00%, which is comparable to the national rate (8.70%). Poverty has been broadly stable, which may reflect structural barriers or offsetting gains and setbacks. Among residents ages 3+, the largest enrollment group is elementary (58.82%). College enrollment is 0.00%, which is comparable to the national rate (26.70%), meaning the community mirrors broader higher-education participation.

Explore More:Educational AttainmentHealth InsurancePoverty Over TimeSchool Enrollment

Source: U.S. Census 2011-2024 American Community Survey 5-Year Estimates. Using data from Tables DP02 and DP03.

Educational Attainment of Adults (25 and Older)


Less than 9th grade:1263.16%
9th to 12th grade, no diploma:00.00%
High school graduate (includes equivalency):736.84%
Some college, no degree:00.00%
Associate's degree:00.00%
Bachelor's degree:00.00%
Graduate or professional degree:00.00%
Total:19100%
High school or higher:736.84%
Bachelor's degree or higher:00.00%
Source: U.S. Census 2020-2024 American Community Survey 5-Year Estimates. Table DP02. SELECTED SOCIAL CHARACTERISTICS

Health Insurance Coverage by Type (Private, Public, Uninsured)


Private Insurance:00.00%
Public Insurance:00.00%
No Insurance:36100.00%
Total:36100%
Has Health Insurance:00.00%
Source: U.S. Census 2020-2024 American Community Survey 5-Year Estimates. Table DP03. SELECTED ECONOMIC CHARACTERISTICS

Percentage of People in Poverty Over Time (2011-2024)


Group20112102201320142015201620172018201920202021202220232024
% of People in Poverty0.0%-666,666,666.0%-666,666,666.0%0.0%0.0%0.0%0.0%0.0%0.0%0.0%0.0%0.0%0.0%0.0%
Source: U.S. Census 2011-2024 American Community Survey 5-Year Estimates. DP03. SELECTED ECONOMIC CHARACTERISTICS

Note: Counts of Families & People in poverty are not published at the ZIP Code level due to small sample sizes. Percentages shown are survey estimates from the American Community Survey (ACS). They may differ from official poverty statistics. The U.S. Census Bureau defines poverty status by comparing a family's or individual's total income with federal poverty thresholds that vary by family size and composition.

School Enrollment by Education Level (Ages 3 and Older)


Nursery School, Preschool:00.00%
Kindergarten:00.00%
Elementary school (grades 1-8):1058.82%
High school (grades 9-12):741.18%
College or graduate school:00.00%
Total:17100%
Early Childhood:00.00%
K-12 (Primary & Secondary School):17100.00%
Source: U.S. Census 2020-2024 American Community Survey 5-Year Estimates. Table DP02. SELECTED SOCIAL CHARACTERISTICS

Business & Employment Statistics


ZIP Code 78338 supports both business and residential activity. According to the Business Census (2024), there are 3 business establishments, employing about 42 people with an annual payroll of $3,158,000.

# Residential Mailboxes:0Source: USPS
# Business Mailboxes:0Source: USPS
Total Delivery Receptacles:1,721Source: USPS
Single Family Delivery Units:0Source: USPS
Multi Family Delivery Units:0Source: USPS
# of Businesses:3Source: CBP
1st Quarter Payroll:$707,000Source: CBP
Annual Payroll:$3,158,000Source: CBP
# of Employees:42Source: CBP

Geography, Land Area, & Statistical Classifications


ZIP Code 78338 is located in Kenedy County, Texas, within the Metropolitan Statistical Area (CBSA ) and Texas's 34th Congressional District. This area has a population of 0 people, about 0.00% of whom live in ZIP Code 78338. It covers 51.69 sq mi of land and a water area of 0.014 sq mi.

CBSA Name:--Source: Census
CBSA Number:--Source: Census
CBSA Type:--Source: Census
CBSA Division:--Source: Census
CBSA Population:0Source: Census
MSA:Source: Census
Land Area:51.69 sq miSource: Census
Water Area:0.014 sq miSource: Census
Congressional District:34Source: USPS
Congressional Land Area:8190.32 sq miSource: Census
PMSA:Source: Census
Intro Date:< 2004-10Source: ZIP-Codes.com
Place FIPS Code:--Source: Census
Place Name:--Source: Census

Adjacent & Nearby ZIP Codes


78339 | | 78336

Schools in ZIP Code 78338


We could not locate which school district 78338 belongs to, but we will update this once new district data is released. There are no public schools nor private schools with a mailing address in this ZIP Code. Listing Nearby schools instead. It also has 6 colleges, universities or post secondary education institutions nearby which would be a short commute to.

San Perlita H S E Hwy 186 1 Mi N F M 2209
San Perlita, TX 78590
District: San Perlita Independent School DistrictNearby
San Perlita Middle 1 Mi N F M 2209
San Perlita, TX 78590
District: San Perlita Independent School DistrictNearby
San Perlita El E Hwy 186 1mi N F M 2209
San Perlita, TX 78590
District: San Perlita Independent School DistrictNearby
Smith El 700 Nth 1st St
Raymondville, TX 78580
District: Raymondville Independent School DistrictNearby
Sarita El 150 E La Parra St
Sarita, TX 78385
District: Kenedy County-Wide Common School DistrictNearby
Presbyterian Pan American School 223 N Fm 772
Kingsville, TX 78364
District: Private SchoolNearby
Marine Military Academy 320 Iwo Jima Blvd
Harlingen, TX 78550
District: Private SchoolNearby
Calvary Christian School 1815 N 7th St
Harlingen, TX 78550
District: Private SchoolNearby

Colleges & Post Secondary Schools near ZIP Code 78338


Southern Careers Institute-Harlingen 1122 Morgan Boulevard
Harlingen, TX 78550
Type: Post Secondary
Ucas University Of Cosmetology Arts & Sciences-Harlingen 801 N. 13th Street Suite 2
Harlingen, TX 78550-5034
Type: Post Secondary
The University Of Texas Rio Grande Valley 1201 W University Dr
Edinburg, TX 78539-2999
Type: Post Secondary
Texas A & M University-Kingsville 955 University Blvd
Kingsville, TX 78363
Type: Post Secondary
South Texas Vocational Technical Institute-Weslaco 1600 North Westgate Drive, Suite 400
Weslaco, TX 78599
Type: Post Secondary
Ucas University Of Cosmetology Arts & Sciences-Mcallen 8401 N 10th St
Mcallen, TX 78504
Type: Post Secondary

Sources & References


Our sources include trusted federal and licensed data from the United States Postal Service, U.S. Census Bureau, U.S. Geological Survey, Centers for Medicare & Medicaid Services, and the National Center for Education Statistics, along with proprietary datasets created by ZIP-Codes.com. Data last updated on February 1, 2026.

  1. U.S. Postal Service [Last Updated: 2/1/2026], https://www.usps.com
  2. ZIP-Codes.com Proprietary Data Enhancements [Updated: 2/1/2026], https://www.zip-codes.com
  3. U.S. Census [Updated: Varies], https://www.census.gov
    • U.S. Census Office of Management and Budget [Updated: As Released]
    • U.S. Census 2020 Demographic & Housing Characteristics (DHC) [Decennial] [Updated: 5/25/2023]
    • U.S. Census 2011-2024 American Community Survey 5-year estimates (ACS) [Annually] [Updated: Annually, As Released]
    • U.S. Census Business Patterns (CBD) [Annually] [Updated: Annually, As Released]
    • U.S. Census American National Standards Institute (ANSI) [Updated: As Released]
  4. U.S. Geological Survey [Updated: Varies], https://www.usgs.gov
  5. Centers for Medicare & Medicaid Services [Updated: Annually, As Released], https://www.cms.gov
  6. National Center for Education Statistics [Updated: 2/1/2026], https://nces.ed.gov