Zip Code 78578 — Port Isabel, TX

ZIP Code 78578 is associated with Port Isabel, TX, in Cameron County. The listed population estimate is 10,016; estimated density is 67.9 people per square mile. Among records with population estimates, it ranks #9 of 16 in Cameron County and #821 of 1,924 in TX.
Page generated: 2026-10-08. This is not the source data release date.

📍 View location on OpenStreetMap (26.053360, -97.310040)

Data MetricLocal Statistic
Postal / Zip Code78578
Primary CityPort Isabel
State / ProvinceTX
CountyCameron
Total Population10,016
Population Density67.9 people/sq mi
TimezoneAmerica/Chicago

How 78578 Compares

MetricZIP 78578Cameron County recordsTX records
Population estimate10,016425,684 (sum)30,188,035 (sum)
Population Density67.9 /sq mi----
County population rank#9 of 16----
State population rank#821 of 1,924----

Regional sums combine the population estimates in the listed ZIP records; they are not official county or state population totals.

Explore More ZIP Codes

Nearby ZIP Codes in TX

ZIP CodeCityDistancePopulation estimate
ZIP 78521Brownsville7.1 mi87,380
ZIP 78566Los Fresnos9.0 mi25,110
ZIP 78526Brownsville9.5 mi60,012
ZIP 78575Olmito15.0 mi4,575
ZIP 78597South Padre Island15.1 mi2,935

Data Sources & Methodology: Geographic coordinates and ZIP Code assignments are derived from underlying geographic and postal datasets. Note that ZIP Codes are USPS postal delivery areas, while Census ZCTAs are statistical approximation areas. Read full methodology →