Oldest ZIP codes in Brownsville, TX
These are the 6 ZIP codes in Brownsville, TX with the highest median age, out of 6 with at least 1,000 residents. 78578 (Port Isabel, 49.0), 78575 (Olmito, 38.2) and 78566 (Los Fresnos, 33.0) lead the list. There is no single "best" ZIP code in Brownsville; the right one depends on who you want to reach, so the same ZIP codes are ranked several ways below.
Oldest ZIP codes in Brownsville
| Rank | ZIP | Mailing city | Median age | Residents | Households | Residential mailboxes |
|---|---|---|---|---|---|---|
| 1 | 78578 | Port Isabel | 49.0 ±5.1 | 10,016 | 4,379 | 4,061 |
| 2 | 78575 | Olmito | 38.2 ±5.1 | 4,575 | 1,620 | 2,689 |
| 3 | 78566 | Los Fresnos | 33.0 ±3.6 | 25,110 | 7,241 | 8,016 |
| 4 | 78520 | Brownsville | 31.9 ±1.0 | 64,740 | 20,847 | 22,917 |
| 5 | 78521 | Brownsville | 31.3 ±1.3 | 87,380 | 27,731 | 31,923 |
| 6 | 78526 | Brownsville | 29.7 ±1.1 | 60,012 | 17,516 | 18,847 |
How we ranked them
Ranked by median age of all residents, highest first (ACS 5-year estimates, 2020–2024). ZIP codes need at least 1,000 residents to be ranked; 6 of 6 qualify.
Which of these to mail, and why
Older ZIP codes respond to health care, hearing and vision, Medicare plans, home safety, estate planning and services that come to the door.
The top five ZIP codes on this list hold 61,818 households, on 89 carrier routes with 69,606 residential mailboxes. Open any of them on the route map to see each carrier route's own figures before you choose.
Open 78578 on the EDDM route map
More rankings
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- ZIP codes with the most families with kids in Brownsville
- ZIP codes with the most new movers in Brownsville
- Youngest ZIP codes in Brownsville
- Fastest-growing ZIP codes in Brownsville
- Oldest ZIP codes in Cameron County
- All Brownsville ZIP codes
Businesses that mail these ZIP codes
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EDDM guides
Frequently asked questions
- Which ZIP code in Brownsville has the highest median age?
- 78578 (Port Isabel), at 49.0 (±5.1), among 6 ZIP codes with at least 1,000 residents.
- How is this ranking calculated?
- Ranked by median age of all residents, highest first (ACS 5-year estimates, 2020–2024).
- Why are some ZIP codes missing?
- ZIP codes with fewer than 1,000 residents are left out because their survey estimates swing too much to rank, and so are ZIP codes where the Census Bureau did not publish this figure.
This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.