ZIP 78578 Housing Market Update: Inventory, Pricing Signals, and Mortgage Rates

ZIP 78578 (Port Isabel as the USPS preferred city, Cameron County, TX) continues to look more buyer-friendly than many Texas markets, with inventory showing up across major portals and homes generally taking time to move.

Top takeaways

Home values are roughly flat to slightly down year over year: Zillow’s typical value is $253,785 (data through Jan. 31, 2026), down 0.8% YoY.
Inventory is meaningfully available: Zillow shows 169 homes for sale and 28 new listings for Jan. 2026; Realtor.com’s ZIP dashboard reports 131 active listings for Dec. 2025.
Sellers are negotiating: the sale-to-list ratio was 98% in Dec. 2025 (about 2% below asking on average).
Mortgage rates eased again: Freddie Mac’s 30-year fixed average was 6.01% as of Feb. 19, 2026.

Market snapshot

On the pricing side, Realtor.com’s ZIP-level market summary for Dec. 2025 puts the median home price at $324,000 and $235 per square foot, with a median 85 days on market and a buyer’s-market label for the period. Zillow’s ZIP trends page also shows a recent median sale price of $331,833 (Dec. 2025) and a median list price of $315,650 (Jan. 2026). Keep in mind each portal measures slightly differently, but the common theme is slower turnover and more room to negotiate.

Rentals

Rentals remain a big budget item near the coast. Realtor.com shows a median rent of $2,300/month with 23 rental properties in the ZIP (Dec. 2025 reporting period). If you’re comparing rent vs. buy, run the math with current rates and be realistic about insurance, HOA, and maintenance in a salt-air environment.

What’s for sale this week (no addresses)

Listings in 78578 span everything from smaller condo units in the low-to-mid $100s to single-family homes in the $300k range and up, depending on size and proximity to the water. As one example of current pricing, a 2-bed/2-bath single-family home in Port Isabel was listed around $360,000 in early February. Recent sale records also show a mix of condo and single-family closings in early February, suggesting buyers are still transacting, just not at lightning speed.

ServiceXTC local pros

We weren’t able to confirm active ServiceXTC directory pages for ZIP 78578 at publish time, so we’re skipping specific pro spotlights today. If you’re getting a property ready to list (or buying and planning repairs), the most in-demand categories this time of year tend to be home inspection, roofing, HVAC, electrical, plumbing, painting, and handyman help.

Question for locals: Are you seeing more price cuts and longer days on market in Port Isabel/Laguna Vista, or are well-priced homes still going quickly?

Sources

UnitedStatesZipCodes: ZIP 78578 profile (preferred city and county)
Zillow: 78578 housing market trends (ZHVI, inventory, list/sale prices)
Realtor.com: ZIP 78578 market summary (prices, inventory, days on market, rents, sale-to-list)
Freddie Mac PMMS: weekly mortgage rate averages
Homes.com: Port Isabel, TX recently sold homes (Feb. 2026 examples)
Compass: example active listing (Feb. 2026)