What to know about ZIP 78540
ZIP code 78540 covers TX in Hidalgo County.
It sits in telephone area code 956; U.S. House district TX-15; the HARLINGEN - WSLCO - BRNSVL - MCA media market.
, TX
ZIP Code 78540 — undefined, TX Demographics & Data
Source: U.S. Census Bureau ACS 2019–2023 5-Year Estimates. Page data updated 2026-08-02.
Map, Quick Facts & Location
Quick Facts
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At a glance
Overview of ZIP Code 78540
Climate risk and migration signals
FEMA’s National Risk Index rates natural-hazard risk for TX as Relatively High (composite score 99.0), which is among the highest nationally. The strongest component scores on US5 are hurricane (99.5) and flood (96.4). These scores are county-linked NRI values published for planning context — all ZIP codes in the same county share the same composite score on US5. Useful when comparing insurance and disaster exposure across areas, not a substitute for a parcel-level flood or fire determination.
Climate normals for TX show limited published climate normals on US5.