ZIP Code 77470 — Rock Island CDP, TX Demographics & Data

ZIP code 77470 covers Rock Island, TX in Colorado County with a population of about 381.

At a glance, the area shows median age of 40.0 (near the U.S. median).

It sits in telephone area code 979; U.S. House district TX-10; the HOUSTON media market.

Median household income in ZIP 77470 is about $38,977 — about 48% below the U.S. median ($75,149).

On socioeconomic markers, US5 shows a poverty rate of 22.1%; unemployment rate near 27.3%; 12.1% of adults with a bachelor’s degree or higher (about 21.6 points below the national share (33.7%)).

Labor and commute patterns include leading industry context around Retail trade, Education, and Agriculture; a mean commute of about 101.0 minutes (U.S. average near 26.8).

Housing tenure and rents show owner-occupancy near 80.0% (about 14.6 points above the national owner-occupancy rate (65.4%)).

FEMA’s National Risk Index rates natural-hazard risk for Rock Island CDP, TX as Relatively Low (composite score 62.2), which is near the middle of the national distribution. The strongest component scores on US5 are hurricane (88.0) and flood (51.0). 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 Rock Island CDP, TX show little to no average snow and around 45.0 inches of annual precipitation.

IRS migration statistics show a net inflow of about 18 for ZIP 77470 (Rock Island CDP, TX) on US5’s published series — a signal of people/tax filers moving in relative to those leaving. Inflows often track job growth, housing demand, or lifestyle migration; treat the figure as a directional indicator rather than a precise headcount.