ZIP Code 98558 — McKenna CDP, WA Demographics & Data

ZIP code 98558 covers McKenna, WA in Pierce County with a population of about 61.

At a glance, the area shows median age of 89.7 versus a U.S. median of about 38.9.

It sits in telephone area codes 360, 564; U.S. House district WA-8; the SEATTLE - TACOMA media market.

McKenna, WA reads as a military / base-oriented community on US5’s intent model (elevated veteran share (42.6%) and/or base-related place names). Service members and families often look up Basic Allowance for Housing (BAH) rates, on-base mail (PSC / P.O. Box) addresses, and nearby ZIP demographics when relocating.

US5 shows 2026 DoD BAH locality rates for this ZIP’s Military Housing Area on this page (pay grade × with/without dependents). Treat the table as a planning reference and confirm entitlement with your finance office or the official DTMO BAH lookup.

On socioeconomic markers, US5 shows a poverty rate of 36.4%; unemployment rate near 100.0%; 22.9% of adults with a bachelor’s degree or higher (about 10.8 points below the national share (33.7%)).

FEMA’s National Risk Index rates natural-hazard risk for McKenna CDP, WA as Relatively High (composite score 98.5), which is among the highest nationally. The strongest component scores on US5 are flood (96.2) and wildfire (76.8). 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 McKenna CDP, WA show little to no average snow and around 50.6 inches of annual precipitation.

IRS migration statistics show a net inflow of about 3 for ZIP 98558 (McKenna CDP, WA) 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.