ZIP Code 57640 — undefined, SD Demographics & Data

ZIP code 57640 covers SD in Perkins County with a population of about 50.

At a glance, the area shows median age of 48.7 versus a U.S. median of about 38.9.

It sits in telephone area code 605; U.S. House district SD-00; the RAPID CITY media market.

On socioeconomic markers, US5 shows a poverty rate of 0.0%; unemployment rate near 0.0%; 52.3% of adults with a bachelor’s degree or higher (about 18.6 points above the national share (33.7%)).

Labor and commute patterns include leading industry context around Agriculture and Healthcare; about 42.4% of workers reporting work-from-home (about 27.2 points above the U.S. share (15.2%)); a mean commute of about 19.0 minutes (U.S. average near 26.8).

Housing tenure and rents show owner-occupancy near 55.2% (about 10.2 points below the national owner-occupancy rate (65.4%)).

FEMA’s National Risk Index rates natural-hazard risk for SD as Very Low (composite score 2.6), which is relatively lower than many U.S. communities. The strongest component scores on US5 are wildfire (68.8) and flood (4.7). 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 SD show little to no average snow and around 16.9 inches of annual precipitation.

IRS migration statistics show a net inflow of about 3 for ZIP 57640 (SD) 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.