ZIP Code 57779 — St. Onge CDP, SD Demographics & Data

ZIP code 57779 covers St. Onge, SD in Lawrence County with a population of about 300.

At a glance, the area shows median age of 53.7 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%; 70.0% of adults with a bachelor’s degree or higher (about 36.3 points above the national share (33.7%)).

Labor and commute patterns include leading industry context around Wholesale trade, Professional services, and Food services; a mean commute of about 180.0 minutes (U.S. average near 26.8).

Median home value is about $240,500 — about 31% below the U.S. median home value ($348,079).

Housing tenure and rents show owner-occupancy near 100.0% (about 34.6 points above the national owner-occupancy rate (65.4%)).

To comfortably buy a median-priced home in ZIP 57779 in St. Onge, SD, a household would need roughly $66,000 in annual income under a 20% down, 30-year loan at 6.8% (illustrative), keeping housing costs near 28% of income. Estimated monthly PITI is about $1,545. Rates, taxes, insurance, and HOA fees vary — treat this as a planning estimate, not a lender quote.

FEMA’s National Risk Index rates natural-hazard risk for St. Onge CDP, SD as Relatively Low (composite score 49.3), which is near the middle of the national distribution. The strongest component scores on US5 are wildfire (93.2) and flood (57.1). 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 St. Onge CDP, SD show little to no average snow and around 21.4 inches of annual precipitation.

IRS migration statistics show a net inflow of about 18 for ZIP 57779 (St. Onge CDP, 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.