ZIP Code 57646 — Mound City town, SD Demographics & Data

ZIP code 57646 covers Mound City, SD in Campbell County with a population of about 248.

At a glance, the area shows median age of 37.6 (near the U.S. median).

It sits in telephone area code 605; U.S. House district SD-00; the SIOUX FALLS (MITCHELL) media market.

Mound City, SD is tagged as a Tribal Nation community context (place names indicate a tribal nation community). Local search often includes tribal government offices, public safety, and Indian Health Service (IHS) / wellness topics alongside standard ZIP demographics.

On socioeconomic markers, US5 shows a poverty rate of 14.5%; unemployment rate near 0.0%; 42.3% of adults with a bachelor’s degree or higher (about 8.6 points above the national share (33.7%)).

Labor and commute patterns include leading industry context around Education, Agriculture, and Finance and insurance; about 47.9% of workers reporting work-from-home (about 32.7 points above the U.S. share (15.2%)); a mean commute of about 61.0 minutes (U.S. average near 26.8).

Median home value is about $101,400 — about 71% below the U.S. median home value ($348,079).

Housing tenure and rents show owner-occupancy near 85.8% (about 20.4 points above the national owner-occupancy rate (65.4%)).

To comfortably buy a median-priced home in ZIP 57646 in Mound City, SD, a household would need roughly $28,000 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 $651. 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 Mound City town, SD as Very Low (composite score 4.4), which is relatively lower than many U.S. communities. The strongest component scores on US5 are wildfire (77.5) and flood (8.7). 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 Mound City town, SD show little to no average snow and around 19.2 inches of annual precipitation.

IRS migration statistics show a net inflow of about 15 for ZIP 57646 (Mound City town, 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.