ZIP Code 57631 — Glenham town, SD Demographics & Data

ZIP code 57631 covers Glenham, SD in Walworth County with a population of about 365.

At a glance, the area shows median age of 60.5 versus a U.S. median of about 38.9.

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

Glenham, 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.

Median household income in ZIP 57631 is about $56,250 — about 25% below the U.S. median ($75,149).

On socioeconomic markers, US5 shows a poverty rate of 4.4%; unemployment rate near 19.8%; 20.9% of adults with a bachelor’s degree or higher (about 12.8 points below the national share (33.7%)).

Labor and commute patterns include leading industry context around Agriculture, Healthcare, and Education; about 23.9% of workers reporting work-from-home (about 8.7 points above the U.S. share (15.2%)); a mean commute of about 118.0 minutes (U.S. average near 26.8).

Median home value is about $106,700 — about 69% below the U.S. median home value ($348,079).

Housing tenure and rents show owner-occupancy near 90.4% (about 25.0 points above the national owner-occupancy rate (65.4%)).

To comfortably buy a median-priced home in ZIP 57631 in Glenham, SD, a household would need roughly $29,000 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 $685. That sits below the local median household income ($56,250), suggesting the typical household income is closer to a workable buy-in level under these assumptions. 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 Glenham town, SD as Very Low (composite score 39.5), which is relatively lower than many U.S. communities. The strongest component scores on US5 are wildfire (80.7) and flood (34.8). 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 Glenham town, SD show little to no average snow and around 18.0 inches of annual precipitation.

IRS migration statistics show a net inflow of about 22 for ZIP 57631 (Glenham 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.