ZIP Code 57440 — Frankfort city, SD Demographics & Data

ZIP code 57440 covers Frankfort, SD in Spink County with a population of about 476.

At a glance, the area shows median age of 45.1 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.

Frankfort, 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 57440 is about $61,563 — about 18% below the U.S. median ($75,149).

On socioeconomic markers, US5 shows a poverty rate of 9.7%; unemployment rate near 6.9%; 13.6% of adults with a bachelor’s degree or higher (about 20.1 points below the national share (33.7%)).

Labor and commute patterns include leading industry context around Agriculture, Construction, and Manufacturing; about 18.1% of workers reporting work-from-home (about 2.9 points above the U.S. share (15.2%)); a mean commute of about 177.0 minutes (U.S. average near 26.8).

Median home value is about $103,800 — about 70% below the U.S. median home value ($348,079).

Housing tenure and rents show owner-occupancy near 93.7% (about 28.3 points above the national owner-occupancy rate (65.4%)).

To comfortably buy a median-priced home in ZIP 57440 in Frankfort, 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 $667. That sits below the local median household income ($61,563), 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 Frankfort city, SD as Very Low (composite score 17.7), which is relatively lower than many U.S. communities. The strongest component scores on US5 are wildfire (66.5) and flood (25.3). 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 Frankfort city, SD show little to no average snow and around 22.8 inches of annual precipitation.

IRS migration statistics show a net inflow of about 29 for ZIP 57440 (Frankfort city, 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.