{
  "zip": "57239",
  "type": "standard",
  "type_source": "inferred",
  "city": "Grenville",
  "other_place_names": [],
  "state": "SD",
  "state_name": "South Dakota",
  "county": {
    "fips": "46037",
    "name": "Day County",
    "short_name": "Day"
  },
  "counties": [
    {
      "county_fips": "46037",
      "name": "Day County",
      "short_name": "Day",
      "weight": 1,
      "basis": "land_area"
    }
  ],
  "location": {
    "lat": 45.510884,
    "lng": -97.31312,
    "source": "gazetteer_internal_point",
    "timezone": "America/Chicago"
  },
  "is_zcta": true,
  "parent_zcta": null,
  "metro": null,
  "demographics": {
    "population": 358,
    "households": 186,
    "housing_units": 475,
    "median_age": 63.2,
    "median_household_income": 106389,
    "median_home_value": 377300,
    "median_rent": null,
    "pct_bachelors_plus": 34.9,
    "mean_commute_min": 32.3,
    "density_per_sqmi": 8
  },
  "business": {
    "establishments": 9,
    "employees": 37,
    "annual_payroll_thousands": 1191
  },
  "tax": {
    "irs_returns": 110,
    "irs_agi_thousands": 12069
  },
  "area": {
    "land_sqmi": 44.828,
    "water_sqmi": 2.488
  },
  "nearest_zips": [
    {
      "zip": "57232",
      "miles": 8.8,
      "city": "Eden",
      "state": "SD"
    },
    {
      "zip": "57261",
      "miles": 9.3,
      "city": "Roslyn",
      "state": "SD"
    },
    {
      "zip": "57273",
      "miles": 12.4,
      "city": "Waubay",
      "state": "SD"
    },
    {
      "zip": "57257",
      "miles": 13.7,
      "city": "Peever",
      "state": "SD"
    },
    {
      "zip": "57247",
      "miles": 15.7,
      "city": "Lake City",
      "state": "SD"
    },
    {
      "zip": "57262",
      "miles": 15.9,
      "city": "Sisseton",
      "state": "SD"
    },
    {
      "zip": "57274",
      "miles": 18.2,
      "city": "Webster",
      "state": "SD"
    },
    {
      "zip": "57266",
      "miles": 18.6,
      "city": "Summit",
      "state": "SD"
    },
    {
      "zip": "57256",
      "miles": 18.9,
      "city": "Ortley",
      "state": "SD"
    },
    {
      "zip": "57468",
      "miles": 20.9,
      "city": "Pierpont",
      "state": "SD"
    }
  ],
  "release": "2026-10-12",
  "attribution": {
    "source": "zipcodes.pro",
    "url": "https://zipcodes.pro/zip/57239",
    "sources_url": "https://zipcodes.pro/sources",
    "license": "Facts derived from US public-domain data (Census, IRS) and GeoNames (CC BY 4.0). Attribution appreciated: zipcodes.pro",
    "note": "A null value means the source did not publish that figure for this ZIP code. It does not mean zero."
  }
}