{
  "zip": "59521",
  "type": "standard",
  "type_source": "inferred",
  "city": "Box Elder",
  "other_place_names": [
    "Rocky Boy's Agency",
    "St. Pierre",
    "Parker School",
    "Sangrey",
    "Rocky Boy West",
    "Azure",
    "Boneau"
  ],
  "state": "MT",
  "state_name": "Montana",
  "county": {
    "fips": "30041",
    "name": "Hill County",
    "short_name": "Hill"
  },
  "counties": [
    {
      "county_fips": "30041",
      "name": "Hill County",
      "short_name": "Hill",
      "weight": 0.8164,
      "basis": "land_area"
    },
    {
      "county_fips": "30015",
      "name": "Chouteau County",
      "short_name": "Chouteau",
      "weight": 0.1836,
      "basis": "land_area"
    }
  ],
  "location": {
    "lat": 48.305039,
    "lng": -109.951289,
    "source": "gazetteer_internal_point",
    "timezone": "America/Denver"
  },
  "is_zcta": true,
  "parent_zcta": null,
  "metro": null,
  "demographics": {
    "population": 3529,
    "households": 1001,
    "housing_units": 1123,
    "median_age": 30.2,
    "median_household_income": 50288,
    "median_home_value": 103700,
    "median_rent": 406,
    "pct_bachelors_plus": 18.7,
    "mean_commute_min": 15.4,
    "density_per_sqmi": 12.4
  },
  "business": {
    "establishments": 20,
    "employees": 513,
    "annual_payroll_thousands": 31898
  },
  "tax": {
    "irs_returns": 950,
    "irs_agi_thousands": 50583
  },
  "area": {
    "land_sqmi": 283.631,
    "water_sqmi": 0.306
  },
  "nearest_zips": [
    {
      "zip": "59520",
      "miles": 18.5,
      "city": "Big Sandy",
      "state": "MT"
    },
    {
      "zip": "59532",
      "miles": 20.8,
      "city": "Kremlin",
      "state": "MT"
    },
    {
      "zip": "59525",
      "miles": 27.3,
      "city": "Gildford",
      "state": "MT"
    },
    {
      "zip": "59501",
      "miles": 27.7,
      "city": "Havre",
      "state": "MT"
    },
    {
      "zip": "59460",
      "miles": 30.2,
      "city": "Loma",
      "state": "MT"
    },
    {
      "zip": "59528",
      "miles": 30.9,
      "city": "Hingham",
      "state": "MT"
    },
    {
      "zip": "59540",
      "miles": 34.9,
      "city": "Rudyard",
      "state": "MT"
    },
    {
      "zip": "59523",
      "miles": 37.7,
      "city": "Chinook",
      "state": "MT"
    },
    {
      "zip": "59530",
      "miles": 39.8,
      "city": "Inverness",
      "state": "MT"
    },
    {
      "zip": "59535",
      "miles": 40.9,
      "city": "Lloyd",
      "state": "MT"
    }
  ],
  "release": "2026-10-12",
  "attribution": {
    "source": "zipcodes.pro",
    "url": "https://zipcodes.pro/zip/59521",
    "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."
  }
}