{
  "zip": "57751",
  "type": "standard",
  "type_source": "inferred",
  "city": "Keystone",
  "other_place_names": [],
  "state": "SD",
  "state_name": "South Dakota",
  "county": {
    "fips": "46103",
    "name": "Pennington County",
    "short_name": "Pennington"
  },
  "counties": [
    {
      "county_fips": "46103",
      "name": "Pennington County",
      "short_name": "Pennington",
      "weight": 0.6661,
      "basis": "land_area"
    },
    {
      "county_fips": "46033",
      "name": "Custer County",
      "short_name": "Custer",
      "weight": 0.3339,
      "basis": "land_area"
    }
  ],
  "location": {
    "lat": 43.869135,
    "lng": -103.426932,
    "source": "gazetteer_internal_point",
    "timezone": "America/Denver"
  },
  "is_zcta": true,
  "parent_zcta": null,
  "metro": {
    "cbsa_code": "39660",
    "name": "Rapid City, SD",
    "type": "metro",
    "csa_code": "452",
    "csa_name": "Rapid City-Spearfish, SD"
  },
  "demographics": {
    "population": 893,
    "households": 327,
    "housing_units": 477,
    "median_age": 54.2,
    "median_household_income": 97969,
    "median_home_value": 473500,
    "median_rent": 600,
    "pct_bachelors_plus": 43,
    "mean_commute_min": 34.2,
    "density_per_sqmi": 20.2
  },
  "business": {
    "establishments": 72,
    "employees": 304,
    "annual_payroll_thousands": 18744
  },
  "tax": {
    "irs_returns": 560,
    "irs_agi_thousands": 39727
  },
  "area": {
    "land_sqmi": 44.223,
    "water_sqmi": 0.005
  },
  "nearest_zips": [
    {
      "zip": "57702",
      "miles": 11.3,
      "city": "Rapid City",
      "state": "SD"
    },
    {
      "zip": "57730",
      "miles": 14.8,
      "city": "Custer",
      "state": "SD"
    },
    {
      "zip": "57709",
      "miles": 15.3,
      "city": "Rapid City",
      "state": "SD"
    },
    {
      "zip": "57738",
      "miles": 18.5,
      "city": "Fairburn",
      "state": "SD"
    },
    {
      "zip": "57744",
      "miles": 20.3,
      "city": "Hermosa",
      "state": "SD"
    },
    {
      "zip": "57745",
      "miles": 20.4,
      "city": "Hill City",
      "state": "SD"
    },
    {
      "zip": "57773",
      "miles": 20.7,
      "city": "Pringle",
      "state": "SD"
    },
    {
      "zip": "57701",
      "miles": 20.8,
      "city": "Rapid City",
      "state": "SD"
    },
    {
      "zip": "57718",
      "miles": 21,
      "city": "Black Hawk",
      "state": "SD"
    },
    {
      "zip": "57703",
      "miles": 21.3,
      "city": "Rapid City",
      "state": "SD"
    }
  ],
  "release": "2026-10-12",
  "attribution": {
    "source": "zipcodes.pro",
    "url": "https://zipcodes.pro/zip/57751",
    "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."
  }
}