{
  "zip": "51591",
  "type": "unknown",
  "type_source": "inferred",
  "city": "Red Oak",
  "other_place_names": [],
  "state": "IA",
  "state_name": "Iowa",
  "county": {
    "fips": "19137",
    "name": "Montgomery County",
    "short_name": "Montgomery"
  },
  "counties": [],
  "location": {
    "lat": 41.0303,
    "lng": -95.1562,
    "source": "geonames",
    "timezone": "America/Chicago"
  },
  "is_zcta": false,
  "parent_zcta": "51566",
  "metro": null,
  "demographics": {
    "population": null,
    "households": null,
    "housing_units": null,
    "median_age": null,
    "median_household_income": null,
    "median_home_value": null,
    "median_rent": null,
    "pct_bachelors_plus": null,
    "mean_commute_min": null,
    "density_per_sqmi": null
  },
  "business": {
    "establishments": null,
    "employees": null,
    "annual_payroll_thousands": null
  },
  "tax": {
    "irs_returns": null,
    "irs_agi_thousands": null
  },
  "area": {
    "land_sqmi": null,
    "water_sqmi": null
  },
  "nearest_zips": [
    {
      "zip": "51566",
      "miles": 4,
      "city": "Red Oak",
      "state": "IA"
    },
    {
      "zip": "51573",
      "miles": 4.8,
      "city": "Stanton",
      "state": "IA"
    },
    {
      "zip": "51532",
      "miles": 7.8,
      "city": "Elliott",
      "state": "IA"
    },
    {
      "zip": "50864",
      "miles": 10.2,
      "city": "Villisca",
      "state": "IA"
    },
    {
      "zip": "51533",
      "miles": 11.6,
      "city": "Emerson",
      "state": "IA"
    },
    {
      "zip": "50847",
      "miles": 11.8,
      "city": "Grant",
      "state": "IA"
    },
    {
      "zip": "51535",
      "miles": 13.6,
      "city": "Griswold",
      "state": "IA"
    },
    {
      "zip": "51638",
      "miles": 14.5,
      "city": "Essex",
      "state": "IA"
    },
    {
      "zip": "51541",
      "miles": 15.5,
      "city": "Henderson",
      "state": "IA"
    },
    {
      "zip": "50857",
      "miles": 15.9,
      "city": "Nodaway",
      "state": "IA"
    }
  ],
  "release": "2026-10-12",
  "attribution": {
    "source": "zipcodes.pro",
    "url": "https://zipcodes.pro/zip/51591",
    "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."
  }
}