{
  "zip": "51040",
  "type": "standard",
  "type_source": "inferred",
  "city": "Onawa",
  "other_place_names": [
    "Turin"
  ],
  "state": "IA",
  "state_name": "Iowa",
  "county": {
    "fips": "19133",
    "name": "Monona County",
    "short_name": "Monona"
  },
  "counties": [
    {
      "county_fips": "19133",
      "name": "Monona County",
      "short_name": "Monona",
      "weight": 1,
      "basis": "land_area"
    }
  ],
  "location": {
    "lat": 42.03254,
    "lng": -96.068714,
    "source": "gazetteer_internal_point",
    "timezone": "America/Chicago"
  },
  "is_zcta": true,
  "parent_zcta": null,
  "metro": null,
  "demographics": {
    "population": 3500,
    "households": 1555,
    "housing_units": 1731,
    "median_age": 37.6,
    "median_household_income": 71179,
    "median_home_value": 151600,
    "median_rent": 947,
    "pct_bachelors_plus": 19.9,
    "mean_commute_min": 18.3,
    "density_per_sqmi": 27
  },
  "business": {
    "establishments": 115,
    "employees": 1156,
    "annual_payroll_thousands": 50687
  },
  "tax": {
    "irs_returns": 1500,
    "irs_agi_thousands": 105679
  },
  "area": {
    "land_sqmi": 129.511,
    "water_sqmi": 1.614
  },
  "nearest_zips": [
    {
      "zip": "51010",
      "miles": 8.1,
      "city": "Castana",
      "state": "IA"
    },
    {
      "zip": "51523",
      "miles": 8.1,
      "city": "Blencoe",
      "state": "IA"
    },
    {
      "zip": "51063",
      "miles": 9.3,
      "city": "Whiting",
      "state": "IA"
    },
    {
      "zip": "68020",
      "miles": 10.9,
      "city": "Decatur",
      "state": "NE"
    },
    {
      "zip": "51558",
      "miles": 12.6,
      "city": "Moorhead",
      "state": "IA"
    },
    {
      "zip": "51545",
      "miles": 12.8,
      "city": "Little Sioux",
      "state": "IA"
    },
    {
      "zip": "51051",
      "miles": 13.1,
      "city": "Rodney",
      "state": "IA"
    },
    {
      "zip": "51572",
      "miles": 13.8,
      "city": "Soldier",
      "state": "IA"
    },
    {
      "zip": "68039",
      "miles": 15,
      "city": "Macy",
      "state": "NE"
    },
    {
      "zip": "51026",
      "miles": 15.4,
      "city": "Hornick",
      "state": "IA"
    }
  ],
  "release": "2026-10-12",
  "attribution": {
    "source": "zipcodes.pro",
    "url": "https://zipcodes.pro/zip/51040",
    "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."
  }
}