{
  "zip": "51640",
  "type": "standard",
  "type_source": "inferred",
  "city": "Hamburg",
  "other_place_names": [],
  "state": "IA",
  "state_name": "Iowa",
  "county": {
    "fips": "19071",
    "name": "Fremont County",
    "short_name": "Fremont"
  },
  "counties": [
    {
      "county_fips": "19071",
      "name": "Fremont County",
      "short_name": "Fremont",
      "weight": 0.8194,
      "basis": "land_area"
    },
    {
      "county_fips": "29005",
      "name": "Atchison County",
      "short_name": "Atchison",
      "weight": 0.1806,
      "basis": "land_area"
    }
  ],
  "location": {
    "lat": 40.626185,
    "lng": -95.661417,
    "source": "gazetteer_internal_point",
    "timezone": "America/Chicago"
  },
  "is_zcta": true,
  "parent_zcta": null,
  "metro": null,
  "demographics": {
    "population": 1381,
    "households": 588,
    "housing_units": 690,
    "median_age": 43.1,
    "median_household_income": 65385,
    "median_home_value": 122900,
    "median_rent": 729,
    "pct_bachelors_plus": 18.4,
    "mean_commute_min": 23,
    "density_per_sqmi": 12
  },
  "business": {
    "establishments": 31,
    "employees": 415,
    "annual_payroll_thousands": 27873
  },
  "tax": {
    "irs_returns": 590,
    "irs_agi_thousands": 44260
  },
  "area": {
    "land_sqmi": 115.411,
    "water_sqmi": 1.557
  },
  "nearest_zips": [
    {
      "zip": "51650",
      "miles": 6.9,
      "city": "Riverton",
      "state": "IA"
    },
    {
      "zip": "64496",
      "miles": 9.1,
      "city": "Watson",
      "state": "MO"
    },
    {
      "zip": "68421",
      "miles": 10.1,
      "city": "Peru",
      "state": "NE"
    },
    {
      "zip": "51652",
      "miles": 10.3,
      "city": "Sidney",
      "state": "IA"
    },
    {
      "zip": "51648",
      "miles": 10.7,
      "city": "Percival",
      "state": "IA"
    },
    {
      "zip": "68410",
      "miles": 11.7,
      "city": "Nebraska City",
      "state": "NE"
    },
    {
      "zip": "51639",
      "miles": 12.1,
      "city": "Farragut",
      "state": "IA"
    },
    {
      "zip": "68379",
      "miles": 12.8,
      "city": "Julian",
      "state": "NE"
    },
    {
      "zip": "64482",
      "miles": 13.5,
      "city": "Rock Port",
      "state": "MO"
    },
    {
      "zip": "68321",
      "miles": 15.7,
      "city": "Brownville",
      "state": "NE"
    }
  ],
  "release": "2026-10-12",
  "attribution": {
    "source": "zipcodes.pro",
    "url": "https://zipcodes.pro/zip/51640",
    "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."
  }
}