{
  "zip": "51301",
  "type": "standard",
  "type_source": "inferred",
  "city": "Spencer",
  "other_place_names": [
    "Fostoria"
  ],
  "state": "IA",
  "state_name": "Iowa",
  "county": {
    "fips": "19041",
    "name": "Clay County",
    "short_name": "Clay"
  },
  "counties": [
    {
      "county_fips": "19041",
      "name": "Clay County",
      "short_name": "Clay",
      "weight": 1,
      "basis": "land_area"
    }
  ],
  "location": {
    "lat": 43.153092,
    "lng": -95.149793,
    "source": "gazetteer_internal_point",
    "timezone": "America/Chicago"
  },
  "is_zcta": true,
  "parent_zcta": null,
  "metro": {
    "cbsa_code": "43980",
    "name": "Spencer, IA",
    "type": "micro",
    "csa_code": "517",
    "csa_name": "Spencer-Spirit Lake, IA"
  },
  "demographics": {
    "population": 12638,
    "households": 5680,
    "housing_units": 6185,
    "median_age": 41.8,
    "median_household_income": 63402,
    "median_home_value": 188300,
    "median_rent": 807,
    "pct_bachelors_plus": 29,
    "mean_commute_min": 16.2,
    "density_per_sqmi": 80.2
  },
  "business": {
    "establishments": 483,
    "employees": 6534,
    "annual_payroll_thousands": 304818
  },
  "tax": {
    "irs_returns": 5960,
    "irs_agi_thousands": 474444
  },
  "area": {
    "land_sqmi": 157.659,
    "water_sqmi": 0.87
  },
  "nearest_zips": [
    {
      "zip": "51340",
      "miles": 6,
      "city": "Fostoria",
      "state": "IA"
    },
    {
      "zip": "51333",
      "miles": 7.6,
      "city": "Dickens",
      "state": "IA"
    },
    {
      "zip": "51338",
      "miles": 9.2,
      "city": "Everly",
      "state": "IA"
    },
    {
      "zip": "51357",
      "miles": 9.4,
      "city": "Royal",
      "state": "IA"
    },
    {
      "zip": "51343",
      "miles": 9.4,
      "city": "Greenville",
      "state": "IA"
    },
    {
      "zip": "51341",
      "miles": 10.9,
      "city": "Gillett Grove",
      "state": "IA"
    },
    {
      "zip": "51351",
      "miles": 11.3,
      "city": "Milford",
      "state": "IA"
    },
    {
      "zip": "51358",
      "miles": 13,
      "city": "Ruthven",
      "state": "IA"
    },
    {
      "zip": "51364",
      "miles": 13.8,
      "city": "Terril",
      "state": "IA"
    },
    {
      "zip": "51331",
      "miles": 14.3,
      "city": "Arnolds Park",
      "state": "IA"
    }
  ],
  "release": "2026-10-12",
  "attribution": {
    "source": "zipcodes.pro",
    "url": "https://zipcodes.pro/zip/51301",
    "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."
  }
}