{
  "zip": "01721",
  "type": "standard",
  "type_source": "inferred",
  "city": "Ashland",
  "other_place_names": [],
  "state": "MA",
  "state_name": "Massachusetts",
  "county": {
    "fips": "25017",
    "name": "Middlesex County",
    "short_name": "Middlesex"
  },
  "counties": [
    {
      "county_fips": "25017",
      "name": "Middlesex County",
      "short_name": "Middlesex",
      "weight": 1,
      "basis": "land_area"
    }
  ],
  "location": {
    "lat": 42.257755,
    "lng": -71.473526,
    "source": "gazetteer_internal_point",
    "timezone": "America/New_York"
  },
  "is_zcta": true,
  "parent_zcta": null,
  "metro": {
    "cbsa_code": "14460",
    "name": "Boston-Cambridge-Newton, MA-NH",
    "type": "metro",
    "csa_code": "148",
    "csa_name": "Boston-Worcester-Providence, MA-RI-NH"
  },
  "demographics": {
    "population": 18873,
    "households": 7643,
    "housing_units": 8094,
    "median_age": 42.1,
    "median_household_income": 127539,
    "median_home_value": 611700,
    "median_rent": 2452,
    "pct_bachelors_plus": 60.7,
    "mean_commute_min": 36.8,
    "density_per_sqmi": 1529.7
  },
  "business": {
    "establishments": 438,
    "employees": 4438,
    "annual_payroll_thousands": 249566
  },
  "tax": {
    "irs_returns": 9500,
    "irs_agi_thousands": 1274639
  },
  "area": {
    "land_sqmi": 12.338,
    "water_sqmi": 0.537
  },
  "nearest_zips": [
    {
      "zip": "01702",
      "miles": 2.5,
      "city": "Framingham",
      "state": "MA"
    },
    {
      "zip": "01745",
      "miles": 2.7,
      "city": "Fayville",
      "state": "MA"
    },
    {
      "zip": "01748",
      "miles": 4.1,
      "city": "Hopkinton",
      "state": "MA"
    },
    {
      "zip": "01772",
      "miles": 4.3,
      "city": "Southborough",
      "state": "MA"
    },
    {
      "zip": "01746",
      "miles": 4.4,
      "city": "Holliston",
      "state": "MA"
    },
    {
      "zip": "01701",
      "miles": 4.6,
      "city": "Framingham",
      "state": "MA"
    },
    {
      "zip": "01784",
      "miles": 4.7,
      "city": "Woodville",
      "state": "MA"
    },
    {
      "zip": "01770",
      "miles": 5.4,
      "city": "Sherborn",
      "state": "MA"
    },
    {
      "zip": "01760",
      "miles": 6.6,
      "city": "Natick",
      "state": "MA"
    },
    {
      "zip": "01581",
      "miles": 7.2,
      "city": "Westborough",
      "state": "MA"
    }
  ],
  "release": "2026-10-12",
  "attribution": {
    "source": "zipcodes.pro",
    "url": "https://zipcodes.pro/zip/01721",
    "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."
  }
}