{
  "zip": "01821",
  "type": "standard",
  "type_source": "inferred",
  "city": "Billerica",
  "other_place_names": [
    "Pinehurst"
  ],
  "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": 42.54933,
    "lng": -71.251725,
    "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": 30143,
    "households": 11312,
    "housing_units": 11430,
    "median_age": 44.3,
    "median_household_income": 149042,
    "median_home_value": 615100,
    "median_rent": 2346,
    "pct_bachelors_plus": 40.2,
    "mean_commute_min": 25.9,
    "density_per_sqmi": 1816.7
  },
  "business": {
    "establishments": 717,
    "employees": 15332,
    "annual_payroll_thousands": 1548721
  },
  "tax": {
    "irs_returns": 16920,
    "irs_agi_thousands": 1663097
  },
  "area": {
    "land_sqmi": 16.592,
    "water_sqmi": 0.403
  },
  "nearest_zips": [
    {
      "zip": "01822",
      "miles": 1.1,
      "city": "Billerica",
      "state": "MA"
    },
    {
      "zip": "01865",
      "miles": 1.2,
      "city": "Nutting Lake",
      "state": "MA"
    },
    {
      "zip": "01866",
      "miles": 1.8,
      "city": "Pinehurst",
      "state": "MA"
    },
    {
      "zip": "01862",
      "miles": 3,
      "city": "North Billerica",
      "state": "MA"
    },
    {
      "zip": "01730",
      "miles": 3.8,
      "city": "Bedford",
      "state": "MA"
    },
    {
      "zip": "01803",
      "miles": 4.1,
      "city": "Burlington",
      "state": "MA"
    },
    {
      "zip": "01805",
      "miles": 4.2,
      "city": "Burlington",
      "state": "MA"
    },
    {
      "zip": "01876",
      "miles": 4.5,
      "city": "Tewksbury",
      "state": "MA"
    },
    {
      "zip": "01887",
      "miles": 4.6,
      "city": "Wilmington",
      "state": "MA"
    },
    {
      "zip": "01741",
      "miles": 5.6,
      "city": "Carlisle",
      "state": "MA"
    }
  ],
  "release": "2026-10-12",
  "attribution": {
    "source": "zipcodes.pro",
    "url": "https://zipcodes.pro/zip/01821",
    "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."
  }
}