{
  "zip": "21231",
  "type": "standard",
  "type_source": "inferred",
  "city": "Baltimore",
  "other_place_names": [],
  "state": "MD",
  "state_name": "Maryland",
  "county": {
    "fips": "24510",
    "name": "Baltimore city",
    "short_name": "Baltimore city"
  },
  "counties": [
    {
      "county_fips": "24510",
      "name": "Baltimore city",
      "short_name": "Baltimore city",
      "weight": 1,
      "basis": "land_area"
    }
  ],
  "location": {
    "lat": 39.288507,
    "lng": -76.592024,
    "source": "gazetteer_internal_point",
    "timezone": "America/New_York"
  },
  "is_zcta": true,
  "parent_zcta": null,
  "metro": {
    "cbsa_code": "12580",
    "name": "Baltimore-Columbia-Towson, MD",
    "type": "metro",
    "csa_code": "548",
    "csa_name": "Washington-Baltimore-Arlington, DC-MD-VA-WV-PA"
  },
  "demographics": {
    "population": 14969,
    "households": 8136,
    "housing_units": 9514,
    "median_age": 32.7,
    "median_household_income": 85254,
    "median_home_value": 350100,
    "median_rent": 1796,
    "pct_bachelors_plus": 64.3,
    "mean_commute_min": 24.1,
    "density_per_sqmi": 17265.3
  },
  "business": {
    "establishments": 509,
    "employees": 9784,
    "annual_payroll_thousands": 981825
  },
  "tax": {
    "irs_returns": 8200,
    "irs_agi_thousands": 830214
  },
  "area": {
    "land_sqmi": 0.867,
    "water_sqmi": 0.077
  },
  "nearest_zips": [
    {
      "zip": "21233",
      "miles": 0.7,
      "city": "Baltimore",
      "state": "MD"
    },
    {
      "zip": "21287",
      "miles": 0.8,
      "city": "Baltimore",
      "state": "MD"
    },
    {
      "zip": "21202",
      "miles": 1,
      "city": "Baltimore",
      "state": "MD"
    },
    {
      "zip": "21203",
      "miles": 1.5,
      "city": "Baltimore",
      "state": "MD"
    },
    {
      "zip": "21235",
      "miles": 1.5,
      "city": "Baltimore",
      "state": "MD"
    },
    {
      "zip": "21241",
      "miles": 1.5,
      "city": "Baltimore",
      "state": "MD"
    },
    {
      "zip": "21263",
      "miles": 1.5,
      "city": "Baltimore",
      "state": "MD"
    },
    {
      "zip": "21264",
      "miles": 1.5,
      "city": "Baltimore",
      "state": "MD"
    },
    {
      "zip": "21270",
      "miles": 1.5,
      "city": "Baltimore",
      "state": "MD"
    },
    {
      "zip": "21273",
      "miles": 1.5,
      "city": "Baltimore",
      "state": "MD"
    }
  ],
  "release": "2026-10-12",
  "attribution": {
    "source": "zipcodes.pro",
    "url": "https://zipcodes.pro/zip/21231",
    "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."
  }
}