{
  "zip": "21791",
  "type": "standard",
  "type_source": "inferred",
  "city": "Union Bridge",
  "other_place_names": [
    "Libertytown"
  ],
  "state": "MD",
  "state_name": "Maryland",
  "county": {
    "fips": "24021",
    "name": "Frederick County",
    "short_name": "Frederick"
  },
  "counties": [
    {
      "county_fips": "24021",
      "name": "Frederick County",
      "short_name": "Frederick",
      "weight": 0.6067,
      "basis": "land_area"
    },
    {
      "county_fips": "24013",
      "name": "Carroll County",
      "short_name": "Carroll",
      "weight": 0.3933,
      "basis": "land_area"
    }
  ],
  "location": {
    "lat": 39.533053,
    "lng": -77.18856,
    "source": "gazetteer_internal_point",
    "timezone": "America/New_York"
  },
  "is_zcta": true,
  "parent_zcta": null,
  "metro": {
    "cbsa_code": "47900",
    "name": "Washington-Arlington-Alexandria, DC-VA-MD-WV",
    "type": "metro",
    "csa_code": "548",
    "csa_name": "Washington-Baltimore-Arlington, DC-MD-VA-WV-PA"
  },
  "demographics": {
    "population": 5340,
    "households": 1968,
    "housing_units": 2059,
    "median_age": 37.7,
    "median_household_income": 93015,
    "median_home_value": 379800,
    "median_rent": 1457,
    "pct_bachelors_plus": 26.7,
    "mean_commute_min": 37.3,
    "density_per_sqmi": 116
  },
  "business": {
    "establishments": 98,
    "employees": 868,
    "annual_payroll_thousands": 40869
  },
  "tax": {
    "irs_returns": 2560,
    "irs_agi_thousands": 218414
  },
  "area": {
    "land_sqmi": 46.04,
    "water_sqmi": 0.08
  },
  "nearest_zips": [
    {
      "zip": "21792",
      "miles": 4,
      "city": "Unionville",
      "state": "MD"
    },
    {
      "zip": "21762",
      "miles": 4.8,
      "city": "Libertytown",
      "state": "MD"
    },
    {
      "zip": "21776",
      "miles": 4.8,
      "city": "New Windsor",
      "state": "MD"
    },
    {
      "zip": "21757",
      "miles": 5.6,
      "city": "Keymar",
      "state": "MD"
    },
    {
      "zip": "21798",
      "miles": 5.7,
      "city": "Woodsboro",
      "state": "MD"
    },
    {
      "zip": "21759",
      "miles": 6,
      "city": "Ladiesburg",
      "state": "MD"
    },
    {
      "zip": "21775",
      "miles": 6.1,
      "city": "New Midway",
      "state": "MD"
    },
    {
      "zip": "21793",
      "miles": 8.8,
      "city": "Walkersville",
      "state": "MD"
    },
    {
      "zip": "21778",
      "miles": 9.4,
      "city": "Rocky Ridge",
      "state": "MD"
    },
    {
      "zip": "21774",
      "miles": 9.6,
      "city": "New Market",
      "state": "MD"
    }
  ],
  "release": "2026-10-12",
  "attribution": {
    "source": "zipcodes.pro",
    "url": "https://zipcodes.pro/zip/21791",
    "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."
  }
}