{
  "zip": "21758",
  "type": "standard",
  "type_source": "inferred",
  "city": "Knoxville",
  "other_place_names": [
    "Garretts Mill",
    "Brunswick",
    "Rosemont",
    "Yarrowsburg",
    "Sandy Hook",
    "Brownsville"
  ],
  "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": 0.5033,
      "basis": "land_area"
    },
    {
      "county_fips": "24043",
      "name": "Washington County",
      "short_name": "Washington",
      "weight": 0.4967,
      "basis": "land_area"
    }
  ],
  "location": {
    "lat": 39.353205,
    "lng": -77.656813,
    "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": 4409,
    "households": 1588,
    "housing_units": 1626,
    "median_age": 39,
    "median_household_income": 111528,
    "median_home_value": 424600,
    "median_rent": 1770,
    "pct_bachelors_plus": 43.7,
    "mean_commute_min": 36.1,
    "density_per_sqmi": 137.7
  },
  "business": {
    "establishments": 59,
    "employees": 402,
    "annual_payroll_thousands": 16270
  },
  "tax": {
    "irs_returns": 2340,
    "irs_agi_thousands": 219170
  },
  "area": {
    "land_sqmi": 32.018,
    "water_sqmi": 2.828
  },
  "nearest_zips": [
    {
      "zip": "21715",
      "miles": 1.8,
      "city": "Brownsville",
      "state": "MD"
    },
    {
      "zip": "21716",
      "miles": 2.9,
      "city": "Brunswick",
      "state": "MD"
    },
    {
      "zip": "21718",
      "miles": 3.2,
      "city": "Burkittsville",
      "state": "MD"
    },
    {
      "zip": "21755",
      "miles": 4.8,
      "city": "Jefferson",
      "state": "MD"
    },
    {
      "zip": "21779",
      "miles": 4.9,
      "city": "Rohrersville",
      "state": "MD"
    },
    {
      "zip": "20180",
      "miles": 5.9,
      "city": "Lovettsville",
      "state": "VA"
    },
    {
      "zip": "25425",
      "miles": 7,
      "city": "Harpers Ferry",
      "state": "WV"
    },
    {
      "zip": "21756",
      "miles": 7.6,
      "city": "Keedysville",
      "state": "MD"
    },
    {
      "zip": "21769",
      "miles": 7.8,
      "city": "Middletown",
      "state": "MD"
    },
    {
      "zip": "25423",
      "miles": 8,
      "city": "Halltown",
      "state": "WV"
    }
  ],
  "release": "2026-10-12",
  "attribution": {
    "source": "zipcodes.pro",
    "url": "https://zipcodes.pro/zip/21758",
    "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."
  }
}