Polish Cities (source: https://stat.gov.pl/obszary-tematyczne/ludnosc/ludnosc/powierzchnia-i-ludnosc-w-przekroju-terytorialnym-w-2018-roku,7,15.html)

polish_cities.json

[
  {
    "city": "Wrocław",
    "voivodeship": "dolnośląskie",
    "population": "638586",
    "area": "293"
  },
  {
    "city": "Bydgoszcz",
    "voivodeship": "kujawsko-pomorskie",
    "population": "352313",
    "area": "176"
  },
  {
    "city": "Toruń",
    "voivodeship": "kujawsko-pomorskie",
    "population": "202562",
    "area": "116"
  },
  {
    "city": "Lublin",
    "voivodeship": "lubelskie",
    "population": "339850",
    "area": "147"
  },
  {
    "city": "Gorzów Wielkopolski",
    "voivodeship": "lubuskie",
    "population": "124295",
    "area": "86"
  },
  {
    "city": "Zielona Góra",
    "voivodeship": "lubuskie",
    "population": "139819",
    "area": "277"
  },
  {
    "city": "Łódź",
    "voivodeship": "łódzkie",
    "population": "690422",
    "area": "293"
  },
  {
    "city": "Kraków",
    "voivodeship": "małopolskie",
    "population": "767348",
    "area": "327"
  },
  {
    "city": "Warszawa",
    "voivodeship": "mazowieckie",
    "population": "1764615",
    "area": "517"
  },
  {
    "city": "Opole",
    "voivodeship": "opolskie",
    "population": "128140",
    "area": "149"
  },
  {
    "city": "Rzeszów",
    "voivodeship": "podkarpackie",
    "population": "189662",
    "area": "120"
  },
  {
    "city": "Białystok",
    "voivodeship": "podlaskie",
    "population": "297288",
    "area": "102"
  },
  {
    "city": "Gdańsk",
    "voivodeship": "pomorskie",
    "population": "464254",
    "area": "262"
  },
  {
    "city": "Katowice",
    "voivodeship": "śląskie",
    "population": "296262",
    "area": "165"
  },
  {
    "city": "Kielce",
    "voivodeship": "świętokrzyskie",
    "population": "196804",
    "area": "110"
  },
  {
    "city": "Olsztyn",
    "voivodeship": "warminsko-mazurskie",
    "population": "173070",
    "area": "88"
  },
  {
    "city": "Poznań",
    "voivodeship": "wielkopolskie",
    "population": "538633",
    "area": "262"
  },
  {
    "city": "Szczecin",
    "voivodeship": "zachodniopomorskie",
    "population": "403883",
    "area": "301"
  }
]