diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0732e8c..db68ca7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,7 @@
 
 ### New features
 
+* [#23](https://github.com/sarslanoglu/turkish_cities/pull/23): Add region data to cities.yaml and update ```list_cities``` method to support regions
 * [#21](https://github.com/sarslanoglu/turkish_cities/pull/21): Add city finding with phone code and vice versa. ```find_name_by_phone_code``` and ```find_phone_code_by_name``` methods are added
 
 ### Bug fixes
diff --git a/lib/turkish_cities/city.rb b/lib/turkish_cities/city.rb
index 0c7d8ab..526f916 100644
--- a/lib/turkish_cities/city.rb
+++ b/lib/turkish_cities/city.rb
@@ -33,7 +33,7 @@ def find_by_phone_code(phone_code)
 
   def find_by_name(city_name, return_type)
     CITY_LIST.each do |city|
-      if convert_chars(city['name'].downcase(:turkic)) == convert_chars(city_name.downcase(:turkic))
+      if convert_chars(city['name']) == convert_chars(city_name)
         return return_type == 'plate_number' ? city['plate_number'] : city['phone_code']
       end
     end
@@ -41,16 +41,12 @@ def find_by_name(city_name, return_type)
   end
 
   def list_cities(options)
-    if options[:metropolitan_municipality]
-      city_list = CITY_LIST.map do |city|
-        city unless city['metropolitan_municipality_since'].nil?
-      end
-      city_list
-    else
-      city_list = CITY_LIST
-    end
+    city_list = CITY_LIST
 
-    final_city_list = prepare_city_list(city_list.compact)
+    city_list = filter_metropolitan_municipalities(city_list) if options[:metropolitan_municipality]
+    city_list = filter_regions(city_list, options[:region]) if options[:region]
+
+    final_city_list = prepare_city_list(city_list)
     options[:alphabetically_sorted] ? sort_cities(final_city_list) : final_city_list
   end
 
@@ -69,7 +65,16 @@ def check_phone_code(input)
   end
 
   def convert_chars(string)
-    I18n.transliterate(string)
+    I18n.transliterate(string.downcase(:turkic))
+  end
+
+  def filter_metropolitan_municipalities(city_list)
+    city_list.map { |city| city unless city['metropolitan_municipality_since'].nil? }.compact
+  end
+
+  def filter_regions(city_list, region)
+    region = convert_chars(region.to_s)
+    city_list.map { |city| city if convert_chars(city['region']) == region }.compact
   end
 
   def prepare_city_list(city_list)
diff --git a/lib/turkish_cities/data/cities.yaml b/lib/turkish_cities/data/cities.yaml
index d4b4bca..d5e7b4d 100644
--- a/lib/turkish_cities/data/cities.yaml
+++ b/lib/turkish_cities/data/cities.yaml
@@ -3,403 +3,484 @@
   name: 'Adana'
   phone_code: 322
   metropolitan_municipality_since: 1986
+  region: 'Akdeniz'
 -
   plate_number: 2
   name: 'Adıyaman'
   phone_code: 416
   metropolitan_municipality_since: null
+  region: 'Güneydoğu Anadolu'
 -
   plate_number: 3
   name: 'Afyon'
   phone_code: 272
   metropolitan_municipality_since: null
+  region: 'Ege'
 -
   plate_number: 4
   name: 'Ağrı'
   phone_code: 472
   metropolitan_municipality_since: null
+  region: 'Doğu Anadolu'
 -
   plate_number: 5
   name: 'Amasya'
   phone_code: 358
   metropolitan_municipality_since: null
+  region: 'Karadeniz'
 -
   plate_number: 6
   name: 'Ankara'
   phone_code: 312
   metropolitan_municipality_since: 1984
+  region: 'İç Anadolu'
 -
   plate_number: 7
   name: 'Antalya'
   phone_code: 242
   metropolitan_municipality_since: 1993
+  region: 'Akdeniz'
 -
   plate_number: 8
   name: 'Artvin'
   phone_code: 466
   metropolitan_municipality_since: null
+  region: 'Karadeniz'
 -
   plate_number: 9
   name: 'Aydın'
   phone_code: 256
   metropolitan_municipality_since: 2012
+  region: 'Ege'
 -
   plate_number: 10
   name: 'Balıkesir'
   phone_code: 266
   metropolitan_municipality_since: 2012
+  region: 'Marmara'
 -
   plate_number: 11
   name: 'Bilecik'
   phone_code: 228
   metropolitan_municipality_since: null
+  region: 'Marmara'
 -
   plate_number: 12
   name: 'Bingöl'
   phone_code: 426
   metropolitan_municipality_since: null
+  region: 'Doğu Anadolu'
 -
   plate_number: 13
   name: 'Bitlis'
   phone_code: 434
   metropolitan_municipality_since: null
+  region: 'Doğu Anadolu'
 -
   plate_number: 14
   name: 'Bolu'
   phone_code: 374
   metropolitan_municipality_since: null
+  region: 'Karadeniz'
 -
   plate_number: 15
   name: 'Burdur'
   phone_code: 248
   metropolitan_municipality_since: null
+  region: 'Akdeniz'
 -
   plate_number: 16
   name: 'Bursa'
   phone_code: 224
   metropolitan_municipality_since: 1987
+  region: 'Marmara'
 -
   plate_number: 17
   name: 'Çanakkale'
   phone_code: 286
   metropolitan_municipality_since: null
+  region: 'Marmara'
 -
   plate_number: 18
   name: 'Çankırı'
   phone_code: 376
   metropolitan_municipality_since: null
+  region: 'İç Anadolu'
 -
   plate_number: 19
   name: 'Çorum'
   phone_code: 364
   metropolitan_municipality_since: null
+  region: 'Karadeniz'
 -
   plate_number: 20
   name: 'Denizli'
   phone_code: 258
   metropolitan_municipality_since: 2012
+  region: 'Ege'
 -
   plate_number: 21
   name: 'Diyarbakır'
   phone_code: 412
   metropolitan_municipality_since: 1993
+  region: 'Güneydoğu Anadolu'
 -
   plate_number: 22
   name: 'Edirne'
   phone_code: 284
   metropolitan_municipality_since: null
+  region: 'Marmara'
 -
   plate_number: 23
   name: 'Elazığ'
   phone_code: 424
   metropolitan_municipality_since: null
+  region: 'Doğu Anadolu'
 -
   plate_number: 24
   name: 'Erzincan'
   phone_code: 446
   metropolitan_municipality_since: null
+  region: 'Doğu Anadolu'
 -
   plate_number: 25
   name: 'Erzurum'
   phone_code: 442
   metropolitan_municipality_since: 1993
+  region: 'Doğu Anadolu'
 -
   plate_number: 26
   name: 'Eskişehir'
   phone_code: 222
   metropolitan_municipality_since: 1993
+  region: 'İç Anadolu'
 -
   plate_number: 27
   name: 'Gaziantep'
   phone_code: 342
   metropolitan_municipality_since: 1987
+  region: 'Güneydoğu Anadolu'
 -
   plate_number: 28
   name: 'Giresun'
   phone_code: 454
   metropolitan_municipality_since: null
+  region: 'Karadeniz'
 -
   plate_number: 29
   name: 'Gümüşhane'
   phone_code: 456
   metropolitan_municipality_since: null
+  region: 'Karadeniz'
 -
   plate_number: 30
   name: 'Hakkari'
   phone_code: 438
   metropolitan_municipality_since: null
+  region: 'Doğu Anadolu'
 -
   plate_number: 31
   name: 'Hatay'
   phone_code: 326
   metropolitan_municipality_since: 2012
+  region: 'Akdeniz'
 -
   plate_number: 32
   name: 'Isparta'
   phone_code: 246
   metropolitan_municipality_since: null
+  region: 'Akdeniz'
 -
   plate_number: 33
   name: 'Mersin'
   phone_code: 324
   metropolitan_municipality_since: 1993
+  region: 'Akdeniz'
 -
   plate_number: 34
   name: 'İstanbul'
   phone_code: [212,216]
   metropolitan_municipality_since: 1984
+  region: 'Marmara'
 -
   plate_number: 35
   name: 'İzmir'
   phone_code: 232
   metropolitan_municipality_since: 1984
+  region: 'Ege'
 -
   plate_number: 36
   name: 'Kars'
   phone_code: 474
   metropolitan_municipality_since: null
+  region: 'Doğu Anadolu'
 -
   plate_number: 37
   name: 'Kastamonu'
   phone_code: 366
   metropolitan_municipality_since: null
+  region: 'Karadeniz'
 -
   plate_number: 38
   name: 'Kayseri'
   phone_code: 352
   metropolitan_municipality_since: 1988
+  region: 'İç Anadolu'
 -
   plate_number: 39
   name: 'Kırklareli'
   phone_code: 288
   metropolitan_municipality_since: null
+  region: 'Marmara'
 -
   plate_number: 40
   name: 'Kırşehir'
   phone_code: 386
   metropolitan_municipality_since: null
+  region: 'İç Anadolu'
 -
   plate_number: 41
   name: 'Kocaeli'
   phone_code: 262
   metropolitan_municipality_since: 1993
+  region: 'Marmara'
 -
   plate_number: 42
   name: 'Konya'
   phone_code: 332
   metropolitan_municipality_since: 1987
+  region: 'İç Anadolu'
 -
   plate_number: 43
   name: 'Kütahya'
   phone_code: 274
   metropolitan_municipality_since: null
+  region: 'Ege'
 -
   plate_number: 44
   name: 'Malatya'
   phone_code: 422
   metropolitan_municipality_since: 2012
+  region: 'Doğu Anadolu'
 -
   plate_number: 45
   name: 'Manisa'
   phone_code: 236
   metropolitan_municipality_since: 2012
+  region: 'Ege'
 -
   plate_number: 46
   name: 'Kahramanmaraş'
   phone_code: 344
   metropolitan_municipality_since: 2012
+  region: 'Akdeniz'
 -
   plate_number: 47
   name: 'Mardin'
   phone_code: 482
   metropolitan_municipality_since: 2012
+  region: 'Güneydoğu Anadolu'
 -
   plate_number: 48
   name: 'Muğla'
   phone_code: 252
   metropolitan_municipality_since: 2012
+  region: 'Ege'
 -
   plate_number: 49
   name: 'Muş'
   phone_code: 436
   metropolitan_municipality_since: null
+  region: 'Doğu Anadolu'
 -
   plate_number: 50
   name: 'Nevşehir'
   phone_code: 384
   metropolitan_municipality_since: null
+  region: 'İç Anadolu'
 -
   plate_number: 51
   name: 'Niğde'
   phone_code: 388
   metropolitan_municipality_since: null
+  region: 'İç Anadolu'
 -
   plate_number: 52
   name: 'Ordu'
   phone_code: 452
   metropolitan_municipality_since: 2012
+  region: 'Karadeniz'
 -
   plate_number: 53
   name: 'Rize'
   phone_code: 464
   metropolitan_municipality_since: null
+  region: 'Karadeniz'
 -
   plate_number: 54
   name: 'Sakarya'
   phone_code: 264
   metropolitan_municipality_since: 2000
+  region: 'Marmara'
 -
   plate_number: 55
   name: 'Samsun'
   phone_code: 362
   metropolitan_municipality_since: 1993
+  region: 'Karadeniz'
 -
   plate_number: 56
   name: 'Siirt'
   phone_code: 484
   metropolitan_municipality_since: null
+  region: 'Güneydoğu Anadolu'
 -
   plate_number: 57
   name: 'Sinop'
   phone_code: 368
   metropolitan_municipality_since: null
+  region: 'Karadeniz'
 -
   plate_number: 58
   name: 'Sivas'
   phone_code: 346
   metropolitan_municipality_since: null
+  region: 'İç Anadolu'
 -
   plate_number: 59
   name: 'Tekirdağ'
   phone_code: 282
   metropolitan_municipality_since: 2012
+  region: 'Marmara'
 -
   plate_number: 60
   name: 'Tokat'
   phone_code: 356
   metropolitan_municipality_since: null
+  region: 'Karadeniz'
 -
   plate_number: 61
   name: 'Trabzon'
   phone_code: 462
   metropolitan_municipality_since: 2012
+  region: 'Karadeniz'
 -
   plate_number: 62
   name: 'Tunceli'
   phone_code: 428
   metropolitan_municipality_since: null
+  region: 'Doğu Anadolu'
 -
   plate_number: 63
   name: 'Şanlıurfa'
   phone_code: 414
   metropolitan_municipality_since: 2012
+  region: 'Güneydoğu Anadolu'
 -
   plate_number: 64
   name: 'Uşak'
   phone_code: 276
   metropolitan_municipality_since: null
+  region: 'Ege'
 -
   plate_number: 65
   name: 'Van'
   phone_code: 432
   metropolitan_municipality_since: 2012
+  region: 'Doğu Anadolu'
 -
   plate_number: 66
   name: 'Yozgat'
   phone_code: 354
   metropolitan_municipality_since: null
+  region: 'İç Anadolu'
 -
   plate_number: 67
   name: 'Zonguldak'
   phone_code: 372
   metropolitan_municipality_since: null
+  region: 'Karadeniz'
 -
   plate_number: 68
   name: 'Aksaray'
   phone_code: 382
   metropolitan_municipality_since: null
+  region: 'İç Anadolu'
 -
   plate_number: 69
   name: 'Bayburt'
   phone_code: 458
   metropolitan_municipality_since: null
+  region: 'Karadeniz'
 -
   plate_number: 70
   name: 'Karaman'
   phone_code: 338
   metropolitan_municipality_since: null
+  region: 'İç Anadolu'
 -
   plate_number: 71
   name: 'Kırıkkale'
   phone_code: 318
   metropolitan_municipality_since: null
+  region: 'İç Anadolu'
 -
   plate_number: 72
   name: 'Batman'
   phone_code: 488
   metropolitan_municipality_since: null
+  region: 'Güneydoğu Anadolu'
 -
   plate_number: 73
   name: 'Şırnak'
   phone_code: 486
   metropolitan_municipality_since: null
+  region: 'Güneydoğu Anadolu'
 -
   plate_number: 74
   name: 'Bartın'
   phone_code: 378
   metropolitan_municipality_since: null
+  region: 'Karadeniz'
 -
   plate_number: 75
   name: 'Ardahan'
   phone_code: 478
   metropolitan_municipality_since: null
+  region: 'Doğu Anadolu'
 -
   plate_number: 76
   name: 'Iğdır'
   phone_code: 476
   metropolitan_municipality_since: null
+  region: 'Doğu Anadolu'
 -
   plate_number: 77
   name: 'Yalova'
   phone_code: 226
   metropolitan_municipality_since: null
+  region: 'Marmara'
 -
   plate_number: 78
   name: 'Karabük'
   phone_code: 370
   metropolitan_municipality_since: null
+  region: 'Karadeniz'
 -
   plate_number: 79
   name: 'Kilis'
   phone_code: 348
   metropolitan_municipality_since: null
+  region: 'Güneydoğu Anadolu'
 -
   plate_number: 80
   name: 'Osmaniye'
   phone_code: 328
   metropolitan_municipality_since: null
+  region: 'Akdeniz'
 -
   plate_number: 81
   name: 'Düzce'
   phone_code: 380
-  metropolitan_municipality_since: null
\ No newline at end of file
+  metropolitan_municipality_since: null
+  region: 'Karadeniz'
\ No newline at end of file
diff --git a/spec/turkish_cities_spec.rb b/spec/turkish_cities_spec.rb
index f65d60e..0efdd46 100644
--- a/spec/turkish_cities_spec.rb
+++ b/spec/turkish_cities_spec.rb
@@ -84,6 +84,19 @@
     expect(city_array[14]).to eq 'İzmir'
   end
 
+  it 'lists cities by region' do
+    city_array = TurkishCities.list_cities({ region: 'Karadeniz' })
+    expect(city_array.size).to eq 18
+    expect(city_array[17]).to eq 'Düzce'
+  end
+
+  it 'lists only metropolitan municipality cities by region' do
+    city_array = TurkishCities.list_cities({ region: 'Karadeniz',
+                                             metropolitan_municipality: true })
+    expect(city_array.size).to eq 3
+    expect(city_array).to eq %w[Ordu Samsun Trabzon]
+  end
+
   it 'lists only metropolitan municipality cities by alphabetical order' do
     city_array = TurkishCities.list_cities({ alphabetically_sorted: true,
                                              metropolitan_municipality: true })
@@ -91,6 +104,14 @@
     expect(city_array[14]).to eq 'Kahramanmaraş'
   end
 
+  it 'lists cities with all filters' do
+    city_array = TurkishCities.list_cities({ alphabetically_sorted: true,
+                                             region: 'Marmara',
+                                             metropolitan_municipality: true })
+    expect(city_array.size).to eq 6
+    expect(city_array).to eq %w[Balıkesir Bursa İstanbul Kocaeli Sakarya Tekirdağ]
+  end
+
   it 'ignores wrong parameters' do
     city_array = TurkishCities.list_cities({ falanicly_sorted: true })
     expect(city_array.size).to eq 81