diff --git a/src/World.Net.UnitTests/Countries/DenmarkTest.cs b/src/World.Net.UnitTests/Countries/DenmarkTest.cs
new file mode 100644
index 0000000..60e7d7f
--- /dev/null
+++ b/src/World.Net.UnitTests/Countries/DenmarkTest.cs
@@ -0,0 +1,38 @@
+namespace World.Net.UnitTests.Countries;
+public sealed class DenmarkTest
+{
+    private const string DENMARK_NAME = "Denmark";
+    private const int DENMARK_STATE_COUNT = 5;
+    private const string DENMARK_OFFICIAL_NAME = "Kingdom of Denmark";
+    private const string DENMARK_NATIVE_NAME = "Danmark";
+    private const string DENMARK_CAPITAL = "Copenhagen";
+    private const int DENMARK_NUMERIC_CODE = 208;
+    private const string DENMARK_ISO2_CODE = "DK";
+    private const string DENMARK_ISO3_CODE = "DNK";
+    private readonly string[] DENMARK_CALLING_CODE = ["+45"];
+    private static readonly string[] VALID_STATE_TYPES = { "Region" };
+
+    [Fact]
+    public void GetCountry_ReturnsCorrectInformation_ForDenmark()
+    {
+        // Arrange
+        CountryIdentifier existingCountryId = CountryIdentifier.Denmark;
+
+        // Act
+        var country = CountryProvider.GetCountry(existingCountryId);
+
+        //Assert
+        Assert.Equal(existingCountryId, country.Id);
+        Assert.Equal(DENMARK_NAME, country.Name);
+        Assert.NotNull(country.States);
+        Assert.Equal(DENMARK_STATE_COUNT, country.States.Count());
+        Assert.Equal(DENMARK_OFFICIAL_NAME, country.OfficialName);
+        Assert.Equal(DENMARK_NATIVE_NAME, country.NativeName);
+        Assert.Equal(DENMARK_CAPITAL, country.Capital);
+        Assert.Equal(DENMARK_NUMERIC_CODE, country.NumericCode);
+        Assert.Equal(DENMARK_ISO2_CODE, country.ISO2Code);
+        Assert.Equal(DENMARK_ISO3_CODE, country.ISO3Code);
+        Assert.All(country.States, state => Assert.Contains(state.Type, VALID_STATE_TYPES));
+        Assert.Equal(DENMARK_CALLING_CODE, country.CallingCode);
+    }
+}
diff --git a/src/World.Net.UnitTests/Countries/DjiboutiTest.cs b/src/World.Net.UnitTests/Countries/DjiboutiTest.cs
new file mode 100644
index 0000000..3427822
--- /dev/null
+++ b/src/World.Net.UnitTests/Countries/DjiboutiTest.cs
@@ -0,0 +1,38 @@
+namespace World.Net.UnitTests.Countries;
+public sealed class DjiboutiTest
+{
+    private const string DJIBOUTI_NAME = "Djibouti";
+    private const int DJIBOUTI_STATE_COUNT = 6;
+    private const string DJIBOUTI_OFFICIAL_NAME = "Republic of Djibouti";
+    private const string DJIBOUTI_NATIVE_NAME = "Djibouti";
+    private const string DJIBOUTI_CAPITAL = "Djibouti";
+    private const int DJIBOUTI_NUMERIC_CODE = 262;
+    private const string DJIBOUTI_ISO2_CODE = "DJ";
+    private const string DJIBOUTI_ISO3_CODE = "DJI";
+    private static readonly string[] VALID_STATE_TYPES = { "Region", "City" };
+    private readonly string[] DJIBOUTI_CALLING_CODE = ["+253"];
+
+    [Fact]
+    public void GetCountry_ReturnsCorrectInformation_ForDjibouti()
+    {
+        // Arrange
+        CountryIdentifier existingCountryId = CountryIdentifier.Djibouti;
+
+        // Act
+        var country = CountryProvider.GetCountry(existingCountryId);
+
+        //Assert
+        Assert.Equal(existingCountryId, country.Id);
+        Assert.Equal(DJIBOUTI_NAME, country.Name);
+        Assert.NotNull(country.States);
+        Assert.Equal(DJIBOUTI_STATE_COUNT, country.States.Count());
+        Assert.Equal(DJIBOUTI_OFFICIAL_NAME, country.OfficialName);
+        Assert.Equal(DJIBOUTI_NATIVE_NAME, country.NativeName);
+        Assert.Equal(DJIBOUTI_CAPITAL, country.Capital);
+        Assert.Equal(DJIBOUTI_NUMERIC_CODE, country.NumericCode);
+        Assert.Equal(DJIBOUTI_ISO2_CODE, country.ISO2Code);
+        Assert.Equal(DJIBOUTI_ISO3_CODE, country.ISO3Code);
+        Assert.Equal(DJIBOUTI_CALLING_CODE, country.CallingCode);
+        Assert.All(country.States, state => Assert.Contains(state.Type, VALID_STATE_TYPES));
+    }
+}
diff --git a/src/World.Net.UnitTests/Countries/DominicaTest.cs b/src/World.Net.UnitTests/Countries/DominicaTest.cs
new file mode 100644
index 0000000..0c838f9
--- /dev/null
+++ b/src/World.Net.UnitTests/Countries/DominicaTest.cs
@@ -0,0 +1,38 @@
+namespace World.Net.UnitTests.Countries;
+public sealed class DominicaTest
+{
+    private const string DOMINICA_NAME = "Dominica";
+    private const int DOMINICA_STATE_COUNT = 10;
+    private const string DOMINICA_OFFICIAL_NAME = "Commonwealth of Dominica";
+    private const string DOMINICA_NATIVE_NAME = "Dominica";
+    private const string DOMINICA_CAPITAL = "Roseau";
+    private const int DOMINICA_NUMERIC_CODE = 212;
+    private const string DOMINICA_ISO2_CODE = "DM";
+    private const string DOMINICA_ISO3_CODE = "DMA";
+    private static readonly string[] VALID_STATE_TYPES = { "Parish" };
+    private readonly string[] DOMINICA_CALLING_CODE = ["+1-767"];
+
+    [Fact]
+    public void GetCountry_ReturnsCorrectInformation_ForDominica()
+    {
+        // Arrange
+        CountryIdentifier existingCountryId = CountryIdentifier.Dominica;
+
+        // Act
+        var country = CountryProvider.GetCountry(existingCountryId);
+
+        //Assert
+        Assert.Equal(existingCountryId, country.Id);
+        Assert.Equal(DOMINICA_NAME, country.Name);
+        Assert.NotNull(country.States);
+        Assert.Equal(DOMINICA_STATE_COUNT, country.States.Count());
+        Assert.Equal(DOMINICA_OFFICIAL_NAME, country.OfficialName);
+        Assert.Equal(DOMINICA_NATIVE_NAME, country.NativeName);
+        Assert.Equal(DOMINICA_CAPITAL, country.Capital);
+        Assert.Equal(DOMINICA_NUMERIC_CODE, country.NumericCode);
+        Assert.Equal(DOMINICA_ISO2_CODE, country.ISO2Code);
+        Assert.Equal(DOMINICA_ISO3_CODE, country.ISO3Code);
+        Assert.All(country.States, state => Assert.Contains(state.Type, VALID_STATE_TYPES));
+        Assert.Equal(DOMINICA_CALLING_CODE, country.CallingCode);
+    }
+}
diff --git a/src/World.Net/Countries/Denmark.cs b/src/World.Net/Countries/Denmark.cs
new file mode 100644
index 0000000..5ef09fb
--- /dev/null
+++ b/src/World.Net/Countries/Denmark.cs
@@ -0,0 +1,40 @@
+namespace World.Net.Countries;
+internal sealed class Denmark : ICountry
+{
+    ///<inheritdoc/>
+    public CountryIdentifier Id => CountryIdentifier.Denmark;
+
+    ///<inheritdoc/>
+    public string Name => nameof(Denmark);
+
+    ///<inheritdoc/>
+    public string OfficialName { get; } = "Kingdom of Denmark";
+
+    ///<inheritdoc/>
+    public string NativeName { get; } = "Danmark";
+
+    ///<inheritdoc/>
+    public string Capital { get; } = "Copenhagen";
+
+    ///<inheritdoc/>
+    public int NumericCode { get; } = 208;
+
+    ///<inheritdoc/>
+    public string ISO2Code { get; } = "DK";
+
+    ///<inheritdoc/>
+    public string ISO3Code { get; } = "DNK";
+
+    ///<inheritdoc/>
+    public string[] CallingCode { get; } = ["+45"];
+
+    ///<inheritdoc/>
+    public IEnumerable<State> States { get; } =
+    [
+        new("Central Denmark", "DK-82", "Region"),
+        new("Capital Region of Denmark", "DK-84", "Region"),
+        new("North Denmark", "DK-81", "Region"),
+        new("Southern Denmark", "DK-83", "Region"),
+        new("Zealand", "DK-85", "Region"),
+    ];
+}
diff --git a/src/World.Net/Countries/Djibouti.cs b/src/World.Net/Countries/Djibouti.cs
new file mode 100644
index 0000000..aff884c
--- /dev/null
+++ b/src/World.Net/Countries/Djibouti.cs
@@ -0,0 +1,41 @@
+namespace World.Net.Countries;
+internal sealed class Djibouti : ICountry
+{
+    ///<inheritdoc/>
+    public CountryIdentifier Id => CountryIdentifier.Djibouti;
+
+    ///<inheritdoc/>
+    public string Name => nameof(Djibouti);
+
+    ///<inheritdoc/>
+    public string OfficialName { get; } = "Republic of Djibouti";
+
+    ///<inheritdoc/>
+    public string NativeName { get; } = "Djibouti";
+
+    ///<inheritdoc/>
+    public string Capital { get; } = "Djibouti";
+
+    ///<inheritdoc/>
+    public int NumericCode { get; } = 262;
+
+    ///<inheritdoc/>
+    public string ISO2Code { get; } = "DJ";
+
+    ///<inheritdoc/>
+    public string ISO3Code { get; } = "DJI";
+
+    ///<inheritdoc/>
+    public string[] CallingCode { get; } = ["+253"];
+
+    ///<inheritdoc/>
+    public IEnumerable<State> States { get; } =
+    [
+        new("Ali Sabieh", "DJ-AS", "Region"),
+        new("Arta", "DJ-AR", "Region"),
+        new("Dikhil", "DJ-DI", "Region"),
+        new("Djibouti", "DJ-DJ", "City"),
+        new("Obock", "DJ-OB", "Region"),
+        new("Tadjourah", "DJ-TA", "Region"),
+    ];
+}
diff --git a/src/World.Net/Countries/Dominica.cs b/src/World.Net/Countries/Dominica.cs
new file mode 100644
index 0000000..35c01f4
--- /dev/null
+++ b/src/World.Net/Countries/Dominica.cs
@@ -0,0 +1,45 @@
+namespace World.Net.Countries;
+internal sealed class Dominica : ICountry
+{
+    ///<inheritdoc/>
+    public CountryIdentifier Id => CountryIdentifier.Dominica;
+
+    ///<inheritdoc/>
+    public string Name => nameof(Dominica);
+
+    ///<inheritdoc/>
+    public string OfficialName { get; } = "Commonwealth of Dominica";
+
+    ///<inheritdoc/>
+    public string NativeName { get; } = "Dominica";
+
+    ///<inheritdoc/>
+    public string Capital { get; } = "Roseau";
+
+    ///<inheritdoc/>
+    public int NumericCode { get; } = 212;
+
+    ///<inheritdoc/>
+    public string ISO2Code { get; } = "DM";
+
+    ///<inheritdoc/>
+    public string ISO3Code { get; } = "DMA";
+
+    ///<inheritdoc/>
+    public string[] CallingCode { get; } = ["+1-767"];
+
+    ///<inheritdoc/>
+    public IEnumerable<State> States { get; } =
+    [
+        new("Saint Andrew", "DM-02", "Parish"),
+        new("Saint David", "DM-03", "Parish"),
+        new("Saint George", "DM-04", "Parish"),
+        new("Saint John", "DM-05", "Parish"),
+        new("Saint Joseph", "DM-06", "Parish"),
+        new("Saint Luke", "DM-07", "Parish"),
+        new("Saint Mark", "DM-08", "Parish"),
+        new("Saint Patrick", "DM-09", "Parish"),
+        new("Saint Paul", "DM-10", "Parish"),
+        new("Saint Peter", "DM-11", "Parish"),
+    ];
+}
diff --git a/src/World.Net/Helpers/CountryInitializer.cs b/src/World.Net/Helpers/CountryInitializer.cs
index b3747cf..cef1808 100644
--- a/src/World.Net/Helpers/CountryInitializer.cs
+++ b/src/World.Net/Helpers/CountryInitializer.cs
@@ -45,12 +45,12 @@ public static Dictionary<CountryIdentifier, ICountry> Initialize()
             { CountryIdentifier.Cambodia, new Cambodia() },
             { CountryIdentifier.Cameroon, new Cameroon() },
             { CountryIdentifier.Canada, new Canada() },
-            { CountryIdentifier.CapeVerde, new CapeVerde() },           
-            { CountryIdentifier.CaymanIslands, new CaymanIslands() },           
-            { CountryIdentifier.CentralAfricanRepublic, new CentralAfricanRepublic() },           
-            { CountryIdentifier.Chad, new Chad() },           
-            { CountryIdentifier.Chile, new Chile() },           
-            { CountryIdentifier.China, new China() }, 
+            { CountryIdentifier.CapeVerde, new CapeVerde() },
+            { CountryIdentifier.CaymanIslands, new CaymanIslands() },
+            { CountryIdentifier.CentralAfricanRepublic, new CentralAfricanRepublic() },
+            { CountryIdentifier.Chad, new Chad() },
+            { CountryIdentifier.Chile, new Chile() },
+            { CountryIdentifier.China, new China() },
             { CountryIdentifier.ChristmasIsland, new ChristmasIsland() },
             { CountryIdentifier.CocosKeelingIslands, new CocosKeelingIslands() },
             { CountryIdentifier.Colombia, new Colombia() },
@@ -68,6 +68,9 @@ public static Dictionary<CountryIdentifier, ICountry> Initialize()
             { CountryIdentifier.TimorLeste, new TimorLeste() },
             { CountryIdentifier.Ecuador, new Ecuador() },
             { CountryIdentifier.Egypt, new Egypt() },
+            { CountryIdentifier.Denmark, new Denmark() },
+            { CountryIdentifier.Djibouti, new Djibouti() },
+            { CountryIdentifier.Dominica, new Dominica() },
 
             // Future countries can be added here in the same format.
         };