diff --git a/src/PostalRegistry/PostalInformation/Commands/UpdatePostalNames.cs b/src/PostalRegistry/PostalInformation/Commands/UpdatePostalNames.cs
new file mode 100644
index 00000000..6df87e5a
--- /dev/null
+++ b/src/PostalRegistry/PostalInformation/Commands/UpdatePostalNames.cs
@@ -0,0 +1,47 @@
+namespace PostalRegistry.PostalInformation.Commands
+{
+    using System;
+    using System.Collections.Generic;
+    using Be.Vlaanderen.Basisregisters.Generators.Guid;
+    using Be.Vlaanderen.Basisregisters.GrAr.Provenance;
+    using Be.Vlaanderen.Basisregisters.Utilities;
+
+    public sealed class UpdatePostalNames : IHasCommandProvenance
+    {
+        private static readonly Guid Namespace = new Guid("6af54580-27cc-4b16-a6c9-d14eee229ed8");
+
+        public PostalCode PostalCode { get; }
+
+        public IReadOnlyCollection<PostalName> PostalNamesToAdd { get; }
+        public IReadOnlyCollection<PostalName> PostalNamesToRemove { get; }
+        public Provenance Provenance { get; }
+
+        public UpdatePostalNames(
+            PostalCode postalCode,
+            IReadOnlyCollection<PostalName> postalNamesToAdd,
+            IReadOnlyCollection<PostalName> postalNamesToRemove,
+            Provenance provenance)
+        {
+            PostalCode = postalCode;
+            PostalNamesToAdd = postalNamesToAdd;
+            PostalNamesToRemove = postalNamesToRemove;
+            Provenance = provenance;
+        }
+
+        public Guid CreateCommandId()
+            => Deterministic.Create(Namespace, $"UpdatePostalNames-{ToString()}");
+
+        public override string? ToString()
+            => ToStringBuilder.ToString(IdentityFields());
+
+        private IEnumerable<object> IdentityFields()
+        {
+            yield return PostalCode;
+
+            foreach (var field in Provenance.GetIdentityFields())
+            {
+                yield return field;
+            }
+        }
+    }
+}
diff --git a/src/PostalRegistry/PostalInformation/Exceptions/PostalNameAlreadyExistsException.cs b/src/PostalRegistry/PostalInformation/Exceptions/PostalNameAlreadyExistsException.cs
new file mode 100644
index 00000000..3b4c8569
--- /dev/null
+++ b/src/PostalRegistry/PostalInformation/Exceptions/PostalNameAlreadyExistsException.cs
@@ -0,0 +1,20 @@
+namespace PostalRegistry.PostalInformation.Exceptions
+{
+    using System;
+    using System.Runtime.Serialization;
+
+    [Serializable]
+    public sealed class PostalNameAlreadyExistsException : PostalRegistryException
+    {
+        public PostalName PostalName { get; }
+
+        public PostalNameAlreadyExistsException(PostalName postalName)
+        {
+            PostalName = postalName;
+        }
+
+        private PostalNameAlreadyExistsException(SerializationInfo info, StreamingContext context)
+            : base(info, context)
+        { }
+    }
+}
diff --git a/src/PostalRegistry/PostalInformation/PostalInformation.cs b/src/PostalRegistry/PostalInformation/PostalInformation.cs
index c2e7ea47..2b1491e7 100755
--- a/src/PostalRegistry/PostalInformation/PostalInformation.cs
+++ b/src/PostalRegistry/PostalInformation/PostalInformation.cs
@@ -93,5 +93,21 @@ public void RelinkMunicipality(NisCode newNisCode)
 
             ApplyChange(new MunicipalityWasRelinked(PostalCode, newNisCode, NisCode!));
         }
+
+        public void UpdatePostalNames(
+            IReadOnlyCollection<PostalName> postalNamesToAdd,
+            IReadOnlyCollection<PostalName> postalNamesToRemove)
+        {
+            foreach (var postalName in postalNamesToRemove.Where(_postalNames.Contains))
+                ApplyChange(new PostalInformationPostalNameWasRemoved(PostalCode, postalName));
+
+            foreach (var postalName in postalNamesToAdd)
+            {
+                if(_postalNames.Contains(postalName))
+                   throw new PostalNameAlreadyExistsException(postalName);
+
+                ApplyChange(new PostalInformationPostalNameWasAdded(PostalCode, postalName));
+            }
+        }
     }
 }
diff --git a/src/PostalRegistry/PostalInformation/PostalInformationCommandHandlerModule.cs b/src/PostalRegistry/PostalInformation/PostalInformationCommandHandlerModule.cs
index 1989ae06..1ec9fd13 100755
--- a/src/PostalRegistry/PostalInformation/PostalInformationCommandHandlerModule.cs
+++ b/src/PostalRegistry/PostalInformation/PostalInformationCommandHandlerModule.cs
@@ -82,6 +82,17 @@ public PostalInformationCommandHandlerModule(
 
                     postalInformation.RelinkMunicipality(message.Command.NewNisCode);
                 });
+
+            For<UpdatePostalNames>()
+                .AddSqlStreamStore(getStreamStore, getUnitOfWork, eventMapping, eventSerializer)
+                .AddProvenance(getUnitOfWork, postalInformationProvenanceFactory)
+                .Handle(async (message, ct) =>
+                {
+                    var postalCode = new PostalCode(message.Command.PostalCode);
+                    var postalInformation = await getPostalInformationSet().GetAsync(postalCode, ct);
+
+                    postalInformation.UpdatePostalNames(message.Command.PostalNamesToAdd, message.Command.PostalNamesToRemove);
+                });
         }
     }
 }
diff --git a/src/PostalRegistry/PostalInformation/PostalInformationState.cs b/src/PostalRegistry/PostalInformation/PostalInformationState.cs
index ddec7b12..e1c8a258 100755
--- a/src/PostalRegistry/PostalInformation/PostalInformationState.cs
+++ b/src/PostalRegistry/PostalInformation/PostalInformationState.cs
@@ -8,11 +8,11 @@ namespace PostalRegistry.PostalInformation
 
     public partial class PostalInformation
     {
-        public PostalCode PostalCode { get; private set; }
         private PostalInformationStatus? _status;
-
         private readonly List<PostalName> _postalNames = new List<PostalName>();
 
+        public PostalCode PostalCode { get; private set; }
+        public IReadOnlyCollection<PostalName> PostalNames => _postalNames.AsReadOnly();
         public NisCode? NisCode { get; set; }
         public Modification LastModification { get; private set; }
 
diff --git a/test/PostalRegistry.Tests/AggregateTests/WhenUpdatingPostalNames/GivenNoPostalInformation.cs b/test/PostalRegistry.Tests/AggregateTests/WhenUpdatingPostalNames/GivenNoPostalInformation.cs
new file mode 100644
index 00000000..0e0ec699
--- /dev/null
+++ b/test/PostalRegistry.Tests/AggregateTests/WhenUpdatingPostalNames/GivenNoPostalInformation.cs
@@ -0,0 +1,35 @@
+namespace PostalRegistry.Tests.AggregateTests.WhenUpdatingPostalNames
+{
+    using AutoFixture;
+    using Be.Vlaanderen.Basisregisters.AggregateSource;
+    using Be.Vlaanderen.Basisregisters.AggregateSource.Testing;
+    using global::AutoFixture;
+    using PostalInformation;
+    using PostalInformation.Commands;
+    using Xunit;
+    using Xunit.Abstractions;
+
+    public class GivenNoPostalInformation : PostalRegistryTest
+    {
+        private readonly Fixture _fixture;
+
+        public GivenNoPostalInformation(ITestOutputHelper testOutputHelper) : base(testOutputHelper)
+        {
+            _fixture = new Fixture();
+            _fixture.Customize(new WithFixedPostalCode());
+            _fixture.Customize(new WithIntegerNisCode());
+        }
+
+        [Fact]
+        public void ThenAggregateNotFoundExceptionIsThrown()
+        {
+            var command = _fixture.Create<UpdatePostalNames>();
+
+            Assert(
+                new Scenario()
+                    .Given()
+                    .When(command)
+                    .Throws(new AggregateNotFoundException(command.PostalCode.ToString(), typeof(PostalInformation))));
+        }
+    }
+}
diff --git a/test/PostalRegistry.Tests/AggregateTests/WhenUpdatingPostalNames/GivenPostalInformation.cs b/test/PostalRegistry.Tests/AggregateTests/WhenUpdatingPostalNames/GivenPostalInformation.cs
new file mode 100644
index 00000000..0e993266
--- /dev/null
+++ b/test/PostalRegistry.Tests/AggregateTests/WhenUpdatingPostalNames/GivenPostalInformation.cs
@@ -0,0 +1,98 @@
+namespace PostalRegistry.Tests.AggregateTests.WhenUpdatingPostalNames
+{
+    using System.Collections.Generic;
+    using AutoFixture;
+    using Be.Vlaanderen.Basisregisters.AggregateSource;
+    using Be.Vlaanderen.Basisregisters.AggregateSource.Testing;
+    using Be.Vlaanderen.Basisregisters.GrAr.Provenance;
+    using Builders;
+    using FluentAssertions;
+    using global::AutoFixture;
+    using PostalInformation;
+    using PostalInformation.Commands;
+    using PostalInformation.Events;
+    using PostalInformation.Exceptions;
+    using Xunit;
+    using Xunit.Abstractions;
+
+    public class GivenPostalInformation : PostalRegistryTest
+    {
+        private readonly Fixture _fixture;
+
+        public GivenPostalInformation(ITestOutputHelper testOutputHelper) : base(testOutputHelper)
+        {
+            _fixture = new Fixture();
+            _fixture.Customize(new WithFixedPostalCode());
+            _fixture.Customize(new WithIntegerNisCode());
+            _fixture.Customize(new InfrastructureCustomization());
+        }
+
+        [Fact]
+        public void GivenNameAlreadyExists_ThenPostalNameAlreadyExistsExceptionIsThrown()
+        {
+            var named = _fixture.Create<PostalInformationPostalNameWasAdded>();
+            var postalName = new PostalName(named.Name, named.Language);
+            var command = new UpdatePostalNames(_fixture.Create<PostalCode>(),
+                [postalName],
+                new List<PostalName>(),
+                _fixture.Create<Provenance>());
+
+            Assert(
+                new Scenario()
+                    .Given(
+                        command.PostalCode,
+                        _fixture.Create<PostalInformationWasRegistered>(),
+                        named)
+                    .When(command)
+                    .Throws(new PostalNameAlreadyExistsException(postalName)));
+        }
+
+        [Fact]
+        public void ThenPostalNamesAreUpdated()
+        {
+            var named = _fixture.Create<PostalInformationPostalNameWasAdded>();
+            var nameToAdd = new PostalName(_fixture.Create<string>(), Language.Dutch);
+            var command = new UpdatePostalNames(_fixture.Create<PostalCode>(),
+                [nameToAdd],
+                [new PostalName(named.Name, named.Language)],
+                _fixture.Create<Provenance>());
+
+            Assert(
+                new Scenario()
+                    .Given(
+                        command.PostalCode,
+                        _fixture.Create<PostalInformationWasRegistered>(),
+                        named)
+                    .When(command)
+                    .Then(new Fact(command.PostalCode,
+                            new PostalInformationPostalNameWasRemoved(command.PostalCode, new PostalName(named.Name, named.Language))),
+                        new Fact(command.PostalCode,
+                            new PostalInformationPostalNameWasAdded(command.PostalCode, nameToAdd))));
+        }
+
+        [Fact]
+        public void StateCheck()
+        {
+            // Arrange
+            var postalInformationPostalNameWasAdded = _fixture.Create<PostalInformationPostalNameWasAdded>();
+            var postalInformationPostalNameWasRemoved = new PostalInformationPostalNameWasRemovedBuilder(_fixture)
+                .WithName(postalInformationPostalNameWasAdded.Name, postalInformationPostalNameWasAdded.Language)
+                .Build();
+            var postalInformationPostalNameWasAdded2 = _fixture.Create<PostalInformationPostalNameWasAdded>();
+
+            // Act
+            var sut = PostalInformation.Factory();
+            sut.Initialize([
+                _fixture.Create<PostalInformationWasRegistered>(),
+                _fixture.Create<MunicipalityWasAttached>(),
+                postalInformationPostalNameWasAdded,
+                postalInformationPostalNameWasRemoved,
+                postalInformationPostalNameWasAdded2
+            ]);
+
+            // Assert
+            sut.PostalNames.Count.Should().Be(1);
+            sut.PostalNames.Should().Contain(x => x.Name == postalInformationPostalNameWasAdded2.Name && x.Language == postalInformationPostalNameWasAdded2.Language);
+        }
+    }
+}