diff --git a/lib/ClangImporter/ClangImporter.cpp b/lib/ClangImporter/ClangImporter.cpp
index b33024d299adb..0fdb66d8184e6 100644
--- a/lib/ClangImporter/ClangImporter.cpp
+++ b/lib/ClangImporter/ClangImporter.cpp
@@ -42,6 +42,7 @@
 #include "swift/Basic/Defer.h"
 #include "swift/Basic/Platform.h"
 #include "swift/Basic/Range.h"
+#include "swift/Basic/SourceLoc.h"
 #include "swift/Basic/StringExtras.h"
 #include "swift/Basic/Version.h"
 #include "swift/ClangImporter/ClangImporterRequests.h"
@@ -2854,14 +2855,12 @@ ClangImporter::Implementation::exportSourceLoc(SourceLoc loc) {
 
 SourceLoc
 ClangImporter::Implementation::importSourceLoc(clang::SourceLocation loc) {
-  // FIXME: Implement!
-  return SourceLoc();
+  return BuffersForDiagnostics.resolveSourceLocation(Instance->getSourceManager(), loc);
 }
 
 SourceRange
-ClangImporter::Implementation::importSourceRange(clang::SourceRange loc) {
-  // FIXME: Implement!
-  return SourceRange();
+ClangImporter::Implementation::importSourceRange(clang::SourceRange range) {
+  return SourceRange(importSourceLoc(range.getBegin()), importSourceLoc(range.getEnd()));
 }
 
 #pragma mark Importing names
@@ -5975,9 +5974,10 @@ cloneBaseMemberDecl(ValueDecl *decl, DeclContext *newContext) {
   if (auto typeAlias = dyn_cast<TypeAliasDecl>(decl)) {
     auto rawMemory = allocateMemoryForDecl<TypeAliasDecl>(
         typeAlias->getASTContext(), sizeof(TypeAliasDecl), false);
-    auto out = new (rawMemory) TypeAliasDecl(
-        typeAlias->getLoc(), typeAlias->getEqualLoc(), typeAlias->getName(),
-        typeAlias->getNameLoc(), typeAlias->getGenericParams(), newContext);
+    auto out = new (rawMemory)
+        TypeAliasDecl(typeAlias->getStartLoc(), typeAlias->getEqualLoc(),
+                      typeAlias->getName(), typeAlias->getNameLoc(),
+                      typeAlias->getGenericParams(), newContext);
     out->setUnderlyingType(typeAlias->getUnderlyingType());
     out->copyFormalAccessFrom(typeAlias);
     return out;
diff --git a/lib/ClangImporter/ImportDecl.cpp b/lib/ClangImporter/ImportDecl.cpp
index 5e1d349b17a96..7f975faae1800 100644
--- a/lib/ClangImporter/ImportDecl.cpp
+++ b/lib/ClangImporter/ImportDecl.cpp
@@ -43,6 +43,7 @@
 #include "swift/Basic/Assertions.h"
 #include "swift/Basic/Defer.h"
 #include "swift/Basic/PrettyStackTrace.h"
+#include "swift/Basic/SourceLoc.h"
 #include "swift/Basic/Statistic.h"
 #include "swift/Basic/StringExtras.h"
 #include "swift/Basic/Version.h"
@@ -6491,7 +6492,8 @@ Decl *SwiftDeclConverter::importGlobalAsInitializer(
   }
 
   auto result = Impl.createDeclWithClangNode<ConstructorDecl>(
-      decl, AccessLevel::Public, name, /*NameLoc=*/SourceLoc(), failable,
+      decl, AccessLevel::Public, name,
+      Impl.importSourceLoc(decl->getLocation()), failable,
       /*FailabilityLoc=*/SourceLoc(),
       /*Async=*/false, /*AsyncLoc=*/SourceLoc(),
       /*Throws=*/false, /*ThrowsLoc=*/SourceLoc(), /*ThrownType=*/TypeLoc(),
@@ -7006,7 +7008,8 @@ ConstructorDecl *SwiftDeclConverter::importConstructor(
   assert(!importedName.getAsyncInfo());
   auto result = Impl.createDeclWithClangNode<ConstructorDecl>(
       objcMethod, AccessLevel::Public, importedName.getDeclName(),
-      /*NameLoc=*/SourceLoc(), failability, /*FailabilityLoc=*/SourceLoc(),
+      /*NameLoc=*/Impl.importSourceLoc(objcMethod->getLocation()), failability,
+      /*FailabilityLoc=*/SourceLoc(),
       /*Async=*/false, /*AsyncLoc=*/SourceLoc(),
       /*Throws=*/importedName.getErrorInfo().has_value(),
       /*ThrowsLoc=*/SourceLoc(), /*ThrownType=*/TypeLoc(), bodyParams,
diff --git a/lib/ClangImporter/ImportType.cpp b/lib/ClangImporter/ImportType.cpp
index 82311a91db10d..5c8951572d59a 100644
--- a/lib/ClangImporter/ImportType.cpp
+++ b/lib/ClangImporter/ImportType.cpp
@@ -2788,7 +2788,15 @@ ParameterList *ClangImporter::Implementation::importFunctionParameterList(
   }
 
   // Form the parameter list.
-  return ParameterList::create(SwiftContext, parameters);
+  // Estimate locations for the begin and end of parameter list.
+  auto begin = clangDecl->getLocation();
+  auto end = begin;
+  if (!params.empty()) {
+    begin = params.front()->getBeginLoc();
+    end = params.back()->getEndLoc();
+  }
+  return ParameterList::create(SwiftContext, importSourceLoc(begin), parameters,
+                               importSourceLoc(end));
 }
 
 static bool isObjCMethodResultAudited(const clang::Decl *decl) {
diff --git a/lib/ClangImporter/ImporterImpl.h b/lib/ClangImporter/ImporterImpl.h
index 18939159e273a..83913f85df085 100644
--- a/lib/ClangImporter/ImporterImpl.h
+++ b/lib/ClangImporter/ImporterImpl.h
@@ -23,12 +23,14 @@
 #include "ImportName.h"
 #include "SwiftLookupTable.h"
 #include "swift/AST/ASTContext.h"
+#include "swift/AST/Decl.h"
 #include "swift/AST/ForeignErrorConvention.h"
 #include "swift/AST/LazyResolver.h"
 #include "swift/AST/Module.h"
 #include "swift/AST/RequirementSignature.h"
 #include "swift/AST/Type.h"
 #include "swift/Basic/FileTypes.h"
+#include "swift/Basic/SourceLoc.h"
 #include "swift/Basic/StringExtras.h"
 #include "swift/ClangImporter/ClangImporter.h"
 #include "swift/ClangImporter/ClangModule.h"
@@ -1719,6 +1721,20 @@ class LLVM_LIBRARY_VISIBILITY ClangImporter::Implementation
     if (!isa<ParamDecl>(D))
       importSwiftAttrAttributes(D);
 
+    if constexpr (std::is_base_of_v<NominalTypeDecl, DeclTy>) {
+      // Estimate brace locations.
+      auto begin = ClangN.getAsDecl()->getBeginLoc();
+      auto end = ClangN.getAsDecl()->getEndLoc();
+      SourceRange range;
+      if (begin.isValid() && end.isValid() && D->getNameLoc().isValid())
+        range = SourceRange(importSourceLoc(begin), importSourceLoc(end));
+      else {
+        range = SourceRange(D->getNameLoc(), D->getNameLoc());
+      }
+      // Invariant: range.isValid() == D->getNameLoc().isValid()
+      D->setBraces(range);
+    }
+
     return D;
   }