diff --git a/stubs/openpyxl/openpyxl/cell/cell.pyi b/stubs/openpyxl/openpyxl/cell/cell.pyi
index 73f03a8f3938..c6c4c63ad5fc 100644
--- a/stubs/openpyxl/openpyxl/cell/cell.pyi
+++ b/stubs/openpyxl/openpyxl/cell/cell.pyi
@@ -1,4 +1,7 @@
+import datetime
 from _typeshed import Incomplete
+from decimal import Decimal
+from typing_extensions import TypeAlias
 
 from openpyxl.styles.styleable import StyleableObject
 
@@ -19,6 +22,11 @@ TYPE_ERROR: str
 TYPE_FORMULA_CACHE_STRING: str
 VALID_TYPES: Incomplete
 
+_Numeric: TypeAlias = int | float | Decimal | Incomplete  # numpy types
+_Time: TypeAlias = datetime.datetime | datetime.date | datetime.time | datetime.timedelta
+_String: TypeAlias = str | bytes
+_Value: TypeAlias = _Numeric | _Time | _String | bool | None
+
 def get_type(t, value): ...
 def get_time_format(t): ...
 
@@ -35,7 +43,7 @@ class Cell(StyleableObject):
         style_array: Incomplete | None = ...,
     ) -> None: ...
     @property
-    def coordinate(self): ...
+    def coordinate(self) -> str: ...
     @property
     def col_idx(self): ...
     @property
@@ -47,9 +55,9 @@ class Cell(StyleableObject):
     def check_string(self, value): ...
     def check_error(self, value): ...
     @property
-    def value(self): ...
+    def value(self) -> _Value: ...
     @value.setter
-    def value(self, value) -> None: ...
+    def value(self, value: _Value) -> None: ...
     @property
     def internal_value(self): ...
     @property
diff --git a/stubs/openpyxl/openpyxl/reader/excel.pyi b/stubs/openpyxl/openpyxl/reader/excel.pyi
index f611811d70f8..cf09b8324cec 100644
--- a/stubs/openpyxl/openpyxl/reader/excel.pyi
+++ b/stubs/openpyxl/openpyxl/reader/excel.pyi
@@ -1,4 +1,8 @@
 from _typeshed import Incomplete
+from pathlib import Path
+from typing import BinaryIO
+
+from openpyxl.workbook.workbook import Workbook
 
 SUPPORTED_FORMATS: Incomplete
 
@@ -23,4 +27,6 @@ class ExcelReader:
     def read_worksheets(self) -> None: ...
     def read(self) -> None: ...
 
-def load_workbook(filename, read_only: bool = ..., keep_vba=..., data_only: bool = ..., keep_links: bool = ...): ...
+def load_workbook(
+    filename: str | Path | BinaryIO, read_only: bool = ..., keep_vba: bool = ..., data_only: bool = ..., keep_links: bool = ...
+) -> Workbook: ...
diff --git a/stubs/openpyxl/openpyxl/workbook/workbook.pyi b/stubs/openpyxl/openpyxl/workbook/workbook.pyi
index d00206ca48e4..65e59202d600 100644
--- a/stubs/openpyxl/openpyxl/workbook/workbook.pyi
+++ b/stubs/openpyxl/openpyxl/workbook/workbook.pyi
@@ -1,5 +1,7 @@
 from _typeshed import Incomplete
 
+from openpyxl.worksheet.worksheet import Worksheet
+
 INTEGER_TYPES: Incomplete
 
 class Workbook:
@@ -44,7 +46,7 @@ class Workbook:
     def __contains__(self, key): ...
     def index(self, worksheet): ...
     def get_index(self, worksheet): ...
-    def __getitem__(self, key): ...
+    def __getitem__(self, key: str) -> Worksheet | Incomplete: ...
     def __delitem__(self, key) -> None: ...
     def __iter__(self): ...
     def get_sheet_names(self): ...
diff --git a/stubs/openpyxl/openpyxl/worksheet/cell_range.pyi b/stubs/openpyxl/openpyxl/worksheet/cell_range.pyi
index 72edc3e2942d..66adfe680a4e 100644
--- a/stubs/openpyxl/openpyxl/worksheet/cell_range.pyi
+++ b/stubs/openpyxl/openpyxl/worksheet/cell_range.pyi
@@ -5,10 +5,10 @@ from openpyxl.descriptors import Strict
 from openpyxl.descriptors.serialisable import Serialisable
 
 class CellRange(Serialisable):  # type: ignore[misc]
-    min_col: Incomplete
-    min_row: Incomplete
-    max_col: Incomplete
-    max_row: Incomplete
+    min_col: int
+    min_row: int
+    max_col: int
+    max_row: int
     title: Incomplete
     def __init__(
         self,
@@ -60,7 +60,7 @@ class CellRange(Serialisable):  # type: ignore[misc]
     def right(self): ...
 
 class MultiCellRange(Strict):
-    ranges: Incomplete
+    ranges: list[CellRange]
     def __init__(self, ranges=...) -> None: ...
     def __contains__(self, coord): ...
     def add(self, coord) -> None: ...
diff --git a/stubs/openpyxl/openpyxl/worksheet/worksheet.pyi b/stubs/openpyxl/openpyxl/worksheet/worksheet.pyi
index bfa34fe19e53..cc30651ac7ce 100644
--- a/stubs/openpyxl/openpyxl/worksheet/worksheet.pyi
+++ b/stubs/openpyxl/openpyxl/worksheet/worksheet.pyi
@@ -1,8 +1,11 @@
 from _typeshed import Incomplete
 from collections.abc import Generator
 
+from openpyxl.cell.cell import Cell, _Value as CellValue
 from openpyxl.workbook.child import _WorkbookChild
 
+from .cell_range import MultiCellRange
+
 class Worksheet(_WorkbookChild):
     mime_type: str
     BREAK_NONE: int
@@ -25,6 +28,7 @@ class Worksheet(_WorkbookChild):
     ORIENTATION_PORTRAIT: str
     ORIENTATION_LANDSCAPE: str
     def __init__(self, parent, title: Incomplete | None = ...) -> None: ...
+    merged_cells: MultiCellRange
     @property
     def sheet_view(self): ...
     @property
@@ -43,8 +47,8 @@ class Worksheet(_WorkbookChild):
     def freeze_panes(self): ...
     @freeze_panes.setter
     def freeze_panes(self, topLeftCell: Incomplete | None = ...) -> None: ...
-    def cell(self, row, column, value: Incomplete | None = ...): ...
-    def __getitem__(self, key): ...
+    def cell(self, row: int, column: int, value: CellValue | None = ...) -> Cell: ...
+    def __getitem__(self, key: slice | int | str) -> Cell | Generator[tuple[Cell, ...], None, None]: ...
     def __setitem__(self, key, value) -> None: ...
     def __iter__(self): ...
     def __delitem__(self, key) -> None: ...