diff --git a/homeassistant/components/heos/media_player.py b/homeassistant/components/heos/media_player.py
index 0a5bcdc4d0a..cca8ad2bf4f 100644
--- a/homeassistant/components/heos/media_player.py
+++ b/homeassistant/components/heos/media_player.py
@@ -413,7 +413,7 @@ class HeosMediaPlayer(MediaPlayerEntity):
         return self._source_manager.source_list
 
     @property
-    def state(self) -> str:
+    def state(self) -> MediaPlayerState:
         """State of the player."""
         return PLAY_STATE_TO_STATE[self._player.state]
 
diff --git a/homeassistant/components/russound_rio/media_player.py b/homeassistant/components/russound_rio/media_player.py
index c639e5ddc90..fc0dca341a8 100644
--- a/homeassistant/components/russound_rio/media_player.py
+++ b/homeassistant/components/russound_rio/media_player.py
@@ -126,13 +126,14 @@ class RussoundZoneDevice(MediaPlayerEntity):
         return self._zone_var("name", self._name)
 
     @property
-    def state(self):
+    def state(self) -> MediaPlayerState | None:
         """Return the state of the device."""
         status = self._zone_var("status", "OFF")
         if status == "ON":
             return MediaPlayerState.ON
         if status == "OFF":
             return MediaPlayerState.OFF
+        return None
 
     @property
     def source(self):
diff --git a/homeassistant/components/xbox/media_player.py b/homeassistant/components/xbox/media_player.py
index 71ec382f04a..1d56cfc71c5 100644
--- a/homeassistant/components/xbox/media_player.py
+++ b/homeassistant/components/xbox/media_player.py
@@ -43,7 +43,7 @@ SUPPORT_XBOX = (
     | MediaPlayerEntityFeature.PLAY_MEDIA
 )
 
-XBOX_STATE_MAP = {
+XBOX_STATE_MAP: dict[PlaybackState | PowerState, MediaPlayerState | None] = {
     PlaybackState.Playing: MediaPlayerState.PLAYING,
     PlaybackState.Paused: MediaPlayerState.PAUSED,
     PowerState.On: MediaPlayerState.ON,
@@ -99,7 +99,7 @@ class XboxMediaPlayer(CoordinatorEntity[XboxUpdateCoordinator], MediaPlayerEntit
         return self.coordinator.data.consoles[self._console.id]
 
     @property
-    def state(self):
+    def state(self) -> MediaPlayerState | None:
         """State of the player."""
         status = self.data.status
         if status.playback_state in XBOX_STATE_MAP:
diff --git a/homeassistant/components/yamaha_musiccast/media_player.py b/homeassistant/components/yamaha_musiccast/media_player.py
index 9eb1be3c0fe..0a6203eddf2 100644
--- a/homeassistant/components/yamaha_musiccast/media_player.py
+++ b/homeassistant/components/yamaha_musiccast/media_player.py
@@ -145,7 +145,7 @@ class MusicCastMediaPlayer(MusicCastDeviceEntity, MediaPlayerEntity):
         return None
 
     @property
-    def state(self):
+    def state(self) -> MediaPlayerState:
         """Return the state of the player."""
         if self.coordinator.data.zones[self._zone_id].power == "on":
             if self._is_netusb and self.coordinator.data.netusb_playback == "pause":