diff --git a/homeassistant/components/group/cover.py b/homeassistant/components/group/cover.py
index 0832d466f8c..2638ce072a3 100644
--- a/homeassistant/components/group/cover.py
+++ b/homeassistant/components/group/cover.py
@@ -200,6 +200,11 @@ class CoverGroup(CoverEntity):
         """Return current tilt position for all covers."""
         return self._tilt_position
 
+    @property
+    def device_state_attributes(self):
+        """Return the state attributes for the cover group."""
+        return {ATTR_ENTITY_ID: self._entities}
+
     async def async_open_cover(self, **kwargs):
         """Move the covers up."""
         data = {ATTR_ENTITY_ID: self._covers[KEY_OPEN_CLOSE]}
diff --git a/homeassistant/components/group/light.py b/homeassistant/components/group/light.py
index 56408f410b8..1136df7eac0 100644
--- a/homeassistant/components/group/light.py
+++ b/homeassistant/components/group/light.py
@@ -183,6 +183,11 @@ class LightGroup(light.LightEntity):
         """No polling needed for a light group."""
         return False
 
+    @property
+    def device_state_attributes(self):
+        """Return the state attributes for the light group."""
+        return {ATTR_ENTITY_ID: self._entity_ids}
+
     async def async_turn_on(self, **kwargs):
         """Forward the turn_on command to all lights in the light group."""
         data = {ATTR_ENTITY_ID: self._entity_ids}
diff --git a/tests/components/group/test_cover.py b/tests/components/group/test_cover.py
index 1adad3e3d85..98460762389 100644
--- a/tests/components/group/test_cover.py
+++ b/tests/components/group/test_cover.py
@@ -86,6 +86,12 @@ async def test_attributes(hass, setup_comp):
     state = hass.states.get(COVER_GROUP)
     assert state.state == STATE_CLOSED
     assert state.attributes[ATTR_FRIENDLY_NAME] == DEFAULT_NAME
+    assert state.attributes[ATTR_ENTITY_ID] == [
+        DEMO_COVER,
+        DEMO_COVER_POS,
+        DEMO_COVER_TILT,
+        DEMO_TILT,
+    ]
     assert ATTR_ASSUMED_STATE not in state.attributes
     assert state.attributes[ATTR_SUPPORTED_FEATURES] == 0
     assert ATTR_CURRENT_POSITION not in state.attributes
diff --git a/tests/components/group/test_light.py b/tests/components/group/test_light.py
index 70dab4472ed..1f68279ae05 100644
--- a/tests/components/group/test_light.py
+++ b/tests/components/group/test_light.py
@@ -34,17 +34,25 @@ from tests.async_mock import MagicMock
 
 async def test_default_state(hass):
     """Test light group default state."""
+    hass.states.async_set("light.kitchen", "on")
     await async_setup_component(
         hass,
         LIGHT_DOMAIN,
-        {LIGHT_DOMAIN: {"platform": DOMAIN, "entities": [], "name": "Bedroom Group"}},
+        {
+            LIGHT_DOMAIN: {
+                "platform": DOMAIN,
+                "entities": ["light.kitchen", "light.bedroom"],
+                "name": "Bedroom Group",
+            }
+        },
     )
     await hass.async_block_till_done()
 
     state = hass.states.get("light.bedroom_group")
     assert state is not None
-    assert state.state == STATE_UNAVAILABLE
+    assert state.state == STATE_ON
     assert state.attributes[ATTR_SUPPORTED_FEATURES] == 0
+    assert state.attributes.get(ATTR_ENTITY_ID) == ["light.kitchen", "light.bedroom"]
     assert state.attributes.get(ATTR_BRIGHTNESS) is None
     assert state.attributes.get(ATTR_HS_COLOR) is None
     assert state.attributes.get(ATTR_COLOR_TEMP) is None