diff --git a/homeassistant/components/geo_location/trigger.py b/homeassistant/components/geo_location/trigger.py
index bc04490e76c..24632e78454 100644
--- a/homeassistant/components/geo_location/trigger.py
+++ b/homeassistant/components/geo_location/trigger.py
@@ -1,10 +1,20 @@
 """Offer geolocation automation rules."""
+from __future__ import annotations
+
 import logging
+from typing import Final
 
 import voluptuous as vol
 
 from homeassistant.const import CONF_EVENT, CONF_PLATFORM, CONF_SOURCE, CONF_ZONE
-from homeassistant.core import CALLBACK_TYPE, HassJob, HomeAssistant, callback
+from homeassistant.core import (
+    CALLBACK_TYPE,
+    Event,
+    HassJob,
+    HomeAssistant,
+    State,
+    callback,
+)
 from homeassistant.helpers import condition, config_validation as cv
 from homeassistant.helpers.config_validation import entity_domain
 from homeassistant.helpers.event import TrackStates, async_track_state_change_filtered
@@ -13,13 +23,11 @@ from homeassistant.helpers.typing import ConfigType
 
 from . import DOMAIN
 
-# mypy: allow-untyped-defs, no-check-untyped-defs
-
 _LOGGER = logging.getLogger(__name__)
 
-EVENT_ENTER = "enter"
-EVENT_LEAVE = "leave"
-DEFAULT_EVENT = EVENT_ENTER
+EVENT_ENTER: Final = "enter"
+EVENT_LEAVE: Final = "leave"
+DEFAULT_EVENT: Final = EVENT_ENTER
 
 TRIGGER_SCHEMA = cv.TRIGGER_BASE_SCHEMA.extend(
     {
@@ -33,9 +41,9 @@ TRIGGER_SCHEMA = cv.TRIGGER_BASE_SCHEMA.extend(
 )
 
 
-def source_match(state, source):
+def source_match(state: State | None, source: str) -> bool:
     """Check if the state matches the provided source."""
-    return state and state.attributes.get("source") == source
+    return state is not None and state.attributes.get("source") == source
 
 
 async def async_attach_trigger(
@@ -47,12 +55,12 @@ async def async_attach_trigger(
     """Listen for state changes based on configuration."""
     trigger_data = trigger_info["trigger_data"]
     source: str = config[CONF_SOURCE].lower()
-    zone_entity_id = config.get(CONF_ZONE)
-    trigger_event = config.get(CONF_EVENT)
+    zone_entity_id: str = config[CONF_ZONE]
+    trigger_event: str = config[CONF_EVENT]
     job = HassJob(action)
 
     @callback
-    def state_change_listener(event):
+    def state_change_listener(event: Event) -> None:
         """Handle specific state changes."""
         # Skip if the event's source does not match the trigger's source.
         from_state = event.data.get("old_state")