diff --git a/homeassistant/components/modbus/__init__.py b/homeassistant/components/modbus/__init__.py
index a7b32119917..1a331e16482 100644
--- a/homeassistant/components/modbus/__init__.py
+++ b/homeassistant/components/modbus/__init__.py
@@ -3,7 +3,6 @@
 from __future__ import annotations
 
 import logging
-from typing import cast
 
 import voluptuous as vol
 
@@ -143,7 +142,7 @@ from .const import (
     UDP,
     DataType,
 )
-from .modbus import ModbusHub, async_modbus_setup
+from .modbus import DATA_MODBUS_HUBS, ModbusHub, async_modbus_setup
 from .validators import (
     duplicate_fan_mode_validator,
     duplicate_swing_mode_validator,
@@ -458,7 +457,7 @@ CONFIG_SCHEMA = vol.Schema(
 
 def get_hub(hass: HomeAssistant, name: str) -> ModbusHub:
     """Return modbus hub with name."""
-    return cast(ModbusHub, hass.data[DOMAIN][name])
+    return hass.data[DATA_MODBUS_HUBS][name]
 
 
 async def async_setup(hass: HomeAssistant, config: ConfigType) -> bool:
@@ -468,12 +467,12 @@ async def async_setup(hass: HomeAssistant, config: ConfigType) -> bool:
 
     async def _reload_config(call: Event | ServiceCall) -> None:
         """Reload Modbus."""
-        if DOMAIN not in hass.data:
+        if DATA_MODBUS_HUBS not in hass.data:
             _LOGGER.error("Modbus cannot reload, because it was never loaded")
             return
-        hubs = hass.data[DOMAIN]
-        for name in hubs:
-            await hubs[name].async_close()
+        hubs = hass.data[DATA_MODBUS_HUBS]
+        for hub in hubs.values():
+            await hub.async_close()
         reset_platforms = async_get_platforms(hass, DOMAIN)
         for reset_platform in reset_platforms:
             _LOGGER.debug("Reload modbus resetting platform: %s", reset_platform.domain)
@@ -487,7 +486,4 @@ async def async_setup(hass: HomeAssistant, config: ConfigType) -> bool:
 
     async_register_admin_service(hass, DOMAIN, SERVICE_RELOAD, _reload_config)
 
-    return await async_modbus_setup(
-        hass,
-        config,
-    )
+    return await async_modbus_setup(hass, config)
diff --git a/homeassistant/components/modbus/modbus.py b/homeassistant/components/modbus/modbus.py
index e9bd301c193..319c68f50f0 100644
--- a/homeassistant/components/modbus/modbus.py
+++ b/homeassistant/components/modbus/modbus.py
@@ -35,6 +35,7 @@ from homeassistant.helpers.discovery import async_load_platform
 from homeassistant.helpers.dispatcher import async_dispatcher_send
 from homeassistant.helpers.event import async_call_later
 from homeassistant.helpers.typing import ConfigType
+from homeassistant.util.hass_dict import HassKey
 
 from .const import (
     ATTR_ADDRESS,
@@ -70,6 +71,7 @@ from .const import (
 from .validators import check_config
 
 _LOGGER = logging.getLogger(__name__)
+DATA_MODBUS_HUBS: HassKey[dict[str, ModbusHub]] = HassKey(DOMAIN)
 
 
 ConfEntry = namedtuple("ConfEntry", "call_type attr func_name value_attr_name")  # noqa: PYI024
@@ -136,14 +138,14 @@ async def async_modbus_setup(
         config[DOMAIN] = check_config(hass, config[DOMAIN])
         if not config[DOMAIN]:
             return False
-    if DOMAIN in hass.data and config[DOMAIN] == []:
-        hubs = hass.data[DOMAIN]
-        for name in hubs:
-            if not await hubs[name].async_setup():
+    if DATA_MODBUS_HUBS in hass.data and config[DOMAIN] == []:
+        hubs = hass.data[DATA_MODBUS_HUBS]
+        for hub in hubs.values():
+            if not await hub.async_setup():
                 return False
-        hub_collect = hass.data[DOMAIN]
+        hub_collect = hass.data[DATA_MODBUS_HUBS]
     else:
-        hass.data[DOMAIN] = hub_collect = {}
+        hass.data[DATA_MODBUS_HUBS] = hub_collect = {}
 
     for conf_hub in config[DOMAIN]:
         my_hub = ModbusHub(hass, conf_hub)