diff --git a/botocore/args.py b/botocore/args.py
index cc11f7f5a4..179a0039ef 100644
--- a/botocore/args.py
+++ b/botocore/args.py
@@ -268,9 +268,8 @@ def compute_client_args(
                 disable_request_compression=(
                     client_config.disable_request_compression
                 ),
-                account_id_endpoint_mode=(
-                    client_config.account_id_endpoint_mode
-                ),
+                client_context_params=client_config.client_context_params,
+                account_id_endpoint_mode=client_config.account_id_endpoint_mode,
             )
         self._compute_retry_config(config_kwargs)
         self._compute_connect_timeout(config_kwargs)
@@ -657,14 +656,16 @@ def _build_endpoint_resolver(
             client_endpoint_url=endpoint_url,
             legacy_endpoint_url=endpoint.host,
         )
-        # botocore does not support client context parameters generically
-        # for every service. Instead, the s3 config section entries are
-        # available as client context parameters. In the future, endpoint
-        # rulesets of services other than s3/s3control may require client
-        # context parameters.
-        client_context = (
-            s3_config_raw if self._is_s3_service(service_name_raw) else {}
-        )
+        # Client context params for s3 conflict with the available settings
+        # in the `s3` parameter on the `Config` object. If the same parameter
+        # is set in both places, the value in the `s3` parameter takes priority.
+        if client_config is not None:
+            client_context = client_config.client_context_params or {}
+        else:
+            client_context = {}
+        if self._is_s3_service(service_name_raw):
+            client_context.update(s3_config_raw)
+
         sig_version = (
             client_config.signature_version
             if client_config is not None
@@ -765,9 +766,6 @@ def compute_endpoint_resolver_builtin_defaults(
                 's3_disable_multiregion_access_points', False
             ),
             EPRBuiltins.SDK_ENDPOINT: given_endpoint,
-            # account ID is calculated later if account based routing is
-            # enabled and configured for the service
-            EPRBuiltins.AWS_ACCOUNT_ID: None,
         }
 
     def _compute_user_agent_appid_config(self, config_kwargs):
diff --git a/botocore/config.py b/botocore/config.py
index 34810c5302..5cabe264c0 100644
--- a/botocore/config.py
+++ b/botocore/config.py
@@ -221,6 +221,15 @@ class Config:
 
         Defaults to None.
 
+    :type client_context_params: dict
+    :param client_context_params: A dictionary of parameters specific to
+        individual services. If available, valid parameters can be found in
+        the ``Client Context Parameters`` section of the service client's
+        documentation. Invalid parameters or ones that are not used by the
+        specified service will be ignored.
+
+        Defaults to None.
+
     :type account_id_endpoint_mode: str
     :param account_id_endpoint_mode: Set account ID based endpoint behavior
         for supported operations.
@@ -259,6 +268,7 @@ class Config:
             ('tcp_keepalive', None),
             ('request_min_compression_size_bytes', None),
             ('disable_request_compression', None),
+            ('client_context_params', None),
             ('account_id_endpoint_mode', None),
         ]
     )