diff --git a/gradio/interface.py b/gradio/interface.py
index 8e8c162197..542927a096 100644
--- a/gradio/interface.py
+++ b/gradio/interface.py
@@ -40,7 +40,7 @@ class Interface:
     def __init__(self, fn, inputs, outputs, saliency=None, verbose=False, examples=None,
                  live=False, show_input=True, show_output=True,
                  capture_session=False, title=None, description=None,
-                 thumbnail=None, server_name=networking.LOCALHOST_NAME):
+                 thumbnail=None,  server_port=None, server_name=networking.LOCALHOST_NAME):
         """
         Parameters:
         fn (Callable): the function to wrap an interface around.
@@ -97,7 +97,7 @@ class Interface:
         self.description = description
         self.thumbnail = thumbnail
         self.examples = examples
-        self.server_port = None
+        self.server_port = server_port
         self.simple_server = None
         Interface.instances.add(self)
 
@@ -270,7 +270,8 @@ class Interface:
 
         output_directory = tempfile.mkdtemp()
         # Set up a port to serve the directory containing the static files with interface.
-        server_port, httpd = networking.start_simple_server(self, output_directory, self.server_name)
+        server_port, httpd = networking.start_simple_server(self, output_directory, self.server_name,
+                                                            server_port=self.server_port)
         path_to_local_server = "http://{}:{}/".format(self.server_name, server_port)
         networking.build_template(output_directory)
 
diff --git a/gradio/networking.py b/gradio/networking.py
index a7b366b76c..c4a39bef46 100644
--- a/gradio/networking.py
+++ b/gradio/networking.py
@@ -18,13 +18,12 @@ import sys
 import analytics
 
 
-INITIAL_PORT_VALUE = (
-    7860
-)  # The http server will try to open on port 7860. If not available, 7861, 7862, etc.
-TRY_NUM_PORTS = (
-    100
-)  # Number of ports to try before giving up and throwing an exception.
-LOCALHOST_NAME = os.getenv('GRADIO_SERVER_NAME', "127.0.0.1")
+INITIAL_PORT_VALUE = os.getenv(
+    'GRADIO_SERVER_PORT', "7860")  # The http server will try to open on port 7860. If not available, 7861, 7862, etc.
+TRY_NUM_PORTS = os.getenv(
+    'GRADIO_NUM_PORTS', "100")  # Number of ports to try before giving up and throwing an exception.
+LOCALHOST_NAME = os.getenv(
+    'GRADIO_SERVER_NAME', "127.0.0.1")
 GRADIO_API_SERVER = "https://api.gradio.app/v1/tunnel-request"
 
 STATIC_TEMPLATE_LIB = pkg_resources.resource_filename("gradio", "templates/")
@@ -231,9 +230,11 @@ def serve_files_in_background(interface, port, directory_to_serve=None, server_n
     return httpd
 
 
-def start_simple_server(interface, directory_to_serve=None, server_name=None):
+def start_simple_server(interface, directory_to_serve=None, server_name=None, server_port=None):
+    if server_port is None:
+        server_port = INITIAL_PORT_VALUE
     port = get_first_available_port(
-        INITIAL_PORT_VALUE, INITIAL_PORT_VALUE + TRY_NUM_PORTS
+        server_port, server_port + TRY_NUM_PORTS
     )
     httpd = serve_files_in_background(interface, port, directory_to_serve, server_name)
     return port, httpd