River Icon

Post Commons

300 Alby St., Alton, IL 62002

(618) 433-8871

1 of 6 Photos

Back To Previous Page

Hours of Operation

Monday - Saturday: 7 a.m. to 2 p.m.


Red Diamonds

Post Commons can help host the wedding and reception of your dreams. This unique historic building can provide an overall capacity of 515 people. Each of their three main event spaces flow beautifully together for larger events, or you can rent one of the three event spaces individually with capacities of 110, 150, or 200.  

Post Commons is the new daytime living room for Alton. Located in the beautifully renovated 1909 Federal Post Office, it offers a relaxing atmosphere to enjoy world-class coffee, a brunch kitchen, whiskey bar and event space. Take in the beautiful views of the Mississippi River and linger as long as you like!


Red Diamonds
Dining & Entertainment
  • Breakfast:
  • Private Rooms Available:
  • WiFi Access:


Red Diamonds


Red Diamonds
Facility Info
Meeting Rooms
  • Number of Rooms 3
Hallie Room
  • Banquet Capacity: 200
Ryan Room
  • Banquet Capacity: 110
Post Master Room
  • Banquet Capacity: 15