Located in
Dekalb County
Somonauk Post Offices
Here are all Somonauk IL post office locations. There are many post offices in or around Somonauk, Illinois to choose from. Below is the location of each Somonauk post office. Get the most up-to-date post office hours in Somonauk. Find phone numbers and map out the exact location of the post office you are looking for.