I visited Oconto on the morning of September 6, 2014 while I was in northeastern Wisconsin for the Door County Century ride. It was early on a Saturday morning, so there were not a lot of people around, and I had the chance to walk around the courthouse to take these photos.
The courthouse is basically three joined buildings. In the middle is the original courthouse which was built in 1891. To the left is the first addition which apparently houses the sheriff and law enforcement part of the county government. To the right is the most recent addition which houses the actual court rooms and offices.