Travelers are voting Diamond Lake Park as the best campground near Grinnell. There are 3 campgrounds near Marengo a city just 30 km from Grinnell and 6 campgrounds near Williamsburg which is 37 km distant. The most popular of these are Amana Colonies Rv Park near Marengo and Sleepy Hollow Rv Park And Campground in Williamsburg. You can find 48 campgrounds in Iowa and 6213 campgrounds in the country of United States. Our members favorite in Iowa is Spook Cave Campground and Logging Creek Campground is the top pick in United States. Want more? Check out our map of campgrounds near Grinnell.