 At Belleville, the seat of Republic County, US-36 has an interchange with US-81.After passing through Washington County, US-36 picks up a brief concurrency with US-77 in Marysville, the seat of Marshall County, and another one with US-75 in Fairview.Between the junctions with US-77 and US-75, the highway passes through Nemaha County and its seat, Seneca.