I suppose my answer would have to be "city," but it's a stretch to call a place with a population of 36,000 a "city." It's paired with another town, Champaign, Illinois, with about 64,000 people... so the whole "urban" area has a population of a little over 100,000. I guess the two towns together could qualify as a city.
The whole place has more of a "suburb" feel, but you can't call it that because this is the largest urban area for sixty miles in any direction!