De Lorme, based in Maine, has an atlas for every state. They are at a larger scale (i.e. features on the map are larger) than the Benchmark series, and they show tremendous detail.
The DeLorme atlases are excellent for back road exploring, they show everything that is on the large scale USGS topo maps. Early editions had crudely drawn contours, but now they feature shaded relief and accurate contours. The gazetteer is useful, listing all the place names on the maps, plus points of interest such as parks, boat ramps, and information centers.
The DeLorme maps don't show the attention to detail, field checking, and careful design of the Benchmark products. Nonetheless I have bought all of DeLorme's western states editions and use them as a backup for the Benchmark Atlases. They are the only atlases available for some states.