This data was obtained from the Bureau of Land Management and covers 3/4 of the western United States (click map image to see actual coverage)
DeLorme has packaged the Township and Range data in an easy-to-use fashion that displays as polygons within XMap. The Township and Range polygons may be overlaid onto existing DeLorme rasters and vectors. No section polygons are included in this dataset.
http://www.delorme.com/professional/townshiprange/default.asp