I've found it useful in locating the 'no longer existing' townships cited in old documents.
For the heck of it, asked for locations of 'Mahoney'. Results surprised me.
If you 'click' on item you get a detailed chart. Below the chart you can 'click' on 'show location' and get maps which can be 'zoomed in & out'. http://mapping.usgs.gov:8888/gnis/owa/gnisprod?f_name=Mahoney&variant=N&f_state=&f_cnty=&f_type=&pop1=&pop2=&elev1=&elev2=&cell=&tab=y