To determine the correct 1930 census enumeration district for the area you wish to search, try this online tool, Obtaining EDs for the (1900-1940) Census in One Step (Large Cities). This page has links to additional tools to search for the descriptions of enumeration districts in smaller areas.
Some public libraries offer free home access (through their websites) to Heritage Quest, which has searchable images of the 1930 census. NOTE: the 1930 index on HeritageQuest is not complete, though all of the images are browsable.