There is no single online portal for finding literary archives. Explore the following archive aggregators, but understand that an author's papers are not always all held in one institution or in the country, region, or state you might expect. These aggregators typically provide access to collection finding aids and records from multiple institutions. Some include links to digitized items or full collections; most do not. Searching the web for digital archives or editions is also advised. For indepth reading on locating and using archives, see SAA's Finding and Evaluating Archives.
Local and Regional Archive Aggregators
National and International Archive Aggregators
Zora Neale Hurston