The index is organized by time period. The tables are sortable by each column. They are rather big, so loading maybe a bit slow. Have patience!
Visitors can view the basic index with name, publication date, volume, and page number. GSBC Members can log-into the Members' area to view and expanded index which includes more information about the index entry.
In 1924 the Hackensack Republican published some articles about entries in the 1887-88 and 1871-72 City Directories. They updated some of the information as well. These pages have been scanned. The index can be found here.
If you prefer the old alphabetical index you can still access them through these links