The Family History Library has Wilmington city directories for:
| 1814, 1845, 1853, 1857
||FHL fiche 6044647-50|
|1859/1860||FHL fiche 6043859|
|1862-1901||FHL films 1377595-605|
|1934||FHL film 1307613|
The most extensive collections of city and business directories are at the University of Delaware Library, Newark, Delaware 19717-5267. The Delaware Public Archives has directories from 1814 to the 1970s. The Historical Society of Delaware also has a major collection of directories for Wilmington, the state of Delaware, and the Delmarva Peninsula.
Wilmington 1889 City Directory: http://distantcousin.com/Directories/DE/Wilmington/1889/