Many of Earle's letters have been preserved and are located in the Earle Collection at the Merseyside Maritime Museum. The letters cover 20 months, from 23 January 1760 to 23 September 1761. The collection comprises just under 500 letters to about 100 correspondents written by William Earle and his clerks. The letters detail his business activities. About 10 percent of the letters were sent to Joseph Wimpey of Newgate Street in London. Wimpey supplied him with financial services and advice.
