The Colonial/Postcolonial New Researchers’ Workshop is currently inviting abstract submissions for the 2018/9 academic year. The workshop was established in 2008, to provide a forum for postgraduates and early career researchers to meet and present their work or new research in an informal environment.
The primary purpose of H-Albion is to enable historians more easily to discuss research interests, teaching methods and the state of historiography. H-Albion is especially interested in methods of teaching history to graduate and undergraduate students in diverse settings.
By the time of the Horwood map of London (1792-9) London streets were extensively numbered:
I have notes from NYC newspapers of the 1780s indicating that advertisers had begun to give an address with a house number in their ads.
The first one is:
LYON JONAS, FURRIER from LONDON, At the sign of the TIGER and MUFF, No. 21, Broad Street, opposite the Post-Office. . . . [with an illustration of the sign]
N-Y Gazette; and the W Mercury, December 10, 1781, p. 4, col. ?
I can only offer solid information on house numbers in Philadelphia in the eighteenth (and nineteenth) century. Uniform house numbering did not go into effect until the mid-19th there.
The British Library has a (seemingly) endless supply of letters in their manuscript collections. Most of the writers I've seen from c18 (thousands of them) used the following on the cover fold (there was not usually an envelope):