Environs of London 1821
Click here for the scanned map which shows that Archway did not yet exist as Junction Road had not yet been built. 
 
Cross’s New Plan of London 1861
A close up of Upper Holloway shows a pub called the St John’s Arms on Junction Road, the Archway Tavern at the southern end of Highgate Hill, and St John’s Church on Holloway Road, but only a handful of other buildings and streets. 

Standford’s Map of London 1862
Click here for a view including Highgate (see Hargrave Park Road in the bottom righthand corner) and here for the top of Holloway Road.  It’s clear that at that stage the area was still mostly fields. 

Booth Poverty Map
Click here to see the scanned version of the Victorian’s street by street analysis of central London. Only part of Archway features with only one pocket of real poverty. Interestingly, the High Streets, with properties presumably  work and home to shop keepers, are shown as more prosperous than the side roads. 

London Borough of Islington Maps 
There are useful interactive maps of Islington hosted by the Council www.islington.gov.uk/map (The web site is regularly redesigned so this may change.) 

Old Maps
www.old-maps.co.uk
Shows maps covering the area around a specific postcode - takes time to load but allows you to zoom in.

Islington Trade Directories
Are available at the Islington Local History Centre, near City University.
islington Local and lists owner, occupiers, and profession for different buildings, searchable by year. 

There’s more at British History Online with a map of 1876 when there is more development, including the Whittington College Almshouses, later demolished to make way for the dual carriageway. And the Smallpox and Whittington Hospital on the site of the current hospital.