Pigot was a major directory publisher starting in 1814 and the following directories include Hertfordshire: Pigot & Co's London & Provincial New Commercial Directory for 1823-4 Pigot & Co's London & Provincial New Commercial Directory for 1826-7 Pigot & Co's London & Provincial New Commercial Directory for 1832-3-4 Pigot & Co's Royal National and Commercial Directory and Topography of the Counties of Essex, Herts, Middleses, September 1839 There might be slight variations in quoted dates and it may be that different editions, possibly with minor revisions, were issued.

Pigot & Co's London & Provincial New Commercial Directory for 1823-4 includes a number of Hertfordshire Towns, organised by town within county. A copy of the Hertfordshire pages has been published on CD from S & N Genealogy Supplies. For smaller places, such as Redbourn the main part of the list is divided into Shopkeepers, &c and Taverns and Public Houses, both in alphabetical order and it is easy to check, the following being the Tavern and Public Houses listed:

Black Horse, Wm. Sibley
Bull Inn, Mrs J Stephens
Cricketers, T. Scrivener
Crown, Wm. Anstee
George, L. Noddle
Lion & Lamb, T. Mace
Princes Head, Jas. Dell
Red Lion, Wm. Smith
Tom in Bedlam, John Marshall
White Hart Inn, Wm. Gilbert
White Horse, Thomas. Mansell

For larger places the trades were classified, and street names given, as the following extract from the 1826 edition of Pigot & Co's London London & Provincial New Commercial Direrectory for St Albans shows:

Gutteridge Philip, Market place
Manlove Richard, Holywell hill
Mason John, High st

Kinder Thos. St. Peter st
Searancke Francis, Fishpool st
Varney James, Fishpool st

Dunham John, Fishpool st
Fowley Thos. Fishpool st
Heath Thos. Dagnell lane
Smith ----, St. Peter st

I have not seen the 1832-3-4 edition and there is a facsimile edition of the 1839 Essex Herts & Middlesex volume available in many genealogy libraries.

The names from the Hitchin section of the 1839 directory are down loadable from the Hitchin Museum site.

See LDS Holdings of Hertfordshire Directories

Examples of its use: Coaches and Inns, Redbourn, 1830's

If you can add to the information given above tell me.