Farringdon is a district in central London, in the modern borough of Islington (London, England).

In London Labour and the London Poor:

Of the Quantity of Shrubs, "Roots," Flowers, etc., sold in the Streets, and of the Buyers. (Volume 1)

Of Two Orphan Flower Girls. (Volume 1)

Watercress Girl. (Volume 1)

Falmouth is a town on the River Fal in Cornwall, UK.

In London Labour and the London Poor:

The Coalbackers. (Volume 3)

Exeter is a city in Devon, on the River Exe, in southwest England.

In London Labour and the London Poor edition: 

Phase 1

Execution Dock was the site of a scaffold in Wapping, London, in the modern borough of Tower Hamlets. It was historically used to execute pirates, smugglers and mutineers. The last executions were in 1830.

In London Labour and the London Poor edition: 

Phase 1

Euston Square is a square in the modern borough of Camden in central London, England.

In London Labour and the London Poor:

Of the Uneducated State of Costermongers. (Volume 1)

Possibly refers to Eaton Mews in Belgravia, London, which would have originally been stables for houses in Eaton Square.

In London Labour and the London Poor: 

The Whistling Man. (Volume 3) [as Eton Mews]

Eton College, founded 1440, is a prestigious public school located in Eton, Berkshire, England.

In London Labour and the London Poor:

MEETING OF TICKET-OF-LEAVE MEN (Volume 3)