Marylebone was one of five parliamentary boroughs in the metropolitan area of London enfranchised in 1832.
The constituency was defined as consisting of three civil parishes in Middlesex:
St Marylebone
Paddington
St Pancras
The commissioners appointed to fix parliamentary boundaries recommended that the part of St Pancras parish north of the Regent's Canal should not form part of the constituency and should remain in the parliamentary county of Middlesex as this was still a largely rural area.
The inhabitants of St. Pancras, however, petitioned parliament for the inclusion of the entire parish, and this was accepted.

In 1885 the entity was split into eight new single-member divisions.
These were Marylebone East, Marylebone West, Paddington North, Paddington South, St. Pancras East, St. Pancras North, St. Pancras South and St. Pancras West.
Marylebone was one of five parliamentary boroughs in the metropolitan area of London enfranchised in 1832. The constituency was defined as consisting of three civil parishes in Middlesex:
St Marylebone
Paddington
St Pancras
The commissioners appointed to fix parliamentary boundaries recommended that the part of St Pancras parish north of the Regent's Canal should not form part of the constituency and should remain in the parliamentary county of Middlesex as this was still a largely rural area. The inhabitants of St. Pancras, however, petitioned parliament for the inclusion of the entire parish, and this was accepted.
In 1885 the entity was split into eight new single-member divisions. These were Marylebone East, Marylebone West, Paddington North, Paddington South, St. Pancras East, St. Pancras North, St. Pancras South and St. Pancras West.
Marylebone (UK Parliament constituency)