Parish registers online
820,000 Cumberland baptisms and marriages are included in the IGI at FamilySearch but not all parishes are included (you can see the coverage here).
Findmypast has about 50,000 baptisms and marriages, and a few thousand burial entries.
Ancestry has 4500 baptisms for the parishes of Isel and Kirkoswald, and almost 7000 marriages.
The volunteers of FreeREG have transcribed some of the registers for 9 Cumberland parishes. There is no Online Parish Clerks project for Cumberland.
Births, marriages and deaths
Registration districts in Cumberland
Pre-1841 censuses
Holm Cultram 1821, Isel 1811, 1815, Maryport 1765, 1792, Newton Reigny pt 1821, Skelton pt 1821, Waberthwaite 1821, Whitehaven 1685, 1762
Also consider....
Reproduced courtesy of Francis Frith.
Key Cumberland resources
Carlisle Archive Centre holds records for the part of the Cumberland north of the River Derwent, including Carlisle, Keswick, Penrith, and Maryport.
Whitehaven Archive and Local Studies Centre holds records for the area south of the River Derwent, which includes Cockermouth, Whitehaven, and Workington.
Cumbria Family History Society covers the historic counties of Cumberland and Westmorland, as well as parts of North Lancashire and North Yorkshire.
