BATHURST

Created in 1822 from Eastern District, abolished in 1849

Lanark 1824-1849

Carleton (transferred from Johnstown District) 1822-1838 (transferred to Dalhousie District)

Renfrew 1845-1849

BROCK

Created in 1839 from London District, abolished in 1849

Oxford (transferred from London District) 1839-1849

COLBORNE

Created in 1841 from Newcastle District, abolished in 1849

Peterborough (transferred from Newcastle District) 1841-1849

DALHOUSIE

Created in 1842, from Bathurst District, abolished in 1849

Carleton (transferred from Bathurst District) 1842-1849

EASTERN

Created in 1788 as Lunenburg District, renamed in 1792, abolished in 1849

Dundas 1792-1849

Glengarry 1798-1849

Grenville 1792-1800 (transferred to Johnstown District)

Leeds 1792-1800 (transferred to Johnstown District)

Ontario (comprised of the Islands in the St. Lawrence River) 1792-1800 (abolished)

Prescott 1800-1816 (transferred to Ottawa District)

Russell 1800-1816 (transferred to Ottawa District)

Stormont 1792-1849

GORE

Created in 1816 from Home and Niagara Districts, abolished in 1849

Halton 1816-1849

Wentworth 1816-1849

HOME

Created in 1788 as Nassau District, renamed in 1792, abolished in 1849

Durham 1792-1802 (transferred to Newcastle District)

Lincoln 1792-1798 (transferred to Niagara District)

Norfolk [part] 1792-1798 (transferred to London District)

Northumberland 1792-1802 (transferred to Newcastle District)

Simcoe 1821-1843 (transferred to Simcoe District)

York 1792-1849

HURON

Created in 1841 from London District, abolished in 1849

Huron (transferred from London District) 1841-1849

JOHNSTOWN

Created in 1800 from Eastern District, abolished in 1849

Leeds (transferred from Eastern District) 1800-1849

Grenville (transferred from Eastern District) 1800-1849

Carleton 1800-1822 (transferred to Bathurst District)

LONDON

Created in 1800 from Home and Western Districts, abolished in 1849

Middlesex 1800-1849

Huron 1835-1841

Norfolk (transferred from Western District) 1800-1837 (transferred to Talbot District)

Oxford 1800-1839 (transferred to Brock District)

MIDLAND

Created in 1788 as Mecklenburg District, renamed in 1792, abolished in 1849

Frontenac 1792-1849

Addington 1792-1849 (merged with Lennox County in 1800)

Lennox 1792-1849 (merged with Addington County in 1800)

Hastings 1792-1839 (transferred to Victoria District)

Prince Edward 1792-1831 (transferred to Prince Edward District)

NEWCASTLE

Created in 1802 from Home District, abolished in 1849

Durham (transferred from Home District) 1802-1849

Northumberland (transferred from Home District) 1802-1849

Peterborough 1878-1841 (transferred to Colborne District)

NIAGARA

Created in 1800 from Home District, abolished in 1849

Haldimand 1800-1849

Lincoln (transferred from Home District) 1800-1849

Welland (created from Lincoln County) 1845-1849

OTTAWA

Created in 1816 from Eastern District, abolished in 1849

Russell (transferred from Eastern District) 1816-1849

Prescott (transferred from Eastern District) 1816-1849

PRINCE EDWARD

Created in 1834 from Midland District, abolished in 1849

Prince Edward (transferred from Midland District) 1834-1849

SIMCOE

Created in 1843 from Home District, abolished in 1849

Simcoe (transferred from Home District) 1843-1849

TALBOT

Created in 1837 from London District, abolished in 1849

Norfolk (transferred from London District) 1837-1849

VICTORIA

Created in 1839 from Midland District, abolished in 1849

Hastings (transferred from Midland District) 1839-1849

WELLINGTON

Created in 1840 from Gore, Simcoe, and Huron Districts, abolished in 1849

Waterloo 1840-1849

WESTERN

Created in 1788 as Hesse District, renamed in 1792, abolished in 1849

Essex 1792-1849

Kent 1792-1849

Norfolk [part] 1792-1798 (transferred to London District)