See Notes below for an explanation of the colour codes.
Dates in red indicate that the county meridian and its sheet lines changed from this time onwards. The county series indexes (1854-1886) on this website will therefore only apply to the county maps before these dates. (Those counties with new meridians in the 1890s have their new sheets lines shown on the OS One-Inch 2nd edition maps).
Dates in dark green indicate a partial revision of the county, with only some maps published.
Dates in light green indicate that the county was revised, with maps published, only at the 6" to the mile scale (ie. there are no 25" to the mile maps).
Dates in violet indicate that the 6" to the mile maps were published on full sheets rather than quarter sheets.
County County Survey 1st revision 2nd revision 3rd revision Aberdeenshire 1864-71 1899-1901 1923-25 Argyllshire 1862-77 1897-98 1914-15 Ayrshire 1854-59 1893-96 1907-09 1937-38 Banffshire 1865-70 1900-01 1928-29 Berwickshire 1855-57 1896-98 1905-06 Buteshire 1855-64 1895-96 1914-15 Caithness-shire 1870-72 1904-05 Clackmannanshire 1859-63 1895-99 1920 1931 Dumfriesshire 1854-58 1898-99 1916-17 / 1929-30 Dumbartonshire - main 1858-61 1894-98 1914 1936-38 Dumbartonshire - detached 1858-61 1894-98 1914 1936-38 Edinburghshire 1850-52 1893-94 1905-06, 1912-13 1931 Elginshire 1866-71 1902-04 Fifeshire 1852-55 1893-95 1912-13 1924-25, 1938-43 Forfarshire 1857-62 1898-1902 1920-23 Haddingtonshire 1852-54 1892-93 1906 1932/38 Inverness-shire - Mainland 1866-76 1899-1903 1929/38 Inverness-shire - Skye 1874-77 1898-1901 Inverness-shire - Hebrides 1876 1901 Kincardineshire 1863-65 1899-1902 1922-23 Kinross-shire 1853-54 1893-95 1913 Kirkcudbrightshire 1845-50 1893-94 1907-08 1931 Lanarkshire 1856-59 1892-97 1908-11 Linlithgowshire 1854-56 1894-96 1913 Nairnshire 1866-69 1903-04 Orkney 1877-78 1900 Peeblesshire 1855-58 1897-98 1906 Perthshire 1859-64 1894-1900 1930-31 Renfrewshire 1856-58 1892-96 1908-12 1937-40 Ross & Cromarty - Mainland 1868-75 1901-05 Ross & Cromarty - Lewis 1848-52 1895-96 Roxburghshire 1856-59 1896-98 1916-19 Selkirkshire 1856-59 1897 1930 Stirlingshire 1858-63 1895-96 1913-14 1938-43 Sutherland 1868-73 1903-05 Wigtonshire 1843-47 1892-95 1906-07 Zetland 1877-78 1900 1928
Notes