Ordnance Survey maps
Survey and revision dates for county series mapping, 1843-1943
Compiled with thanks from Richard Oliver's Ordnance Survey maps: a concise guide for historians (3rd ed, 2013, pp. 230-81).
Dates in red indicate that the county meridian and its sheet lines changed from this time onwards.
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 | 1931-32 |
| Elginshire | 1866-71 | 1902-04 | ||
| Fifeshire | 1852-55 | 1893-95 | 1912-13 | 1924-25, 1938-43 |
| Forfarshire | 1857-62 | 1898-1902 | 1920-23 | 1937-38 |
| 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 | 1943 |
| Kirkcudbrightshire | 1845-50 | 1893-94 | 1907-08 | 1931 |
| Lanarkshire | 1856-59 | 1892-97 | 1908-11 | 1933-42 |
| 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 |