In most cases, an opinion that is designated by the initials of the attorney general addresses issues that are or may be of interest to persons throughout the state. A letter opinion generally addresses issues that are local in nature or that affect the interests of a particular person or group. The "LO" designation, however, does not mean that a document is any less authoritative than one denominated by reference to the particular attorney general's initials. On January 4, 1999, Attorney General John Cornyn discontinued the practice of issuing letter opinions. All attorney general opinions are now issued under the Attorney General's initials, i.e., Attorney General Ken Paxton's opinions would be named KP-0001, KP-0002, etc.
For Open Letter Rulings or Open Record Decisions, please go to: Open Government.
| Attorney General | Letter Opinion or Advisory |
| Ken Paxton 2015-Present |
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| Greg Abbott 2002-2014 |
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| John Cornyn 1999-2002 |
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| Dan Morales 1991-1998 |
LO92-001 to LO98-127 |
| Jim Mattox 1983-1990 |
LO88-001 to LO90-110 |
| Mark White 1979-1982 |
|
| John L. Hill 1973-1978 |
LA-1 to LA-157 |
| Crawford Martin 1967-1972 |
|
| Waggoner Carr 1963-1966 |
|
| Will Wilson 1957-1962 |
|
| John Ben Shepperd 1953-1956 |
MS-1 to MS-223 |
| Price Daniel 1947-1952 |
|
| Grover Sellers 1944-1946 |
|
| Gerald Mann 1939-1943 |