| Location code | Code explanation | | ABD | Aberdeen |
| AGS | Angus |
| ARG | Argyll |
| AYR | Ayr |
| BNF | Banffshire |
| BWK | Berwick |
| DMF | Dumfries |
| DNB | Dunbarton |
| DURH | Durham |
| ELO | East Lothian |
| FIF | Fife |
| INV | Inverness |
| KCB | Kirkcudbright |
| KCD | Kincardinshire |
| KNR | Kinross |
| LNK | Lanark |
| MLO | Midlothian |
| MRY | Moray |
| NRN | Nairn |
| NULL | |
| ORK | Orkney |
| PBL | Peebles |
| PTH | Perth |
| RNF | Renfrew |
| ROS | Ross and Cromarty |
| ROX | Roxburgh |
| SLK | Selkirk |
| STG | Stirling |
| STH | Sutherland |
| WGT | Wigtown |
| WLO | West Lothian |
| X | Unlocalised: not enough evidence to determine provenance, or evidence ambivalent |
| XAP | Unlocalised: Acts of Parliament, produced by the central government. |
| XDI | Unlocalised: diplomatic document (e.g. treaty between Scotland and England) |
| XLC | Unlocalisable local document; it may give an indication of having been written and / or sealed in a specific place, but the parties and witnesses are stated as belonging elsewhere, the supposition being that they met in the specific place - e.g. Edinburgh, Stirling - to make the agreement and / or sign or seal the document. |
| XST | Unlocalised: document produced by the central goverment (except for Acts of Parliament), e.g. Letters under the Signet. |