| RHP2775 | Bound Ordnance Survey 6 inch plans (5) showing estates abutting on the River Wick | 1907 |
| RHP2798 | Plan of the county of Caithness showing railways in operation and projected. | nd |
| RHP2950 | Bound Ordnance Survey 6 inch plans of part of the coast of the county of Caithness showing salmon fishings. | 1911 |
| RHP3045 | Map of the County of Caithness showing railways | nd |
| RHP8701 | Ordnance Survey 1/2 inch index map. Electoral divisions. Caithness | 1889 |
| RHP11781 | Plan of Caithness. | 1822 |
| RHP17441 | Ordnance Survey 1 inch map (sheet 116) marked to show various branches of the Highland Railway. | 1878 |
| RHP17442 | Ordnance Survey 6 inch plan (sheet 117) marked to show various branches of the Highland Railway. | 1878 |
| RHP20885 | Map of the county of Caithness | Mid 19th century |
| RHP27207 | Ordnance Survey plan marked to show various lines of the London Midland and Scottish Railway in the counties of Ross and Cromarty, Sutherland, Caithness with reference to the Scottish Highland Electricity (Extension) Special Order. | 1937 |
| RHP34160 | Admiralty chart of north coast from Thurso Bay to North Minch. (Vignettes of north coast from Sisters to Cape Wrath and from Griam Beg to Cape Wrath) | 1900 |
| RHP34171 | Admiralty chart of coasts of Caithness and Sutherland, Orkney and Shetland, with insets of Hillswick, Balta Sound, Scalloway, Lerwick, Pierowall, Eynhallow, North Ronaldsay Firth, Hoy Sound, Kirkwall, Deer Sound, Pentland Firth, Scrabster Road, Wick and Loch Eriboll. | 1905 |
| RHP34173 | Admiralty chart of east coast from Dunbeath Harbour to Thurso Bay, with Pentland Firth. | 1905 |
| RHP38122 | Map of the county of Caithness | nd |
| RHP38311/1 | L.M.S. Railway, Northern Section: Gradient profiles, stations etc. | 1937 |
| RHP39013 | Ministry of Transport 1//4" road map (Wick and Thurso, sheet 7), marked to show constructional scheme no. 72 (North of Scotland Hydro Electric Board). | 1943 |
| RHP40703 | Admiralty chart of Pentland Firth and approaches. | 1958 |
| RHP43582 | 1 inch Ordnance Survey map of Caithness marked to indicate locations of schools. | 1900 |
| RHP43583 | Architectural plan, section and elevation of two storey dwelling-house. | [early 20th century] |
| RHP43604 | 1. Bound plans and sections (with book of reference and gazette notice attached) of Caithness Railways line from Thurso to Wick via Castletown. 2. Duplicate of no 1 | 1865 |
| RHP43605 | 1. Bound plans and sections (with book of reference attached) of Caithness Railways line from Thurso to Wick via Castletown. 2-3. Duplicate of no 1 (book of reference separate) | 1870 |
| RHP43606 | 1. Bound plans and sections of Sutherland and Caithness Railway line from Helmsdale to Wick with branch to Thurso. 2. Book of reference 3. Letter 4-5. Duplicates of nos 1-2 | 1870 |
| RHP43607 | 1. Bound plans and sections of deviations of the Sutherland and Caithness Railway line from Helmsdale to Wick and branch to Thurso. 2. Book of reference | 1875 |
| RHP43609 | 'New Business Map' of Ross and Cromarty, Sutherland and Caithness with plans of burghs inset, showing locations of polling stations and carrying motor and other retail trade advertisements. | 1920 |
| RHP45142 | Gradient profile of main line, Inverness to Wick [London Midland and Scottish Railway]. | 1923 |
| RHP47600 | Bound plans and sections of Sutherland and Caithness Railway deviations and alterations to line between Helmsdale River and Wick | Nov 1875 |
| RHP48669 | Gradient profile and diagram of line: Wick to Helmsdale, with insets of Wick Station and Georgemas Station [London Midland and Scottish Railway] | 1923 |
| RHP90343 | Development Plan (Milton) Designation Map | 20 Oct 1954-10 Apr 1956 |
| RHP90344 | Certified Copy of RHP90343 | |
| RHP90345 | Part Development Plan No.3 County Map, Certified Copy | 29 Sep 1964-29 Oct 1965 |
| RHP90346 | Part Development Plan No.3 County Programme Map, Certified Copy | 29 Sep 1964-29 Oct 1965 |
| RHP90347 | County Part Plan Designation Map 2, Certified Copy | 29 Sep 1964-29 Oct 1965 |
| RHP90348 | Thurso Programme Map, Certified Copy | 5 Dec 1957-8 Mar 1961 |
| RHP90349 | Copy of RHP90348 | |
| RHP90350 | Thurso Programme Map | nd. |
| RHP90351 | Copy of RHP90350 | |
| RHP90352 | Copy of RHP90350 | |
| RHP90353 | Thurso Modification Map, Certified Copy | 8 Mar 1961 |
| RHP90354 | Thurso Town Map | 16 May 1958 |
| RHP90355 | Copy of RHP90354 | |
| RHP90356 | Thurso Town Map | nd. |
| RHP90357 | Copy of RHP90356 | |
| RHP90358 | Copy of RHP90356 | |
| RHP90359 | Copy of RHP90356 | |
| RHP90360 | Thurso Amendment to Town Map No.1, Certified Copy | 12 Jun 1961-28 Dec 1961 |
| RHP90361 | Thurso Amendment to Programme Map No.1, Certified Copy | 12 Jun 1961-28 Dec 1961 |
| RHP90362 | Thurso Designation Map No.1, Certified Copy | 9 Jul 1959-8 Mar 1961 |
| RHP90363 | Thurso Designation Map Nos.2 & 3, Certified Copy | 9 Jul 1959 |
| RHP90364 | Thurso Development Plan Amendment Map No.4, Certified Copy | 17 Jan 1969-25 Jun 1969 |
| RHP90365 | Thurso Plan to Accompany Report dated 2 Apr 1965 | |
| RHP90366 | Thurso Plan to Accompany Report dated 2 Apr 1965 | |
| RHP90367 | Thurso Development Plan | nd. |
| RHP90368 | Copy of RHP90367 | |
| RHP90369 | Copy of RHP90367 | |
| RHP90370 | Wick Burgh and District Part Plan Comprehensive Development Area Map | 16 Mar 1965-14 Jun 1965 |
| RHP90371 | Wick Burgh and District Part Plan Town Map Programme Map | 29 Jan 1964-14 Jun 1965 |
| RHP90372 | Wick Burgh and District Part Plan Comprehensive Development Area Programme Map | 16 Mar 1965-14 Jun 1965 |
| RHP90373 | Wick Burgh and District Quinquennial Review Modification Map | 14 Jun 1965 |
| RHP90374 | Castletown Part Development Plan No.2 Comprehensive Development Area Map | 16 Mar 1959-11 Feb 1960 |
| RHP90375 | Castletown Part Development Plan No.2 Programme Map | 16 Mar 1959-11 Feb 1960 |
| RHP90376 | Castletown Part Development Plan No.2 Designation Map | 16 Mar 1959-11 Feb 1960 |
| RHP90377 | Castletown Part Development Plan No.2 Modification Map | 11 Feb 1960 |
| RHP90378 | Castletown Part Development Plan No.2 Test Map | Aug 1958-16 Mar 1959 |
| RHP90379 | County Part Plan Designation Map 2 | 29 Sep 1964-29 Oct 1965 |
| RHP90380 | County Part Plan Designation Map 2 | 29 Sep 1964 |
| RHP90381 | Wick Burgh and District Part Plan Programme Map | 20 Oct 1954-10 Apr 1956 |
| RHP90382 | Wick Burgh and District Part Plan Comprehensive Development Area Programme Map | 16 Mar 1965 |
| RHP90383 | Wick Burgh and District Part Plan Comprehensive Area Map | 16 Mar 1965 |
| RHP90384 | Wick Burgh and District Part Plan Designation Map | 29 Jan 1954-14 Jun 1965 |
| RHP90385 | Wick Burgh and District Quinquennial Review Modification Map | 14 Jun 1965 |
| RHP90386 | Wick Burgh and District Part Plan Modification Map 1 | 10 Apr 1956 |
| RHP90387 | Copy of RHP90386 | |
| RHP90388 | Wick Burgh and District Part Plan Town Map | 20 Oct 1954-10 Apr 1956 |
| RHP90389 | Wick Burgh and District Part Plan Revision No.1, 1962 Town Map | 29 Jan 1963-14 Jun 1965 |
| RHP90390 | Part Development Plan County Map | 29 Sep 1964-29 Oct 1965 |
| RHP90391 | Part Development Plan County Programme Map | 29 Sep 1964-29 Oct 1965 |
| RHP90392 | County of Caithness and Burgh of Thurso Areas of Great Landscape Value and Tourist Development Proposals Map | 22 Jul 1969-24 Apr 1970 |
| RHP90393 | Supporting Papers (1-22) (Written Statements, Survey Reports, Development Plans, Amendments, Letters) | 1953-1974 |
| RHP92119 | Modification Map | 8 Mar 1961 |
| RHP92120 | Designation Map Nos.2 & 3 | 9 Jul 1959 |
| RHP92121 | Town Map | 5 Dec 1957-8 Mar 1961 |
| RHP92122 | Programme Map | 5 Dec 1957-8 Mar 1961 |
| RHP92123 | Modification Map No.1 | 9 Jul 1959-8 Mar 1961 |
| RHP92124 | Survey Analysis | nd. |
| RHP92125 | Oldfield Mains Development Plan Amendment No.1, Town Map | 12 Jun 1961-28 Dec 1961 |
| RHP92126 | Oldfield Mains Development Plan Amendment No.1, Programme Map | 12 Jun 1961-28 Dec 1961 |
| RHP92127 | Amendment Map No.4 | 17 Jan 1969-25 Jun 1969 |
| RHP92128 | Comprehensive Development Area Map | 20 Dec 1967-20 Mar 1969 |
| RHP92129 | Comprehensive Development Area Designation Map | 20 Dec 1967-20 Mar 1969 |
| RHP92130 | Amendment Map No.5 | 6 Mar 1974-10 Jun 1974 |
| RHP92131 | Copy of RHP92130 | |
| RHP92132 | Supporting Papers (1-10) (Survey Report, Amendments, Written Statement) | 1959-1974 |
| RHP92510 | Ordnance Survey 1/2500 plan (Caithness, sheet VI.9) (Map No.1) marked to show Olrig Estate | c 1960-1980 |
| RHP92511 | Ordnance Survey 1/2500 plan (Caithness, sheet VI.10) (Map No.2) marked to show Olrig Estate | c 1960-1980 |
| RHP92512 | Ordnance Survey 1/2500 plan (Caithness, sheet VI.13) (Map No.3) marked to show Olrig Estate | c 1960-1980 |
| RHP92513 | Ordnance Survey 1/2500 plan (Caithness, sheet VI.14) (Map No.4) marked to show Olrig Estate | c 1960-1980 |
| RHP92514 | Ordnance Survey 1/2500 plan (Caithness, sheet XII.1) (Map No.5) marked to show Olrig Estate | c 1960-1980 |
| RHP92515 | Ordnance Survey 1/2500 plan (Caithness, sheet XII.2) (Map No.6) marked to show Olrig Estate | c 1960-1980 |
| RHP92516 | Ordnance Survey 1/2500 plan (Caithness, sheet XII.3) (Map No.7) marked to show Olrig Estate | c 1960-1980 |
| RHP92517 | Ordnance Survey 1/2500 plan (Caithness, sheet XII.5) (Map No.8) marked to show Olrig Estate | c 1960-1980 |
| RHP92518 | Ordnance Survey 1/2500 plan (Caithness, sheet XII.6) (Map No.9) marked to show Olrig Estate | c 1960-1980 |
| RHP92519 | Ordnance Survey 1/2500 plan (Caithness, sheet XII.7) (Map No.10) marked to show Olrig Estate | c 1960-1980 |
| RHP92520 | Ordnance Survey 1/2500 plan (Caithness, sheet V.6) marked to show Scrabster Estate | c 1960-1980 |
| RHP92521 | Ordnance Survey 1/2500 plan (Caithness, sheet XI.10) (Map No.1) marked to show Scotscalder and Dorrery Estate | c 1960-1980 |
| RHP92522 | Ordnance Survey 1/2500 plan (Caithness, sheet XI.11) (Map No.2) marked to show Scotscalder and Dorrery Estate | c 1960-1980 |
| RHP92523 | Ordnance Survey 1/2500 plan (Caithness, sheet XI.13) (Map No.3) marked to show Scotscalder and Dorrery Estate | c 1960-1980 |
| RHP92524 | Ordnance Survey 1/2500 plan (Caithness, sheet XI.14) (Map No.4) marked to show Scotscalder and Dorrery Estate | c 1960-1980 |
| RHP92525 | Ordnance Survey 1/2500 plan (Caithness, sheet XI.15) (Map No.5) marked to show Scotscalder and Dorrery Estate | c 1960-1980 |
| RHP92526 | Ordnance Survey 1/2500 plan (Caithness, sheet XVII.2) (Map No.6) marked to show Scotscalder and Dorrery Estate | c 1960-1980 |
| RHP92527 | Ordnance Survey 1/2500 plan (Caithness, sheet XVII.3) (Map No.7) marked to show Scotscalder and Dorrery Estate | c 1960-1980 |
| RHP92528 | Ordnance Survey 1/2500 plan (Caithness, sheet XVII.5) (Map No.8) marked to show Scotscalder and Dorrery Estate | c 1960-1980 |
| RHP92529 | Ordnance Survey 1/2500 plan (Caithness, sheet XVII.6) (Map No.9) marked to show Scotscalder and Dorrery Estate | c 1960-1980 |
| RHP92530 | Ordnance Survey 1/2500 plan (Caithness, sheet XVII.7) (Map No.10) marked to show Scotscalder and Dorrery Estate | c 1960-1980 |
| RHP92531 | Ordnance Survey 1/2500 plan (Caithness, sheet XVII.9) (Map No.11) marked to show Scotscalder and Dorrery Estate | c 1960-1980 |
| RHP92532 | Ordnance Survey 1/2500 plan (Caithness, sheet XVII.10) (Map No.12) marked to show Scotscalder and Dorrery Estate | c 1960-1980 |
| RHP92533 | Ordnance Survey 1/2500 plan (Caithness, sheet XVII.11) (Map No.13) marked to show Scotscalder and Dorrery Estate | c 1960-1980 |
| RHP92534 | Ordnance Survey 1/2500 plan (Caithness, sheet XVI.16) (Map No.14) marked to show Scotscalder and Dorrery Estate | c 1960-1980 |
| RHP92535 | Ordnance Survey 1/2500 plan (Caithness, sheet XVII.13) (Map No.15) marked to show Scotscalder and Dorrery Estate | c 1960-1980 |
| RHP92536 | Ordnance Survey 1/2500 plan (Caithness, sheet XVII.14) (Map No.16) marked to show Scotscalder and Dorrery Estate | c 1960-1980 |
| RHP92537 | Ordnance Survey 1/2500 plan (Caithness, sheet XVII.15) (Map No.17) marked to show Scotscalder and Dorrery Estate | c 1960-1980 |
| RHP92538 | Ordnance Survey 1/2500 plan (Caithness, sheet XXI) (Map No.18) marked to show Scotscalder and Dorrery Estate | c 1960-1980 |
| RHP92539 | Ordnance Survey 1/2500 plan (Caithness, sheet XXII) (Map No.19) marked to show Scotscalder and Dorrery Estate | c 1960-1980 |
| RHP92540 | Ordnance Survey 1/2500 plan (Caithness, sheet IV.16) marked to show Stemster and Lythmore Estate | c 1960-1980 |
| RHP92541 | Ordnance Survey 1/2500 plan (Caithness, sheet V.13) marked to show Stemster and Lythmore Estate | c 1960-1980 |
| RHP92542 | Ordnance Survey 1/2500 plan (Caithness, sheet X.4) marked to show Stemster and Lythmore Estate | c 1960-1980 |
| RHP92543 | Ordnance Survey 1/2500 plan (Caithness, sheet XI.1) marked to show Stemster and Lythmore Estate | c 1960-1980 |
| RHP140137 | Plan of crossroads at Viewfield, Caithness | 1916 |
| RHP140787/3 | Sheet 3: Caithness, Sutherland, Ross & Cromarty (Mainland) | 1 Jan 1972 |
| RHP141503/53 | Map of Caithness | 1822 |
| RHP143000/3/22 | Ordnance Survey 1 inch map (Sheet 109, [Auchintoul]) | 1878 |
| RHP143000/3/29 | Ordnance Survey 1 inch map (Sheet 116, [Wick]) | 1878 |
| RHP143000/3/30 | Ordnance Survey 1 inch map (Sheet 117, [Hoy (Orkney)]) | 1886 |
| RHP143351/2 | Ordnance Survey 6 inch plans of Scotland: Caithness | 1890s |
| RHP143351/2/1 | Ordnance Survey 6 inch plan of Scotland: Caithness sheet I | 1890s |
| RHP143351/2/2 | Ordnance Survey 6 inch plan of Scotland: Caithness sheet II | 1890s |
| RHP143351/2/3 | Ordnance Survey 6 inch plan of Scotland: Caithness sheet III | 1890s |
| RHP143351/2/4 | Ordnance Survey 6 inch plan of Scotland: Caithness sheet IV | 1890s |
| RHP143351/2/5 | Ordnance Survey 6 inch plan of Scotland: Caithness sheet V | 1890s |
| RHP143351/2/6 | Ordnance Survey 6 inch plan of Scotland: Caithness sheet VI | 1890s |
| RHP143351/2/7 | Ordnance Survey 6 inch plan of Scotland: Caithness sheet VII | 1890s |
| RHP143351/2/8 | Ordnance Survey 6 inch plan of Scotland: Caithness sheet VIII | 1890s |
| RHP143351/2/9 | Ordnance Survey 6 inch plan of Scotland: Caithness sheet IX | 1890s |
| RHP143351/2/10 | Ordnance Survey 6 inch plan of Scotland: Caithness sheet X | 1890s |
| RHP143351/2/11 | Ordnance Survey 6 inch plan of Scotland: Caithness sheet XI | 1890s |
| RHP143351/2/12 | Ordnance Survey 6 inch plan of Scotland: Caithness sheet XII | 1890s |
| RHP143351/2/13 | Ordnance Survey 6 inch plan of Scotland: Caithness sheet XIII | 1890s |
| RHP143351/2/15 | Ordnance Survey 6 inch plan of Scotland: Caithness sheet XV | 1890s |
| RHP143351/2/16 | Ordnance Survey 6 inch plan of Scotland: Caithness sheet XVI | 1890s |
| RHP143351/2/17 | Ordnance Survey 6 inch plan of Scotland: Caithness sheet XVII | 1890s |
| RHP143351/2/18 | Ordnance Survey 6 inch plan of Scotland: Caithness sheet XVIII | 1890s |
| RHP143351/2/19 | Ordnance Survey 6 inch plan of Scotland: Caithness sheet XIX | 1890s |
| RHP143351/2/20 | Ordnance Survey 6 inch plan of Scotland: Caithness sheet XX | 1890s |
| RHP143351/2/21 | Ordnance Survey 6 inch plan of Scotland: Caithness sheet XXI | 1890s |
| RHP143351/2/22 | Ordnance Survey 6 inch plan of Scotland: Caithness sheet XXII | 1890s |
| RHP143351/2/23 | Ordnance Survey 6 inch plan of Scotland: Caithness sheet XXIII | 1890s |
| RHP143351/2/24 | Ordnance Survey 6 inch plan of Scotland: Caithness sheet XXIV | 1890s |
| RHP143351/2/25 | Ordnance Survey 6 inch plan of Scotland: Caithness sheet XXV | 1890s |
| RHP143351/2/26 | Ordnance Survey 6 inch plan of Scotland: Caithness sheet XXVI | 1890s |
| RHP143351/2/27 | Ordnance Survey 6 inch plan of Scotland: Caithness sheet XXVII | 1890s |
| RHP143351/2/28 | Ordnance Survey 6 inch plan of Scotland: Caithness sheet XXVIII | 1890s |
| RHP143351/2/29 | Ordnance Survey 6 inch plan of Scotland: Caithness sheet XXIX | 1890s |
| RHP143351/2/30 | Ordnance Survey 6 inch plan of Scotland: Caithness sheet XXX | 1890s |
| RHP143351/2/31 | Ordnance Survey 6 inch plans of Scotland: Caithness sheets XXXI and XXXIa | 1890s |
| RHP143351/2/31/1 | Ordnance Survey 6 inch plan of Scotland: Caithness sheet XXXI | 1890s |
| RHP143351/2/31/2 | Ordnance Survey 6 inch plan of Scotland: Caithness sheet XXXIa | 1890s |
| RHP143351/2/32 | Ordnance Survey 6 inch plan of Scotland: Caithness sheet XXXII | 1890s |
| RHP143351/2/33 | Ordnance Survey 6 inch plan of Scotland: Caithness sheet XXXIII | 1890s |
| RHP143351/2/34 | Ordnance Survey 6 inch plan of Scotland: Caithness sheet XXXIV | 1890s |
| RHP143351/2/36 | Ordnance Survey 6 inch plan of Scotland: Caithness sheet XXXVI | 1890s |
| RHP143351/2/37 | Ordnance Survey 6 inch plan of Scotland: Caithness sheet XXXVII and part of Sutherland sheet LXVII | 1890s |
| RHP143351/2/38 | Ordnance Survey 6 inch plan of Scotland: Caithness sheet XXXVIII | 1890s |
| RHP143351/2/39 | Ordnance Survey 6 inch plan of Scotland: Caithness sheet XXXIX | 1890s |
| RHP143351/2/41 | Ordnance Survey 6 inch plan of Scotland: Caithness sheet XLI | 1890s |
| RHP143351/2/42 | Ordnance Survey 6 inch plan of Scotland: Caithness sheet XLII | 1890s |
| RHP143351/2/44 | Ordnance Survey 6 inch plan of Scotland: Caithness sheet XLIV | 1890s |
| RHP143351/3/57 | Ordnance Survey 6 inch plan of Scotland: Sutherland sheet LVII and Caithness sheets XXXIa XXXI XXXVI and XXXVII | 1890s |
| RHP143351/3/67 | Ordnance Survey 6 inch plan of Scotland: Sutherland sheet LXVII and Caithness sheets XXXVI XXXVII and XLI | 1890s |
| RHP143351/4/101 | Ordnance Survey 6 inch plan of Scotland: Ross-shire (Sheet 101) | 1890s |