Morrowind:Permanent Corpses

Permanent Corpses
 
Permanent Corpses (sometimes known as Perma Corpses) are corpses that don't have the "Dispose of Corpse" option.  Consequently, the corpse will never disappear (unless it is caused by a scripted event). A corpse can hold an infinite amount of weight (same as your body inventory), and so is excellent for storage. Also, a permanent corpse will never reset or delete items. Permanent Corpses were made (for whatever reasons) when the developers checked the "corpses persist" box in the Construction Set.

Already Dead Creatures
Bull Netch (2) - north of Gnaar Mok 
Dead Guar - southwest of the Andasreth stronghold 
Dead Rat - next to the Marandus stronghold
Dead Rat - Punammu - between Pelagiad and the Dren Plantation 
Dead Rat (2) - Shishara - south and a little east of Ghostgate 
Dead Scamp (2) - Assurnabitashpi, Shrine - west of the Urshilaku Camp 
Dead Scamp (3) - Bal Fell, Outer Shrine 
Dead Scamp - Dubdilla, Uncharted Caverns, Lower - northeast of the Zainab Camp 
Dead Scamp - Ibar-Dad - west of the Urshilaku Camp 
Ettiene of Glenmoril Wyrd  - Altar of Thrond - only shows up when you start the quest to cure your Lycanthropy 
Hive Scrib (6) - Bthuand - southwest of the Rotheran stronghold 
Sphere Centurion - Gnisis, Bethamez - accessed through the Gnisis Egg Mine 
Sphere Centurion - Nchuleftingth, Lower Levels - south of Tel Uvirith which is west of Tel Fyr 
Steam Centurion - Gnisis, Bethamez - accessed through the Gnisis Egg Mine 
Steam Centurion - Mournhold, Ignatius Flaccus House 
Verminous Fabricant  - Sotha Sil, Outer Flooded Halls

Alive Creatures
Dahrk Mezalf - Bthungthumz - northwest of Maar Gan in the Foyada Bani-Dad 
Khash-Ti Dhrur  - Norenen-dur, Citadel of Myn Dhrur
Lord Dregas Volar - Magas Volar - you can only get there using the amulet found in the small chest next to Divayth Fyr in Tel Fyr 
Riekling  - east of the Tree Stone 
Skeleton Champion (2) - Sandas Ancestral Tomb - south of the Marandus stronghold 
The Udyrfrykte  - Solstheim, Lair of the Udyrfrykte - only shows up once you start the quest with Thirsk 
Variner's Ghost  - Old Mournhold: Temple Sewers

Skeletal Corpses
These are actual creatures with the name "Skeletal Corpse". These are not the same as the skeleton corpses you find in grottos, ancestral tombs, or other similar places (those are classified as containers).

Assumanu - southeast of Ald Redaynia, on the same island 
Tel Fyr, Corprusarium 
Tel Fyr, Corprusarium Bowels 
Endusal, Kagrenac's Study - southwest of Dagoth Ur's Citadel 
Kogoruhn, Nabith Waterway (3) - right next to Falasmaryon, north and a bit east of Maar Gan 
Mamaea, Sanctum of Awakening - east of Berandas south of Gnisis 
Mamaea, Shrine of Pitted Dreams (2) - east of Berandas, south of Gnisis 
Odrosal, Dwemer Training Academy - south and a bit east of Dagoth Ur's Citadel 
Tureynulal, Kagrenac's Library - northeast of Dagoth Ur's Citadel 
Urshilaku Camp, Astral Burial - south and a bit east of the Urshilaku Camp 
Vemynal, Outer Fortress - northwest of Dagoth Ur's Citadel

Already Dead NPCs
Aditte Oges - Shishi - west of Falasmaryon in the Foyada Bani-Dad 
Amring - Shishi - west of Falasmaryon in the Foyada Bani-Dad 
Anes Vendu - Nchuleftingth, Lower Levels - south of Tel Uvirith which is west of Tel Fyr 
Arlowe - Mabrigash Camp Ashamanu, on the small island west of Tel Aruhn. 
Ashamanu - northwest of Tel Vos, near the entrance to Sanit, part of the Dreams of a White Guar quest 
Asum - Rotheran, Arena 
Balyn Omavel - Balmora, Balyn Omavel's House - You need to do the daedric quest for Mephala for his corpse to show up here. Killing his normal form won't give you a perma corpse. 
Captain Roberto Jodoin - near the crashed Patchwork Airship northwest of the Altar of Thrond 
Celegil - Shishi - west of Falasmaryon in the Foyada Bani-Dad 
Danders - Nerano Ancestral Tomb - West of Tel Vos on the west side of a hill 
Elberoth - by the shipwreck northwest of Raven Rock 
Ernil Omoran - under the stone arch north of Balmora 
Farare Othril - Odirniran - west of Azura's Shrine 
Feril Salmyn's Corpse - outside of Kogoruhn - west of the Falasmaryon stronghold 
Francois Marquardt - on the crashed Patchwork Airship northwest of the Altar of Thrond 
Indrel - Shishi - west of Falasmaryon in the Foyada Bani-Dad 
Irer Nervion - Falasmaryon, Lower Level 
Jonis - Indaren Ancestral Tomb - southwest of the Rotheran stronghold
Lanie Endre - Shishi - west of Falasmaryon in the Foyada Bani-Dad 
M'nashi - outside Uncle Sweetshare's Workshop
Manabi Virith - near the crashed Patchwork Airship northwest of the Altar of Thrond 
Manolos Virith - near the crashed Patchwork Airship northwest of the Altar of Thrond 
Mansilamat Vabdas - Gnisis Eggmine, Underground stream. 
Marielle Amedee - Shishi - west of Falasmaryon in the Foyada Bani-Dad 
Mendel Eves - Tureynulal, Bladder of Clovis - northeast of Dagoth Ur 
Methas Hlaalu - Balmora, Morag Tong Guildhall - his body is hidden behind a few heavily locked doors 
Moris - Nerano Ancestral Tomb - west of Tel Vos, on the western side of the hill 
Nads Tharen - Vivec, St. Delyn Canal South-Two 
Nelix Fly-Breath - Dralas Ancestral Tomb - north and a little west of the Rotheran stronghold 
Processus Vitellius - just outside Seyda Neen to the northwest, near the water 
Ralen Hlaalo - Balmora, Hlaalo Manor 
Recently Slain Knight - Baram Ancestral Tomb - on the island north of Tel Aruhn 
Redoran Guard - Ald'ruhn, Sarethi Manor - after a House Redoran quest, there are two guards dead in the manor. Before that, the guard is normal and will respawn. 
Ruran Stoine - Mallapi - northeast of Gnaar Mok 
Ship Captain - Prelude Shipwreck, Lower Level - on a small island east of Bal Fell 
Swims-In-Swells - this Argonian is dead on a rock along the coast to the southeast of Uncle Sweetshare's Workshop 
Talmsa Falas - Odirniran - west of Azura's Shrine 
Urjorad - Ashalmimilkala, Shrine - west of the Hlormaren stronghold 
Ursine - Nerano Ancestral Tomb - west of Tel Vos, on the western side of the hill 
Viciously clawed dead smuggler - outside of Palansour - south of Ald Velothi 
Voruse Bethrimo - Dagoth Ur, Inner Tower

Alive NPCs
Ahaz - Ashkhan's Yurt, Erabenimsun Camp 
Alven Salas - Sadrith Mora, Morag Tong Guild Hall 
Andrelheim* - Thirsk 
Apronia Alfena - She's by the shipwreck along the coast northwest of Raven Rock. After the quest she follows you to the colony 
Ashu-Ahhe - Erabenimsun Camp, Ashu-Ahhe's Yurt 
Bereditte Jastal - Thirsk - when he is outside after the attack, his corpse is not permanent 
Berengeval - Sadrith Mora, Tel Naga Living Quarters 
Bergljot* - Thirsk 
Black Dart Gilur - Old Mournhold: Temple Sewers West 
Brandr - standing by the river south of the Skaal Village 
Brynjolfr - in his hut behind Thirsk 
Divayth Fyr - Tel Fyr 
Duke Vedam Dren - Ebonheart, Grand Council Chambers 
Durgash gro-Rushub -Ashurnibibi, Shrine - northwest of Hla Oad 
Erich the Unworthy* - Thirsk 
Erna the Quiet - standing by the river south of the Skaal Village 
Ettiene of Glenmoril Wyrd - her location depends on your progress with your cure for lycanthropy 
Fallaise of Glenmoril Wyrd - Gloomy Cave - north of Brodir Grove (only shows if you are using the witches to cure your lycanthropy) 
Gals Arethi - on his ship in the port of Sadrith Mora 
Galtis Guvron - Ald'ruhn, The Rat in the Pot 
Geilir the Mumbling - Solstheim, Geilir the Mumbling's Dwelling - south of Thormoor's Watch 
Goris the Maggot King - Venim Ancestral Tomb - north of the Zainab Camp 
Ingmar - initially outside the Valbrandr Barrow, in his house in the Skaal Village after you help him - Valbrandr Barrow is south of Uncle Sweetshare's Workshop
Isobel of Glenmoril Wyrd - Gloomy Cave - north of Brodir Grove (only shows if you are using the witches to cure your lycanthropy) 
Jeleen - Fort Frostmoth, Imperial Cult Shrine 
Karrod - Mournhold, Royal Palace Throne Room 
Kjolver - Solstheim, Kjolver's Dwelling - northwest of Brodir Grove 
Kolfinna - Solstheim, Kolfinna's Dwelling- north of Fort Frostmoth, along the river 
Lassnr - Skaal Village, Lassnr's House 
Louis Beauchamp - outside the Ald'ruhn Mages Guild 
Luven - Venim Ancestral Tomb - north of the Zainab Camp 
Mirisa* - Thirsk 
Novor Drethan - Dissapla Mine - just northeast of Falensarano 
Olfeigr the Fair* - Thirsk 
Ranabi - Erabenimsun Camp, Ranabi's Yurt 
Remasa Othril - Odirniran - west of Azura's Shrine 
Skjoldr Wolf-Runner* - Thirsk 
Sterdecan - by his farmhouse - northwest of Suran 
Svenja Snow-Song* - Thirsk - when she is outside after the attack, her corpse is not permanent 
Tharsten Heart-Fang - his corpse is only permanent at the end of the Bloodmoon Main Quest 
Thormoor Gray-Wave - Thormoor's Watch, then he is in Thirsk after you help him - his corpse is permanent no matter where he is 
Tymvaul - Solstheim, Rimhull - south of Thirsk - if you don't end up killing him, he ends up at Lasnnr's Houe in the Skaal Village and is still a permanent corpse 
Ulath-Pal - Erabenimsun Camp, Ashkan's Yurt 
Ulfgar the Unending - Solstheim, Ulfgar the Unending's Dwelling - right near Brodir Grove 
Ulfrun* - Thirsk 
Uncle Sweetshare - Uncle Sweetshare's Shop - south of Thirsk and east of Brodir Grove

Unnamed Dead Body NPCs
There are many corpses named simply Dead Body, Dead Hero, Dead Adventurer, etc.  The list below details the locations.

Dead Adventurers

Bthuand - southwest of the Rotheran stronghold 
Dagoth Ur, Inner Facility 
Ilanipu Grotto (2) - south of the Rotheran Stronghold 
Ilunibi, Carcass of the Saint - northwest of Gnaar Mok and south of the Andasreth stronghold 
Ilunibi, Marowak's Spine - northwest of Gnaar Mok and south of the Andasreth stronghold 
Ilunibi, Tainted Marrow - northwest of Gnaar Mok and south of the Andasreth stronghold 
Koal Cave - south of Gnisis 
Madas-Zebba Egg Mine - west of Dagon Fel 
Maelu Egg Mine - west of the Falensarano stronghold 
Molag Mar, Underworks 
Nimawia Grotto - northwest of Seyda Neen 
Panabanit-Nimawia Egg Mine - northwest of Ghostgate, inside the Ghostfence 
Pudai Egg Mine - west of Dagon Fel, but on the same island 
Sarimisun-Assa Egg Mine - north of the Andasreth stronghold 
Solstheim, Connorflenge Barrow (2) - east of Uncle Sweetshare's shop, along the coast 
Solstheim, Kelsedolk Barrow (2) - on the peninsula southwest of Raven Rock 
Urshilaku Burial Caverns, Astral Burial - between the Urshilaku Camp and the Falasmaryon stronghold 
Urshilaku Burial Caverns, Fragile Burial - between the Urshilaku Camp and the Falasmaryon stronghold 
Urshilaku Burial Caverns, Kakuna Burial - between the Urshilaku Camp and the Falasmaryon stronghold 
Urshilaku Burial Caverns, Kefka Burial - between the Urshilaku Camp and the Falasmaryon stronghold 
Urshilaku Burial Caverns, Karma Burial - between the Urshilaku Camp and the Falasmaryon stronghold

Dead Body

Ald Redaynia, Tower (2) - on the long skinny island west of Dagon Fel 
Andrano Ancestral Tomb - south and a little west of Pelagiad 
Beran Ancestral Tomb - south and a little east of Tel Branora 
Berandas, Underground 
Koal Cave - south of Gnisis 
Maren Ancestral Tomb - southwest of the Erabenimsun Camp 
Mawia - on the island southeast of Molag Mar 
Missamsi - northeast of Moonmoth Legion Fort, over the Foyada 
Ravel Ancestral Tomb - north of Azura's Shrine 
Rissun - on the very small island, two islands east of Bal Fell 
Sadryon Ancestral Tomb - north of Sadrith Mora 
Sandus Ancestral Tomb - northwest of the Falensarano stronghold 
Subdun - southwest of Berandas 
Tel Branora, Tower Dungeon 
Tel Uvirith, Tower Dungeon - west of Tel Fyr 
Vas, Tower - small island west of Dagon Fel 
Verelnim Ancestral Tomb - two islands south of Sadrith Mora 
Vivec, Arena Underworks 
Vivec, Foreign Quarter Underworks

Dead Dreamer

Odrosal, Dwemer Training Academy (3) - southeast of Dagoth Ur

Dead Egg Miner

Eluba-Addon Egg Mine - on the peninsula far southwest of Ald Velothi 
Matus-Akin Egg Mine (2) - northwest of the Shrine to Azura 
Matus-Akin Egg Mine, Queen's Lair (2) - northwest of Azura's Shrine 
Panabanit-Nimawia Egg Mine - northwest of Ghostgate, inside the Ghostfence 
Sinamusa Egg Mine - west of the Ahemmusa Camp 

Dead Elite Ordinator

Ald Daedroth, Antechammber - north of the Ahemmusa Camp

Dead Hero

Berandas, Underground 
Dagoth Ur, Inner Facility 
Dagoth Ur, Lower Facility 
Endusal, Kagrenac's Study - southwest of Dagoth Ur 
Kogoruhn, Hall of Maki (3) - southeast of the Falasmaryon stronghold 
Maesa-Shammus Egg Mine - northeast of Molag Mar 

Dead Ordinator

Assemanu (3) - southeast of Seyda Neen

Dead Smuggler

Palansour (2) - south of Ald Velothi

Dead Warlock

Ald Daedroth, Antechamber - north of the Ahemmusa Camp

Notes
The bodies in Thirsk will disappear once you leave after you accept the quest to take care of the Udyrfrykte.
For those NPCs and Creatures that are not already dead, you can Command them to any place you want and kill them there for instant infinite storage (exceptions are pointed out).