Here's a (slightly outdated) list available on another website:

Goodies:

01-05 kobold warrens (kobolds,tough kobolds)
01-10 graveyard (skeletons, graverobbers, zombies, ghouls, banshees)
05-10 violet woodland (gibberlings)
05-10 goblin village (children, males, females, guards, orcs)
05-10 west dairen road (turkeys)
05-10 forest of prosimy (wolves)
05-20 forest of nowhere (beasts,slugs,angnos,laxians,stalkers,taglos,burners)
10-15 misty mountains (orcs)
10-20 ashes of nowhere (beasts,lumberjacks,burners)
15-20 azreth wood (taglos, female tresnores, male tresnores)
15-20 tabershaw's keep (wyverns)
15-20 ruined keep (guards)
20-25 hidden forest (lesser trolls, greater trolls)
20-25 tower of sorcery (evil mages)
20-30 chessmaster tower (black pawns, black rooks)
25-30 velkyn oloth (guards)
25-35 keep of ceawlin (guards)
25-35 talshidar caves (talshidar)
25-35 drogran hills (ugruks)
25-45 arial city (prisoners, guards, soldiers, dark guards)
30-35 mount kiadana-rah (fire giants)
30-35 frigid wasteland (frost giants)
30-35 mausoleum (juju zombies)
30-35 crystal island (guards)
30-35 dranettie wood (owlbears)
30-40 mines of zakiim (arial miners)
30-40 elemental temple (acolytes)
30-40 keep of barovia (skeletons, zombies)
35-45 drow city (warrior students)
35-45 village of mal'trakis (headhunters)
35-45 organia (various)
40-51 aridhol (trollocs, myrddraal, footmen, horsemen, archers, pikemen)
40-51 shadar logoth (trollocs, myrddraal, footmen, horsemen, archers, pikemen)
40-51 arboria (thief lich guildmaster)
40-51 ruins of the deep (sahuagin)
40-51 mount calandaryl (skeletons)
40-51 thar-acacia (evil mages)
40-51 pine forest (dire wolves)
45-51 slave mines of sitran (slavers)

Unverified Goodies:

01-15 troglodyte caverns (troglodytes)
10-20 temple of loch grynmear (demons)
30-40 dra'melkhur (devouts, protectors)
35-45 northern mountains (udgaard patrollers)


Baddies:

01-05 copeham inn (twins, servants, locals, regulars)
01-10 graveyard (mourners, gravediggers, ghosts)
01-10 aldevari (men, women, girls, boys, guards, hunters)
05-10 west dairen road (turkeys)
05-10 vale of arendyl (cooshees, wilders, scouts, sentries, elders)
10-15 balator (orphans)
10-15 ysigrath (k'sra villagers, k'sra hunters)
10-15 south dairien settlement (sentries)
10-20 keep of the righteous (guards, students)
10-20 forest of nowhere (various sized forest guardians)
15-20 keep of ceawlin (servants, prisoners)
15-20 outlying villages (unknown)
15-20 tir-talath (mages, shoppies, militiamen)
15-30 emerald forest (pixies, sprites, brownies, dryads, nymphs, rangers)
20-25 akan (shoppies)
20-25 eryn galen (citizens, guards)
20-25 aturi (shoppies)
20-30 moudrilar's monestary (monks)
20-30 chessmaster tower (white pawns, white rooks)
25-30 castle of akan (servants, workers)
25-30 darsylon (shoppies)
25-30 arkham (guards)
25-30 jade mountains (jade elves)
25-30 halfling lands (shoppies)
25-35 eregion (feasting elves, elven guards)
30-35 arial city (guards, soldiers)
30-35 dranettie wood (dranetties)
30-40 battlefield (feared swordmen, large guards)
35-40 basillica (knights)
40-45 organia (various)
40-45 blingdenstone (citizens)
40-51 aridhol (footmen, horsemen, archers, pikemen)
40-51 mount kiadana-rah (storm giants)
40-51 ruins of the deep (silver spirits)
40-51 thar-acacia (good mages)
40-51 pine forest (elk, deer, etc.)

Unverified Baddies:

01-15 troglodyte caverns (troglodytes)
10-20 temple of loch grynmear (monks)