Here's my general list of Sims worlds and where I headcanon them being around. It's basically somewhat based around what real life influences the world is based off of.
Mt. Komorebi is Japan, natch. Northern Japan to be precisce.
Sulani is likewise based off of the Pacific Islands.
Evergreen Harbor is right around Oregan and Portland. Initally I had Glimmerbrook around there but I decided to shuffle that considering, well, upcoming pack. Moonwood Mills is it's closest neighbor now.
San Myshuno is based around San Fransico, natch.
Del Sol Valley being LA.
Strangerville is based around Aridzona and all of those strange tales out in suspicious areas...
Oasis Springs...is likely within the same region but somewhere more...upscale. Then again, if Get to Work is anything, it also has it's own Science center but...I more envision it as an old Route 66 tourist town. Whatever the Sims version of that is.
Willow Creak and Magnolia Prominade are obviously one and the same and again, based in New Orleans. (Now if only it didn't have a snowy winter)
Newcrest has a similar vibe to Willow Creek but with those winters, I envison it more up north. I'm thinking similar to Chicago.
For Forgotten Hollow, I actually went to the whole nine yards to see what colonies were present around the time of it's proposed settelment. And you know what I'm thinking, with it's seasons? Canada.
Glimmerbrook is one I initally pulled around Evergreen Harbor, as stated but I have had relatives that I've visited in Upstate New York and Vermont and that's kinda more the idea I got off of that area. ...outside of secluded gated suburb...that has a roadside bar...we don't question it.
Brindelton Bay is based on the northeast coast of America so yep! That's where it be! Quite lovely, all told.
Henford-on-Bagley and Britechester are within close proxmity, being the British towns they are.
Windenburg is...somewhere in Sims Germany while Tartosa is out in Sims Mediterrian coast! (I envision Spain, personally)