Today I’m going to focus on writing a story. Which will probably end up as a novelette or even a novella. Because that’s just how this shit works. I rarely have neat, 6,000-word ideas. I’m more a 12,000-words person. Or 20,000. Occasionally 2,000. But, trust me, this isn’t a 2,000-word idea.
So today, girls and boys, you’re on your own. Go watch the Olympics. Even better, go for a walk, then sit in the sun and read a book. Or pick one of the other dozen daily delights I’ve recommended. A little of what you fancy is good for you–a lot is even better…
Nicola Griffith 
What do you do with stories of 12k-20k words? How do you get them out to readers? The vast majority of the short story collections I have contain stories of (nearest I can estimate) the 5k-10k range.
It's a big concern for me because I have have yet to bring a second draft below 9k. Most of my stories are in the 9k-20k range as second/third drafts.
I sell them to editors. Then it's their job to get them out there. (Saves me a lot of fussing with cover design and interior design.) Plus, short fiction-wise my motto is Write it once, sell it four times. It turns out to be kind of cost effective :)
But I don't find it hard to sell my work because I write it so rarely. If I wrote a story a month it might be different.
Thank you, I'll keep that in mind. I try not to worry about it too much, instead wanting to focus on getting the work done, but some times it's hard not to be a little afraid that there might not be a market for short fiction on the longer end of the scale.
My hope is to put out a few short story collections in between novels, but I also want as much exposure as possible for my work before hand in anthologies.
I'm trying to do my best to have a good understanding of not just the actual story telling, but also of the publishing and business aspects of it all. I figure the more and better I understand things, the greater a chance I will have at building a rewarding career.
My pleasure–though frankly I don't think I'm up to speed the short fiction marketplace. It's not my usual playground.
But there are various online critique groups who would, I think, have lots of information to share if you joined.