I have come up with an encryption algorithm and I am looking for a place to possibly publish it. Any ideas?
First, and I know this isn't exactly the answer you're seeking, but I'd mull over it for a while. Hopefully you have read Schneier's Memo to the Amateur Cipher Designer; it speaks the truth.
In short, before you try to go the route of publishing your algorithm, here are some things you should consider:
That said, you might already have considered all of these things and more, in which case I apologize profusely. Supposing you have, where can you publish it?
If you're more amateurish and looking for general community input, I'd pick somewhere like the /r/crypto subreddit and maybe try to hang around some other crypto-related spots on the web. If you're related with a university in some way, you might be able to track down cryptology researchers at yours, depending on your position and so forth.
If you're talking about more prestigious academia-related spots, I'd go with one of the IACR publications, where a great deal of cryptography papers are published. For general preprint hosting, almost all papers are submitted (at some point or another) to the Cryptology ePrint Archive, also ran by IACR. If you're familiar with academia, this is an arXiv-esque site for cryptology specifically.