I can report this much...I know the mapping on Craigslist and I was able to get it to map mine.
I used my zIP Code and made sure it was posting and I made sure I enabled mapping feature. . Are you able to enter your correct ZIP Code?
Seriously, perhaps where you're looking it up on mapping software... your GPS software needs and update - or maybe all of the databases are just massed up and need correction?
Are you in a unincorporated area...rural?