Typically they're marketed under an identifiable naming scheme and the heroine's name. I'm going to give you titles from the first in the series, you can search on Amazon to find the rest.
Let's see: Dead Witch Watching (my first urban fantasy series and a decent one to get started on if you're new to the genre). Succubus Blues (an... amusing choice in a protagonist). Trick of the Light. Nice Girls Don't Have Fangs ("He vamped me against my will, comedy edition"). Some Girls Bite ("He vamped me against my will, drama edition" -- probably the quickest teach-you-the-tropes book on this list).
Let's see: Dead Witch Watching (my first urban fantasy series and a decent one to get started on if you're new to the genre). Succubus Blues (an... amusing choice in a protagonist). Trick of the Light. Nice Girls Don't Have Fangs ("He vamped me against my will, comedy edition"). Some Girls Bite ("He vamped me against my will, drama edition" -- probably the quickest teach-you-the-tropes book on this list).