Here is the latest and only current site that I know of where they are working toward keeping a current directory of house churches.
This is how they describe their directory:
This new national house church directory site offers:
1) Easy, self-serve listing functionality,
2) The ability to search using Google mapping, and
3) Private, secure communication between those listing a house church and people searching for one.
This site is completely free - no cost to use and no advertising clutter. We are just trying to help the house church community get connected.
I encourage you to make use of this and, also, let me know your experiences with it.