Our network (Co-Mo Connect) publishes network rollout status and maps at http://usage.co-mo.coop:8080/signupstatus.php
Before here, we looked at WK&T (Kentucky/Tennessee) http://wktelecom.coop/ That looked promising as well.
It was some work to even find these two networks, then finding homes within the service area and trying to find out if they were eligible was the next challenge. Lots of Zillow searches. If the home is pre-wired, they'll probably advertise it as such in the listing. I think the sweet spot (in terms of value) is finding a property that is eligible but hasn't had an install yet. In our case that meant eye-balling the neighborhood maps at a house-by-house level.
To find similar networks in other parts of the US I would start with Zillow searches (for "fiber") or Google searches for state + fiber + rollout, state + co-op + fiber, or state + co-op + Calix. Calix is a popular FTTH equipment vendor. You could also check their (or other vendors) press releases, which they usually issue when they partner with a new co-op. See http://www.ftthcouncil.org/OurMembers
I wish there were a friendlier UX for this. Our search lasted about 2 months. If anyone is interested in my area, email me and I should be able to help by finding properties before they hit MLS, qualifying addresses with the contacts I've made at the service provider/installers, and of course just driving around. It would be fantastic to build a hacker community here.
They just started the rollout and iirc it should be done at least in the towns by next summer.
Rsfiber.com is the site to check out