Vinyl's popularity has resulted in a mini surge of interest in vinyl pressing plants. For example, a vinyl pressing plant was used as a humorous backdrop for a Jack White Record Store Day promo video.
Detroit's Last Vinyl Pressing Plant
A recent piece on Vice's Motherboard on the shortage of vinyl pressing plants includes the above video and gathers together information from the last few years.
They tell a story of competitors buying failed pressing plants to gather parts to new plants opening that always have more orders than they can fill in a timely manner.
Given the limited supply of vinyl pressing plants, indie labels putting out vinyl may well be able to sort things out through word of mouth, online or off. But it would be nice to have an up-to-date list that would be updated in the future as well.
This is the most complete list I could find and it was last updated in 2012.
@Buzzsonic has a Vinyl Pressings Twitter list that features many currently active pressing plants but is limited to those with Twitter accounts.
These are the only two that also mentioned Polysom, a vinyl pressing plant in Brazil that was featured in Wax Poetics,