Thanks to all who provided info.
Here's a list I've compiled, as of this evening, of plants confirmed to be producing vinyl records as of today. I could not confirm JTS, which another listmember provided. I have an e-mail inquiry in to them, to confirm they press records on-site.
CONFIRMED VINYL PRESSING PLANTS
RECORD TECHNOLOGY INC (RTI) - Camarillo, CA USA http://www.recordtech.com/
UNITED RECORD PRESSING - Nashville, TN USA http://www.urpressing.com/
RAINBO RECORDS - Canoga Park, CA USA http://www.rainborecords.com/vinyl.htm
MUSICOL RECORDING - Columbus, OH USA http://www.musicolrecording.com/vinyl/index.html
MMP - Neunkirchen-Seelscheid, GERMANY http://www.master-media.net/en/index.php
ERIKA RECORDS - Downey, CA USA http://www.erikarecords.com/
DYNAMIC SUN - Newark, NJ USA http://www.dynamicsun.com/
CURVED LTD - Hackney, London, UK http://www.curvedpressings.com/abou.htm
ZENITH RECORD PRESSING - Albion, Victory, AUSTRALIA http://www.zenithrecords.org/
ARCHER RECORD PRESSING - Detroit, MI USA http://www.archerrecordpressing.com/
BROOKLYNPHONO - Brooklyn, NY USA http://brooklynphono.com/
RECORD INDUSTRY - Haarlem, Netherlands http://www.recordindustry.com/
PORTALSPACE Records - Hayes, Middlesex UK http://www.portalspacerecords.com/da/13007
JTS VINYL AND CD MANUFACTURING - London, UK http://www.jtsstudio.co.uk/pages/manufacture.htm (UNCONFIRMED)
BILL SMITH CUSTOM RECORDS - El Segundo, CA USA http://www.billsmithcustomrecords.com/index.html
A&R Record Manufacturing - Dallas, TX USA http://www.arrecords.com/
GZ VINYL - Lodenice, CZECH REPUBLIC http://www.gzdm.cz/vinyl/
RECORDPRESSING.COM - San Francisco, CA USA (Record pressing plant is in Los Angeles, CA USA) http://www.recordpressing.com/
TOYOKASEI CO., LTD - Yokohama, Kanagawa, JAPAN http://www.toyokasei.com/
PALLAS - Diepolz, GERMANY (no website found)
-- Tom Fine