LDS Mingle - LDSMingle.com isn't as large as the last site, but it still deserves a chance.
It takes just a couple of minutes to create a free profile.
The Advanced Search will let you drill the list down to the singles that match your preferences. Then you can find out if there are enough people you're interested in and if you want to continue using the service.
An short cut way to search for matches is to use the various one-click search options.
LDS Planet - You can also try your luck at LDSPlanet.com.
It's very, very easy to create your personals ad. Actually I think it’s a little too simple. There should be more questions that encourage people to provide more insight into their personalities and what they're looking for.
You should try the first two websites first. LDSPlanet should be the very last website that you try.
Hopefully one of these LDS singles sites can help you find your match!
NOTE: It goes without saying that the most singles are in areas with a heavy LDS population - Utah, California, Idaho, Arizona, etc.