Cinemark has just announced their list of theaters that will screen The Hobbit in the HFR 3D (48 fps 3d) format.  And as TheaterNational correctly pointed out, all Cinemark XD auditoriums will be showing The Hobbit in HFR 3D. Check out the full Cinemark list below:

Alaska
Anchorage, Century 16 & XD

Arizona
Tucson, Century 20 El Con & XD
Tucson, Century Park Place 20 & XD

California
Corte Madera, Century Cinema
Daly City, Century 20 Daly City & XD
Fremont, Century at Pacific Commons & XD
Huntington Beach, Century Huntington & XD
Lancaster, Cinemark 22 & IMAX
Milpitas, Century 20 Great Mall & XD
Monterey, Monterey 13
Napa, Century Napa Valley
Orange, Century Stadium 25 & XD
Oxnard, Century RiverPark 16 & XD
Pleasant Hill, CinéArts at Pleasant Hill
Rancho Mirage, Century @ The River & XD
Redding, Cinemark Redding 14 & XD
Redwood City, Redwood Downtown 20 & XD
Rocklin, Blue Oaks Century Theatres & XD
Sacramento, Century 16 Greenback Lane & XD
Sacramento, Century Stadium 14
San Bruno, Century at Tanforan & XD
San Jose, Century 20 Oakridge & XD
Union City, Century 25 Union Landing & XD
Victorville, Cinemark 16 Victorville & XD
Walnut Creek, Walnut Creek 14 & XD

Colorado
Boulder, Century Boulder
Colorado Springs, Cinemark Carefree & IMAX
Colorado Springs, Cinemark Tinseltown USA & XD
Lakewood, Century 16 Bel Mar & XD