Kampgrounds of America Inc. (KOA) marked its 50th year in 2012 by adding 18 more locations to its 489-campground system in North America.

KOA, the world’s largest system of family-oriented campgrounds based in Billings, Mont., experienced 3.3% growth in short-term camper nights in 2012, the highest percentage of growth since KOA’s record year in 2007. Registration revenues also increased nearly 6 percent from 2011 figures.

“It was a pretty exciting year, start to finish,” said KOA CEO Jim Rogers. “Celebrating our 50th Anniversary was very special, and it was just fantastic that we saw an increase in camping this year, too.”

The momentum from 2012 continues to carry into 2013 for KOA. On Jan. 11, Rogers will be featured on the Emmy-award-winning CBS reality series “Undercover Boss.” Rogers will go under cover at four KOA locations, learning the day-to-day operations of a campground from front-line staff. “Undercover Boss,” now in its fourth season, won an Emmy in 2012 as the top-rated reality series on television.

The “Undercover Boss” episode will air Jan. 11 at 8 p.m. (Eastern and Pacific), and 7 p.m. (Central and Mountain). For more on KOA’s episode of “Undercover Boss,” go to www.KOA.com.

Campgrounds added in 2012 include: Bluffton/Findlay SW, Ohio; Honesdale/Poconos, Pa.; Butler North, Pa.; Jonestown, Pa.; Travelers Rest/Greenville North, S.C.; Buffalo, Wyo.; Ozark/Fort Rucker, Ala.; Lake Panasoffkee, Fla.; Wildwood, Fla.; Lake Bomoseen, Vt.; Victoria/Coleto Creek Lake, Texas; Carbondale/Crystal River, Colo.; Lynchburg NW/Blue Ridge Parkway, Va.; Clinton/Knoxville, Tenn.; Batesville, Ind.; Salome, Ariz.; St. George/Hurricane, Utah.

KOA’s 18th additional franchise added in 2012 is a yet-to-be-announced campground in the Southeast U.S.

Other 2012 highlights for the iconic camping brand were a record-breaking 2012 KOA International Convention in Orlando, Fla., in November, with nearly 290 KOA campgrounds represented. More than 800 owners and staff attended the event. The Convention’s KOA Expo also set a new record with more than 150 vendors providing their products and services to KOA owners.

KOA’s industry-leading Value Kard Rewards program also saw strong growth in 2012, with an increase in membership of more than 7.5% from 2011.

KOA also partnered with 18 major companies in 2012 to offer KOA campers unique deals on products and services to enhance their camping lifestyles.