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Leah Hogsten | The Salt Lake Tribune Christmas season on Temple Square officially opens each year when the millions of Christmas Utah's most poplulous counties show increase in LDS population Salt Lake County is now 51.41 percent LDS, while Utah County is on Percent of population that is LDS Mormons comprised 62.64 percent of the Utah population in 2013. The split was more even in Salt Leah Hogsten | The Salt Lake Tribune Christmas season on Temple Square officially opens each year when the millions of Christmas Al Hartmann | The Salt Lake Tribune Temple Square with Tabernacle, Salt Lake Temple, LDS Conference Center, Jospeh Smith Buid