These statistics are as of 2006.
* Utah - 72% * Idaho - 27% * Wyoming - 11% * Nevada - 7% * Arizona - 6% * Hawaii - 5% * Montana - 5% * Alaska - 4% * Oregon - 4% * Washington - 4% * New Mexico - 3% * Colorado - 3% * California - 2% * Nebraska, Kansas, Oklahoma, South Dakota, Virginia, Missouri, Texas - 1% * All others - less than 1% Stats taken from http://www.mormonwiki.com/Membership_Statistics_U.S.
The U.S. cities with the largest percentage of members of the Church of Jesus Christ of Latter-day Saints (commonly called "Mormons") in the population are small farming and ranching communities in northern and central Utah. These tiny towns are often nearly 100% Mormon. Suburbs of Salt Lake City and other suburb-size cities (such as St. George and Logan) are made up of about 60% practicing Mormons, while Salt Lake City itself has one of the lowest Mormon populations in Utah (percentage-wise) at about 40-50% practicing Mormons.
I dont know of anywhere that you can find the population of members of the Church of Jesus Christ of Latter Day Saints (Mormons) by city, but I do know that you can find the population by state or country by going to http://newsroom.lds.org/ldsnewsroom/eng/statistical-information.
Or, you can find if there is a congregation in or near a specific city by going to maps.lds.org.
Utah has by far the largest population of members of the Church of Jesus Christ of Latter-day Saints (the "Mormon" church) with 1,884,377 members (68% of the population).
Other states with high Mormon populations by percentage are:
Idaho (26% of the population is Mormon)
Wyoming (11% of the population is Mormon)
Nevada (6% of the population is Mormon)
Arizona (6% of the population is Mormon)
Hawaii (5% of the population is Mormon)
States other than Utah with the most Mormons (by individual, not percentage) are:
California with 757,895 members
Idaho with 410,757 members
Arizona with 381,235 members
Texas with 286,902 members
Washington with 263,004 members
These membership statistics are current as of January 1, 2010.
Maybe you are thinking of Salt Lake City, Utah. Salt Lake City is the location of the headquarters of the Church of Jesus Christ of Latter Day Saints (also called the "Mormon" Church).
Salt Lake City, Utah (and it's suburbs) have the greatest Mormon (LDS) population.
Utah.
Alaska is the largest US State and ranks #47 in population.
the largest population state is California and the smallest population state is Rhode island
Alaska is the largest state in the US by area. California is the largest state in the US by population.
Alaska is the largest state by area in the US, California is the largest by population.
California has the largest population.
California.
The state with the largest population is California, and its capital is Sacramento. (see the related question)
Washington with a population of 6,724,540.
Texas is largest in area; California is largest in population.
Virginia
Florida.
Texas