Got to the website of the LDS (Latter Day Saints) Church. They publish the figures.
The standard warning is that they count ever person who was officially admitted to the church-- not subtracting those who have quit practicing the faith. Like other churches, there are the gross totals and then there are the 'practicing' members.
2008 year-end records for the Church list 13,508,509 baptized members worldwide.
The official 2008 year end records of the Church of Jesus Christ of Latter-day Saints (commonly called the "Mormon" Church) list 13,508,509 baptized members of the Church worldwide. 2009 year end records will not be released until April 2010.
As of January 2010, there are 13.8 million baptized members of the Church of Jesus Christ of Latter-day Saints (the "Mormon" church) worldwide. The world population is approximately 6.7 billion. This means that 0.21% of the world's population is Mormon. This is about same as the percentage of the world's population that is Jewish (0.22%). In contrast, 17% of the world's population is Catholic, 21% of the world's population is Muslim, 14% of the world's population is Hindu, and 6% of the world's population is Protestant Christian.
Approximately 2% of Americans are members of the Church of Jesus Christ of Latter-day Saints (the 'Mormon' Church). The concentration of Mormons is much higher in the western US than in the east. For example, in Utah, about 60% of the population is Mormon. Arizona is 6% Mormon, Washington state is 4% Mormon, and Wyoming is 11% Mormon. Compare these numbers to east coast states, such as New Jersey (0.4% Mormon), New Hampshire (0.6% Mormon) and Alabama (0.7% Mormon).
As of January 1, 2011, there were 14,131,467 baptized members of the Church of Jesus Christ of Latter-day Saints (the "Mormon" church) worldwide. This is approximately 0.21% of the world's population. To compare, about 1% of the world population is Catholic, 21% is Muslim, and just like Mormons, 0.21% are Jewish.
As of January 2010 there were 6,059,784 baptized members of the Church of Jesus Christ of Latter-day Saints (the "Mormon" church) in the United States. The US population is 307,006,550. So approximately 2% of people in the United States are Mormons.
There are approximately 6.5 billion people on the earth and 13.5 million of those are members of the Church of Jesus Christ of latter-day Saints (commonly called the "Mormon" Church). That means that 0.21% of the world population is Mormon.
Approximately 4% of Alaska's population is Mormon.
In 2012, the Church of Jesus Christ of Latter-day Saints (the "Mormon" church) reported 176,307 baptized members living in the state of Nevada. Since the population of Nevada is about 2.7 million, this means that approximately 0.7% of the population of Nevada is Mormon.
The Mormon church has nearly 15 million members world-wide with just over 6 million living within the United states. The U.S. has 313 million people. That makes the Mormon population in the United States at just over 2%.
The Church of Jesus Christ of Latter-day Saints (the "Mormon" church) does not release membership statistics for cities, only for states. So we don't know exact the Mormon population of Salt Lake City in 2004, but it was probably around 30-40%. The city itself has quite a low Mormon population compared to the rest of the state.
As of January 2015 the Church of Jesus Christ of Latter-day Saints (commonly called the "Mormon" church) reported 15,372,337 baptized members worldwide. The UN recently estimated the world population at 7 billion (7,000,000,000). 15372337 / 7000000000 = 0.00220 This means that approximately 0.2% (two in every thousand people) of the world population is a baptized Mormon.
As of January 2010, there were 6,058,907 baptized members of the Church of Jesus Christ of Latter-day Saints (the "Mormon" church) in the United States. This means that approximately 2% of Americans are Mormons. The concentration of Mormons is much higher in the western US than in the east. For example, in Utah, about 60% of the population is Mormon. Arizona is 6% Mormon, Washington state is 4% Mormon, and Wyoming is 11% Mormon. Compare these numbers to east coast states, such as New Jersey (0.4% Mormon), New Hampshire (0.6% Mormon) and Alabama (0.7% Mormon).
The Church of Jesus Christ of Latter-day Saints (the "Mormon" church) only publishes membership information for nations and states, not individual cities. The reported number of baptized Mormons in Oregon as of January 2012 was 149,089. If you need more specific information about just the Portland area, you will have to contact local Mormon leaders who have access to that information.