How many Seventh-day Adventist churches are there?

Answer 1

There are 13 divisions, which is the highest level of organization under the general conference. Below that are the union conferences and union missions (which are the same thing, except that they are not self-sustaining). According to Adventist.org, on the union conference level, there are:

Union Conferences............................................................................................................................ 51

Union Missions................................................................................................................................... 55

Answer 2

At the end of 2010: 70,188 official churches and 65,157 companies.