Ok so I am doing a little (lot) guess work.
The GL of Alabama had 25,885 members in 2013-2014.
The Grand Chapter of AL had 1,531 members in 2013-2014
The Grand Council of AL had 1,457 member in 2013-2014.
The Grand Commandery of AL had 1,507 members in 2013-2014.
Average York Rite 1,393 which is 0.05 of Alabama’s total Masonic membership.
The Scottish Rite Southern Jurisdiction says there are about 1.7 million Masons in the USA and about 550,000 belong to the SR.
The Masonic Service Association says there were 1,257,218 masons in the USA in 2013. Using the SR’s above numbers that would be about 0.31 of all Masons so of the 1,257,218 about 389,747 would belong to the Scottish Rite.
Using the Alabama 0.05 and 1,257,218 the estimate nationwide is 62,861 total York Rite.
Master Masons in the USA: 1,257,218
York Rite Masons in the USA: 62,861
Scottish Rite Masons in the USA: 389,747
Granted all of this is just a WAG (wild ass guess) but the membership numbers are from official documents. Also I’m assuming the membership percentages from Alabama reflect the Masonic numbers of the other 49 states.
Also these number do not include our Prince Hall Brethren. Not sure where to get any membership numbers for those grand lodges.