The DYS19 (also known as DYS394) STR marker is one of the slower-changing markers. For example, yhrd.org research consensus estimates that the mutation rate of this marker is about 0.00231; whereas, McGee's Y-Utility 111 offers the choice of 0.00145 (MacDonald) or 0.00399 (FTDNA derived) for DYS19. McGee's Y-DNA Mutation Rates for many common markers are posted at those latter two links.
Very few tested persons exhibit the low DYS19 marker value of 9 or less. Most people are in the range of 13 to 17. In the E1b1b1 haplogroup, 13 or 14 seems dominant. Some mid-Eastern individuals are 11. At least two persons, father and son, have recently tested at DYS19=10.
Several studies of allele distributions, including DYS19, exist on the web:
Yhrd.org graphs population distributions (apparently, in data population size of about 80,000).
Resorting to the "WaybackMachine", we find an ethnic breakdown (from 2002 ystr.org data, total population about 10,000):
Sorenson Molecular Genealogy Foundation (https://www.smgf.org is no longer on the web) had the following information:
Genebase.org had the difficult-to-find-again link "https://www.genebase.com/in/dnaMarkerDetail.php", showing the following, with no background information. The instance of 6 is extremely dubious. This company apparently does not share data.
Recent (September 2018) data in the familytreedna.com E-M35 project, with 4172 members all having E-M35 and subset SNPs, is shown here. Not all of our 31 known persons, not even all 17 of the DYS19<=9 Project, are currently included in the E-M35 project.
A click on the figure will go to the E-M35 database.
Published data for DYS19<=9 has been gathered here for ease of analysis. If any entity objects to this posting, please contact the author at the email address given at the foot of the page.