Hi Dot, After John McQuillen's death in 1830, I did wonder could he have had family that decided to emigrate that year ie John McQuillen, who was born in Ireland, and came to the United States in 1830; marrying and Margaret (Lang) and lived in Albany, N.Y., till he came to Jones Co. in the spring of 1846; he settled where his sons now live : lie died in the fall of the year he came to the county. ……
from
http://iowajones.org/bio/bioMcNE.htmFrom History of Jones County, Iowa, Western Historical Company, Chicago, 1879, page 690.
from Ros Davies website the first entry McQUILLAN family is astonishing to read.freepages.genealogy.rootsweb.ancestry.com/~rosdavies/SURNAMES/Mc/McQuMcS.htm#q
Then I found using Google almost an overwhelming number of references to postmaster and Post Masters
eg from 1861
www.afhs.ab.ca/publications/armstrong/post_office_1861.htmlthis is Canada
Mount Johnson Rouville John McQuillen
eg from 1884 - 1885
www.rootsweb.ancestry.com/~kyfrankl/PostOffices.htmthis is Kentucky
HARVIELAND - Located 5 1/2 miles north-west of Frankfort - John W. McQuillen, Postmaster
eg from
http://www.stillwatercountynews.com/archive/040303.htmlColumbus Post Office honored. The Post Office in Columbus has been honored with the Order of the Yellow Jersey. The honor is in recognition of the services provided to customers, said Chester McQuillen, postmaster at the Columbus branch. This is the second year of this honor’s existence ......
eg from
http://files.usgwarchives.net/pa/clearfield/bios/mcquillen-john-t.txtBIO: John T. McQUILLEN, Clearfield County, PA
Contributed for use in the USGenWeb Archives by Judy Banja & Sally
.He was born at Tyrone, Blair County, Pa., in September, 1856, and is a son of Adam and Mary (Boyle) McQuillen.
Adam McQuillen was born in Blair County, a son of Thomas and Jennie (Hunter) McQuillen. For many years he was a railroad man and now is postmaster at Woodland, in Clearfield County. He married Mary Boyleetc
eg from
http://www.cangenealogy.com/armstrong/pos1861.htmPost Offices, 1861
from The Canadian Almanac and Repository of Useful Knowledge, 1861
In the following List of Post Offices, the Electoral County or Division in which each are situated and the names of the Post Masters are given, corrected to the 1st Oct. 1861.
NOTE: * = Offices are authorised to grant and pay Money Orders.
Name of Post Office Electoral County or Division Name of Postmaster
Mount Johnson Rouville John McQuillen
eg from
http://scott.k12.va.us/bettyjane/irishhistory.htmThe Quillin Clan from Northern Ireland
Old Uncle Charlie Quillin was the postmaster during the Civil War at Quillinsville and served in the VA State General Assembly from 1830's to the 1850's.
Information comes from The Quillen Family History Scott Co, VA, Claude MacQuillin and Milligan W. Quillen c.1961 rp.1987.
Thats an amazing record of similar occupations
I dont think I can help you much further. have you tried the Ulster Historical Foundation databases and PRONI databases and NIFHS special genealogical database?
Good luck, Jim