In response to some questions and suggestions...
I have now viewed 1911 census for Owen Hughes, M, boarder, age 20, 652/2 18/10, a tube worker in Coatdyke, Coatbridge, Scotland, and he lived with William Lennon (head) and others from Ireland at 523 Main St. Owen's age seems off compared to my grandfather but perhaps it was a recording error or one to make him more employable.
The valuation roll in 1914 for James Hughes (a cousin perhaps?) has him as a tenant in Airdrie at 43 Kippen St. My grandfather Owen Hughes's marriage license (known to definitely be his) states that his address was 44 Kippen St. so there seems to be a definite connection.
I have never used valuation rolls before. Thanks for leading me there SCOTMUM. These, no doubt, are my grandparents: HUGHES, OWEN, Tenant Occupier HOUSE 16/I/1 EAST STEWART STREET, OLD MONKLAND, 1920 and Jessie was still there in 1925: HUGHES JESSIE Tenant Occupier HOUSE 16I/1 EAST STEWART STREET OLD MONKLAND 1925
The mention of James Hughes by MonicaL has me curious about a connection between him and my grandparents, but I could not figure it out based on the tree with link that was mentioned. I did download his marriage register which mentions his E Stewart St. Coatbridge address that my grandMOTHER had on HER marriage paperwork as her street address. Too coincidental to be unrelated.
Does Hugh Hughes seem to be the same person as Owen Hughes? More research to continue. I need to see if I can find a birth record for Owen in Armagh or more info to merge my Owen to Hugh. I will continue to use the valuation records. I have spent a fortune on Scotland's People but love when I find a piece of the puzzle.
Jessie