McNairns Buried in Ontario
This list is mostly, but not all, taken from the Ontario Cemetery Finding Aid.   When I know the family relationship I have indicated it. Those listed in purple can be found on my tree at jamcnairn.com.
Also, in some circumstances, a person may be listed on a monument and in the OFCA listing but may not be buried there.

Edwardsburgh Township, Grenville County
Edith M. McNAIRN at St. John's United Church, Riverside, Cardinal
Fannie McNAIRN, Johnson McNAIRN, Mary E. McNAIRN and William A. McNAIRN are all at St. Pauls, Anglican, Cardinal

Williamsburgh Township, Dundas County
Charles W. McNAIRN, his wife Ella M. PRESLEY, also H. Jean McNAIRN's husband Leslie James PRESLEY are at Fairview United Church, Mariatown (although H. Jean is listed on the monument, she is alive and well, as is, Charles Wesley)
Hester A. McNAIRN  at Mt. Pleasant
Alexander McNAIRN (son of John McNAIRN UE born 1745)  stone at Upper Canada Pioneer Village, Morrisburg
Mary E. McNAIRN is at Williamsburg Old Union Cemetery

Flambourough Township, Wentworth County
William Harvey McNAIRN, his wife, Hester Agnes WILSON and their son Capt. Ruthven Colquhoun McNAIRN are all at Grove.   

Logan Township, Perth County all at Knox Presbyterian, Mitchell
Agnes (Tomlinson) McNAIRN, David J. McNAIRN, Doris Ruth McNAIRN, Dorothy McNAIRN, Elizabeth (Scoins) McNAIRN, Evelyn L. McNAIRN, Joan L. McNAIRN, John D, McNAIRN, Leslie James McNAIRN LAC, Margaret (Reeves) McNAIRN, Norman A. McNAIRN, Olive McNAIRN, Ruth (Curtis) McNAIRN.  To see more info about these people from Mitchell go to the Mitchell Page

McNab Township, Renfrew County
Baby M.A. McNAIRN is at Arnprior, Albert Street

Ottawa, Carleton County
William Wallace McNAIRN and Janet Maria McNAIRN are both at Beechwood, Ottawa

Waterloo Township, Waterloo County
Audrey McNAIRN is buried at E.Woodland, Kitchener

Sydney Township, Hastings County
Samuel McNAIRN and his wife Helen St. George WILLS, their infant daughter Mary Helen McNAIRN and their son William Franklin McNAIRN at Belleville Cemetery