Over 35,000 photographs, postcards, slides
Over 2100 maps and plans
Over 900 family history files
Cemetery tombstone transcriptions
Manuscripts - diaries, letters, scrapbooks
Business and club records including the Beatty Bros. fonds
Farmers, business and telephone directories
County atlas, 1877, 1906
County wills index, 1840-1931
Municipal records: designated repository for the Municipal Records generated by Wellington County municipalities consisting of minute books, by-laws, tax assessment and collectors rolls, and voters lists.
Land Abstract Indexes (property ownership from first settlement)
Census for Wellington County, 1851 (no Erin Twp. or Guelph), 1861, 1871, 1881, 1891 (no Maryborough Twp.), 1901
Ontario Vital Statistics indexes: births (1869-1914), marriages (1869-1929), deaths (1869-1939)
Upper Grand District School Board records relating to one room schools
Women's Institute records; Tweedsmuir Histories
Couling Collection: architectural inventories, photographs and 13,000 slides documenting significant architectural structures in Guelph and Wellington County.