Rockford Public Library has free, online genealogy collections including:

• 1844 – 1981 Winnebago Co. Deaths
  

• 1855 – 1931 Winnebago Co. Births
  

• 1835 – 1856 Winnebago Co. Marriages (bride)
  

• 1836 – 1956 Winnebago Co. Marriages (groom)
  

• 1857 Rockford City Directory
  

• 1869 Rockford City Directory
  

• 1877 Boone Co. History and Directory
  

• 1877 McHenry Co. History and Directory
  

• 1877 Winnebago Co. History and Directory
  

• 1880 Boone Co. Census Index
  

• 1877 – 1906 Boone Co. Marriages
  

• 1877 – 1902 Boone Co. Births
  

• 1880 Rockford City Directory
  

• 1896 Belvidere, IL Illustrated History by the Belvidere Daily Republican Newspaper
  

• 1896 Belvidere & Rural Boone Co. City Directory
  

• 1903 Rockford, Illinois History
  

• 1906 History of Blaine & Hunter Farm Communities in Boone Co.
  

• 1909 Boone Co. Historical Encyclopedia
  

• 1910 Belvidere & Rural Boone Co. City Directory
  

• 1917 McHenry & Boone Co. Prairie Farmers Directory

• The Crusader Digital Archive

MAPS

• 1859 Rockford, IL (City)
  

• 1859 Winnebago County, IL
  

• 1859 Winnebago County, IL (Township)
  

• 1870 Boone County, IL
  

• 1856 Belvidere, IL (City)
  

• 1870 Belvidere, IL (City)
  

• 1876 Belvidere, IL (City)