from the 1880 census St. Louis, St. Louis, MO FHL Microfilm #1254720 NARA Microfilm T9-0720 page 475C
H. Kammann (35, born Hanover) Katherina Kammann (wife, 34, born Prussia) Anna Kammann (daughter, 11, born MO) Wilhelm Kammann (son, 8, born MO) August Kammann (son, 5, born MO) Louis Kammann (son, 2, born MO) Henrich Kammann (son, 9m, born MO)
H. Kammann is actually William H. Kammann
This information can be found in the new 1880 census on CD-Rom from the Family History Library as well as on the microfilm listed above. Anna Kammann is my great grandmother.