From the United States Census:

1860 Census [Sugar Grove, Kane, IL., p 388]:

• C.B. Cassingham, male, age 22, born Ohio
• Franklin Cassingham, male, age 17, born Illinois
• Adeline Cassingham, female, age 11, born Illinois

1860 Census [Aurora, Kane, IL., p. 161]:

• Henry Cassingham, male, age 32, born Ireland
• Ann Cassingham, female, age 30, born Ireland
• Sarah Cassingham, female, age 4, born Illinois
• Kate Cassingham, female, age 1, born Illinois

1860 Census [Wayne, Muskingum, OH., p. 289]:

• Hannah Cassingham, female, age 21, born Ohio, married within the year. (Hannah is listed last in the household of James Cassingham -- after all his children. The reference to "married within the year" would seem to make her the wife of one of James' sons -- but none of them married a Hannah.)

1850 Census [Jefferson, Muskingum, OH., p. 165]:

• Ann Cassingham, age 21, born England

1860 Census [Jefferson, Muskingum, OH., p. 539]:

• Ann Cassingham, age 30, born England

1870 Census [Jefferson, Muskingum, OH., p. 173]:

• Ann Cassingham, age 40, born England

1900 Census [Dallas, Hancock, IL. p. 2]:

• Clarence A. Lincoln, male, grandson of Willis and Sarah (Cassingham) Lincoln, age 9, born Oct 1890 in Illinois. Clarence is listed as Sarah's grandson, but we don't know who his father and mother are.

From the Social Security Death Index:

• Barbara Ann Taft (married name was Cassingham), SSN 566-18-0341, issued CA, born 23 Jul 1919 in California, died 19 Jul 1995, last residence Santa Barbara, Santa Barbara, California. Mother's maiden name was Blair. (Information supplemented by California Deaths, 1940 - 1997.)
• Doris Cassingham (may be a married name), SSN 490-14-2224, issued Missouri, born 2 Sep 1921, died May 1998, last residence Prescott, Yavapai, Arizona.
• Dorothy Cassingham Peterson (probably a married name), SSN 336-44-7928, issued Illinois, born 11 Apr 1901, died 17 Jul 1986 in Harris County, Texas, last residence Houston, Harris, Texas. (Information supplemented by Texas Deaths, 1964-98.)
• Elizabeth Cassingham (may be a married name), SSN 510-32-4076, issued Kansas, born 6 Apr 1899, died Nov 1969, last residence Wichita, Sedgwick, Kansas.
• Lucille Cassingham (may be married name), SSN 249-16-4699, issued South Carolina, born 6 Oct 1912, died Oct 1978, Casper, Natrona, Wyoming.
• Minnie Cassingham (may be married name), SSN 520-48-0509, issued Wyoming, born 14 Dec 1905, died 8 Dec 1992, last residence Lander, Fremont, Wyoming.

From California Birth Records, 1905 - 1995 [RootsWeb]:

From "Ohio Death Certificates:"

• Elizabeth A. (Cassingham) Carroll, born: 9 Sep 1963, Cincinnati, Hamilton, Ohio. Died: 16 Aug 1998, age 34. SSN: 275-69-9611. Father's surname: Cassingham. Mother's surname: McMahan. Marital Status:Divorced. [Vol 31631 # 060773]
• (male) Cassingham, died 3 Oct 1970, Cincinnati, Hamilton County. Lived only 2 hours. Residence: Reading, Hamilton County. [Vol 20268 # 084362]
• Charife I. Cassingham, died between 1933-1937, Cuyahoga County [Vol 778 # 44706]

From "Cemetery Records of Coshocton County, Ohio" [FHC film # 928174]:

• Vol 6, page 108, "Isaac, son of Charles and Elizabeth Cassingham, died Sept 27, 1851 age 21 years 7 months 27 days"

From "Cemetery Records of Carroll County, Missouri":

• Vol 4, Big Creek Cemetery (3 1/2 miles southwest of Bosworth, Missouri)
  Ellie Jane Cassingham, 1879 - 1910

From "Marriage Records, Texas 1966 - 1997" [RootsWeb.com]:

• File # 00280: "Randy D. Cassingham, age 33, married Christine Chok, age 32 on 3 Jan 1983 in Ector County, Texas.

From the Providence Rhode Island Index of Births, Marriage and Deaths:

• Married: Frank A. Cassingham to Emma Warburton, 12 Jun 1875
• Birth: Lilian Emily Cassingham, born to Frank and Emma Cassingham, 17 Apr 1876
• Birth: Charles H. Cassingham, born to Frank and Emma Cassingham, 15 Nov 1877
• Death: Charles H. Cassingham, 25 Aug 1878
• Birth: Rosabel Cassingham, born to Frank and Emma Cassingham, 4 Dec 1878

From the "Daily Oklahoman," Oklahoma City, Oklahoma of 12 Feb 1992, Obituaries:

• Julia F. Yon Cassingham, died

From "Marriages of Muskingum County, Ohio:"

• Phebe Cassingham married Robert Seaman, 1 May 1851 [Could this be a mis-reading of the marriage of Phebe Cassingham and Robert Tarman?]

From "Howard County Nebraska Marriages:"

• Bessie E. Cassingham married Wm. E. Howard. Recorded in Book 2, Page 450.

From the Morning News Tribune of Tacoma, Washington (9 Jan 1993):

• Keri Cassingham born 31 Dec 1992 at Auburn General Hospital. [No parents are named, but the family lives in Enumclaw, King, Washington.]

From a LaHarpe, Illinois newspaper obituary, Mar 1988:

• Ina Clarinda Goff born 8 Jun 1912. Died Mar 1988. (Read the entire obituary.)

From the American Civil War Research Database:

• Owen Cassingham enlisted 2 Aug 1864 in the Union Army as a private. He served in G Company of the 140th Infantry, Ohio. He claimed to be 18 years old.
• John W. Cassingham enlisted 24 May 1861 in the Union Army as a private. He was later promoted to full corporal. He served in F Company of the 16th Infantry, Illinois. He was mustered out on 8 Jul 1865. He claimed his residence as LaHarpe, Illinois.

From other records:

• Ora Cassingham married Nettie Sutton, 12 Mar 1882, Berrien County, Michigan