In the 1930 census, our subjects' son, Robert, indicates that his father was born in Alsace-Lorraine.

In the 1930 census, our subjects' son, Robert, indicates that his mother was born in Pennsylvania though, in earlier censuses, he had given his mother's birthplace as Ohio.

1.  Marriage Index: Ohio, 1851-1900, from Liahona Research (Broderbund CD-236):  Crawford County Court Records, Film #0388675-0388686.

Dombaugh, Philip

Deardorff, Ellen

26 Oct 1853

Crawford Co.

2.  See brief biography of "Robert S. Dombaugh" excerpted from A History of Marion County, Ohio, and Representative Citizens by J. Wilbur Jacoby (1907), and other excerpts from this work. 

3.  1790-1870 Ohio Census Index (online at Ancestry.com):

1850	Dombaugh	Nicholas	Tuscarawas Co.	Clay Twp.	p. 292
1860	Dombaugh	Valentine	Sandusky Co.	Fremont	p. 165
1860	Dombaugh	A.	Crawford Co.	New Washington Village	p. 278
1860	Dombaugh	Philip	Marion Co.	Marion Twp.	p. 328

 There's a good chance Nicholas is his father and the other two are his brothers.

4. Census Index:  Ohio, 1880 (Broderbund CD-20):

Dombaugh, Philip

Marion Co.

Marion Wards 1 & 4

p. 184D

5.  Potts, Allen L.  1999.  German Immigrant Death Dates from Marion County, Ohio: Probate Court Records.

Dombaugh, Philip

Oct 5, 1904

widowed

73y 7m 27d

Marion Village

Germany

bookkeeper

6.  Marion County, Ohio, Death Records, Vol. I, 1867-1800.  Marion Area Genealogical Society, Marion, OH.

Name	Death Date	Age	Place of Death	Place of Birth	Cause of Death
DOMBAUGH, Charles Deardoff	01/15/78	20y9m25d	Marion	Marion	Chronic Pneu

7.  Birthdates computed using Ben Buckner's Birthday Calculator.

8.  J. Wilbur Jacoby.  1907.  History of Marion County, Ohio, and Representative Citizens.  Biographical Publ. Co., Chicago, IL (Broderbund CD-450; also online at Heritage Pursuit).  Biographical sketch of  Robert S. Dombaugh.  Also in this work: 

p. 526

ROBERT S. DOMBAUGH, M.D., physician and surgeon, at Waldo, was born July 27, 1868, at Marion, Ohio, and is a son of Philip and Sarah Allen (DEARDORFF) DOMBAUGH. Philip DOMBAUGH was born in Germany and accompanied his parents to America at the age of 10 years.  They settled first at Gallon, Ohio, and later at Bucyrus.  After his marriage, Philip DOMBAUGH removed to Marion, where he was clerk of the courts for 15 years.  He reared a family of nine children, namely:  Philip Emerson, residing at Toledo; Harry Mason, who graduated from the United States Naval Academy, at Annapolis, Maryland, and is now serving as a lieutenant commander in the United States Navy; Charles who died in 1876; William, residing in California; Edgar A., deceased; Victor, who is connected with The Huber Manufacturing Company, at Marion; Robert S.; John, who died aged 19 years; and J. Frederick, who is connected with The Norris & Christian Lime & Stone Company, at Marion.  Philip DOMBAUGH died in October, 1905, his wife having passed away in 1894...

9.  Broderbund.  World Family Trees.  Vol. 6, Pedigree No. 1466.