1.  Timothy Hopkins.  1932.  John Hopkins of Cambridge, Massachusetts, 1634, and Some of His Descendants. Stanford Univ. Press, Stanford, CA.  On pp. 640-641:

ORRIN KELLOGG9 (SAMUEL FREDERICK,8 MARK,7 MOSES,6 SAMUEL,5 TIMOTHY,4 JOHN,3 STEPHEN,2 JOHN1), b. at China, Michigan, 7 July 1836; m. at Sheridan, California, 14 October 1874, Josephine Smith, b. 14 April 1853, daughter of Phillip Hale and Elizabeth C. (Hooser) Smith.  He d. at Oakland, California, 7 February 1888. He came to California in the early 'seventies on account of poor health, and after a few years on the farm of his uncle, Moses Hopkins, entered the service of the Central Pacific Railroad as station agent at Sheridan.  In about 1882, he resigned and devoted himself to his own affairs. Children: WILLIAM FREDERICK,10 b. 5 May 1876; m. (1) Ida Platt; (2) (?). CHARLES,10 b. 9 November 1877 MABLE,10 b. 7 September 1881; m. (1) Charles C. Quinn; divorced; (2) A. Van Phinney of Sacramento, California. She d. (?). Child surname Quinn: I. DOROTHY. She took the name of Van Phinney. A graduate of the University of California. Residence (1931) Sacramento.

2.  Marriage Record:

3.  1860 Census:  Orrin is unmarried and living with his parents in St. Clair, St. Clair Co., MI.

4.  1870 Census:  Orrin is unmarried and living with his parents in St. Clair, St. Clair Co., MI.

5a.  1880 Census Images (online at Ancestry.com; Image #2 of 39):  Adams Street, City of St. Clair (Ward 1), St. Clair Co., MI, p. 467B, PN 2, SD 3, ED 392, enumerated 1 Jun 1880 (extracted by Diana Gale Matthiesen):

1

2

3

4

5

6

8

9

10

13

24

25

26

14

14

Hopkins Orrin

W

M

43

/

Lawyer

NY

MA

MA

Dean Elvira

W

F

42

House Keeper

/

NY

NY

NY

____ Ruth

W

F

4

Boarder

/

NY

NY

NY

Meyers Mary

W

F

14

Servant

/

Domestic

MI

Ger

Ger

Orrin was born in Michigan, not New York.  Orrin's wife and son are living in California with her parents (see next source).

5b.  1880 Census Images (online at Ancestry.com, Image #19 of 27):  Village of Sheridan, Township Ten [Lincoln Twp.], Placer Co., CA, p. 272C, PN 19, SD 2, ED 70, enumerated 10/11 Jun 1880, official enumeration date 1 Jun 1880 (extracted by Diana Gale Matthiesen):

1880:  for an explanation of the column headings, please see What the Numbers in the Federal Census Mean (missing columns contained no data).

1

2

3

4

5

6

8

9

10

13

24

25

26

180

181

Smith Phillip

W

M

60

/

Laborer

TN

VA

VA

_____ Elisabeth

W

F

48

Wife

/

Keeping House

PA

PA

PA

_____ Benita A

W

F

20

Dau

/

At Home

CA

TN

PA

Hopkins Josephine

W

F

20

Dau

/

At Home

CA

TN

PA

_______ William

W

M

4

GrandSon

CA

MI

CA

Lehey Thomas

W

M

18

Boarder

/

Laborer

MI

Ire

Ire

6.  1890 Census:  the 1890 Census Population Schedules were destroyed.

7.  1900 Census:  not found, at least not in California.

8.  A.T. Andreas [Alfred Theodore Andrews].  1883. History of St. Clair County, Michigan.  A.T. Andreas [Andrews] & Co., Chicago (biographies online at the at the St. Clair County, Michgan: Indexes page).

p. 676

St. Clair Township... Orin K. HOPKINS, was born in China Township, this county, July 7, 1836, and is a son of Samuel F. HOPKINS, of whom we make further mention in this work.  He received his early education in St Clair City.  In 1858, he went to Wisconsin and worked at his trade, which is that of carpenter.  In 1860, he returned to Detroit and worked in Charles Kellogg's pattern shop until 1861; he then went to Ann Arbor and worked a short time for McGregor, at six shillings a day.  He returned to Detroit that fall, and enlisted in Brady's Sharp Shooter Company in the United States army, and was attached to the Sixteenth Michigan Infantry, under Col. Stockton.  He served in this capacity until 1863, when he was discharged on account of disability.  He was all through the peninsula campaign and at Fortress Monroe.  In 1864, he went to Muskegon, Mich., and worked at his trade during the summer, and in the fall went to Chicago.  The following spring he returned to St Clair and to Alpena, Mich., where he remained until 1868, and then went to Cheboygan. In 1869, he went to California; he then spent on year on his uncle's ranche; and then entered the employ of the railroad company, as station agent, which position he held until 1879, when he returned to his old home in St Clair.  He was married October 14, 1874, to Miss Josephine SMITH, a native of Sacramento City.  They have two children -- William F. and Mabel.  Mr. HOPKINS left for California again, in June, 1882, where he, with his family, will make their future home at Oakland, California.

Orin's uncle with a ranch in California was Moses HOPKINS, brother of Mark HOPKINS, railroad baron.