— born in PA, either in Washington Twp., Snyder Co., PA, or Kelly Twp., Union Co., PA:
4.  J. Michael ICKES, b. 1850/1
5.  B. Elizabeth. ICKES, b. 1856/7
6.  William F. ICKES, b. Jul 1859

1.  Marriage Record:

2.  1840 Census Index/Images (online at Ancestry.com):  not found, but not really expected because he appears to have been unmarried in 1840 (there are two Samuel ICKES in the 1840 census of PA, but both are too old to be our subject).  The only individual in Union Co., PA, with a surname approaching ICKES is Lewis ICKY (æ 50-60) in West Buffalo Twp.  Lewis has no son in Samuel's age class, but he has one in the next lower age class, so if we accept this minor error, Lewis could be Samuel's father.  Certainly, the ICKY spelling is extremely rare.

2.  1850 Census Every-Name-Index/Images (online at Ancestry.com, Image #27 of 29):  Washington Twp., Union [now Snyder] Co., PA, Roll M432_831, p. 128B, 202/202, enumerated 29 Nov 1850, official enumeration date 1 Jun 1850 (extracted by Diana Gale Matthiesen):

Samuel Ickes	34	M		Farmer		Penna
Catharine Ickes	30	F				"
Henry Ickes	5	M				"
Sarah Ickes	4	F				"
Catharine Ickes	1	F				"

3.  1860 Census Every-Name-Index/Images (online at Ancestry.com, Image #1 of 20):  Mifflinburg P.O., Kelly Twp., Union Co., PA, Roll M653_1188, p. 789, PN 1, 730/695, enumerated 10 Jul 1860, official enumeration date 1 Jun 1860 (extracted by Diana Gale Matthiesen):

Samuel Icky	47	M		Laborer		50	Pa
Catherine Icky	41	F					"
Henry A Icky	15	M		Laborer			"
Sarah E Icky	14	F					"
Catherine Icky	11	F					"
J M Icky	9	M					"
B E Icky	3	F					"
W F Icky	10/12	M					"

4.  1870 Census Every-Name-Index/Images (online at Ancestry.com, Image #14 of 39 — indexed "Jcker"):  Buffaloe X Roads [Buffalo Crossroads] P.O., Buffaloe [Buffalo] Twp., Union Co., PA, Roll M593_1458, p. 468B, PN 14, 105/104, enumerated 23 Jun 1870, official enumeration date 1 Jun 1870 (extracted by Diana Gale Matthiesen):

Ickes Samuel	53	M	W	Farm Laborerer	300	350	Pennsylvania
_____ Catharine	51	F	W	Keeping House			Pennsylvania
_____ William	10	M	W	Attending School			Pennsylvania
_____ Michael	18	M	W	Farm Laborer			Pennsylvania
_____ Elisabeth	13	F	W	Attending School			Pennsylvania

Listed next to son, Henry ICKES (æ 25, b. PA, wife Margarett J.).

5.  1880 Census Every-Name-Index/Images (online at Ancestry.com):  he appears to be the Samuel ICKES (æ 66, b. PA, widower) living in Wayne Twp., Kosciusko Co., IN (p. 262C), with his married daughter, Anna Catharine.  Also in Wayne Twp., William ICKES (æ 19, b. PA), working out.

6.  Message posted to the Ickes Family Genealogy Forum (online at GenForum.com).

7.  Emails from "Barbara," who alerted me to the 1870 and 1880 census records, which I had not found.