— born in Marlborough Twp., Delaware [now Marion] Co., OH:
  4.  Paul CRAWFORD, b. 16 Mar 1809 
  5.  Ebenezer CRAWFORD, b. 1810
  6.  William CRAWFORD, Jr., b. ca. 6 Oct 1812; d. 13 Jan 1845
  7.  Peter CRAWFORD, b. 1814
  8.  Margaret CRAWFORD, b. 1816
  9.  Calvin CRAWFORD, b. 1818
10.  Elijah CRAWFORD, b. 1820
11.  (Son A) CRAWFORD, b. 1820-25
12.  (Son B) CRAWFORD, b. 1825-30

1a.  Census Index:  U.S. Selected Counties, 1820 (Broderbund CD-314):

1820

Crawford, William

OH

Delaware Co.

Marlborough Twp.

p. 183

1b.  1820 Census Index and Digital Images (online at Ancestry.com; Image #1 of 2; extracted by Diana Gale Matthiesen):

1820

OH

Delaware Co.

Marlborough Twp.

p. 108

William Crawford

411020-11110-0-200

These data indicate:

No. & Sex	Age Class	Therefore Born	Individuals Inferred
4 males	9 or under	1810-1820	= Calvin (b. 1818) = Peter (b. 1814) = William Jr. (b. 1812) = Ebenezer (b. 1810)
1 male	10-15	1804-1810	= Paul (b. 1809)
1 male	16-18	1801-1804	= Jacob (b. 1805)
2 males	26-44	1775-1794	= William (b. 1785)
1 female	9 or under	1810-1820	= Margaret (b. 1816)
1 female	10-15	1804-1810	= Hannah (b. 1807)
1 female	16-25	1794-1804	= Priscilla (b. 1804)
1 female	26-44	1775-1794	= Mary
2	persons engaged in agriculture

Either Jacob is in the wrong age class, or we have his birthyear wrong.

2a.  Census Index:  U.S. Selected Counties, 1830 (Broderbund CD-315):

1830

Crawford, William

OH

Marion Co.

Richland Twp.

p. 163

2b.  1830 Census Index and Digital Images (online at Ancestry.com; Image #1 of 7; extracted by Diana Gale Matthiesen):

1830

OH

Marion Co.

Richland Twp.

p. 163

William Crawford

121 110 100 - 000 100 100

These data indicate:

No. & Sex	Age Class	Therefore Born	Individuals Inferred
1 male	4 or under	1825-1830	= Son B
2 males	5-9	1820-1825	= Son A = Elijah (b. 1820)
1 male	10-14	1815-1820	= Calvin (b. 1818)
1 male	15-19	1810-1815	= William Jr. (b. 1812)
1 male	20-29	1800-1810	= Jacob (b. 1805)
1 male	40-49	1780-1790	= William (b. 1785)
1 female	15-19	1810-1815	= Margaret (b. 1816)
1 female	40-49	1780-1790	= Mary

Either Margaret is in the wrong age class, or we have her birthyear wrong.

3.  Census Index:  U.S. Selected Counties, 1840 (Broderbund CD-316):

1840

Crawford, William

OH

Delaware Co.

Marlboro Twp.

p. 248

4a.  Census Index:  U.S. Selected Counties, 1850 (Broderbund CD-317):

1850

Crawford, William

OH

Marion Co.

Waldo

p. 9

4b.  1850 Census Index/Images (online at Ancestry.com; Image #17 of 24):  Waldo Twp., Marion Co., OH, p. 9A, 121/121, enumerated 7 Sep 1850 (extracted by Diana Gale Matthiesen):

William Crawford	65	M	farmer	800	NJ
Mary Crawf (sic)	62	F			Pa
Elijah	30	M			Ohio

5.  1860 Census:  Mary Crawford (female, age 74, b. PA), living with Elijah Crawford in Waldo Twp., Marion Co., OH, p. 409 (extracted by Sharon Moore).

6.  Paul J. & Barbara Midlam.  1985.  Marion County, Ohio, Cemetery Inscriptions (online at Heritage Pursuit):

CRAWFORD, William, Sr.

(Stone broken)

Waldo [Cemetery]

Waldo

Secondary sources show William, Sr., as buried in Wyatt Cemetery, but the Midlam's show him as buried in Waldo Cemetery (William, Jr., is buried in the Wyatt Cemetery).

7.  Jane Peppler.  1999.  Marion County, Ohio, Deed Book, Volume 3, 1829-1831 (online at Heritage Pursuit):

Pg	Grantor	Grantee	Date Signed	Neighbors/Witnesses
310	William Crawford Mary Crawford	Joseph Boyd	1/20/1830	John Dewall; William Smith  Daniel Obom; Samuel Stroub

Daniel "OBOM" is probably Daniel "OBORN."

8.  GenServ Database:  HICE7NA, by Jerry Hicks.

9.  LDS.  Family Search: Internet Genealogy Service: IGI - International Genealogical Index and AF - Ancestral File (online at FamilySearch.org).