— born in Trigg or Todd Co., KY:
3.  Verlinda L. BURRUS, b. 1820/1
4.  Charles B. BURRUS, b. 1820-30
5.  Henry Clay BURRUS, b. 1820-30
6.  Nancy P. BURRUS, b. 1828/9
7.  Mary Elizabeth BURRUS, b. 1829/30

1.  Jordan R. Dodd, ed.  1993.  Kentucky Marriages:  Early to 1850.  Liahona Research, Orem, UT (Broderbund CD-229):

Burrus, Henry

Daniel, Nancy

Feb 29, 1816

Christian Co.

2.  1820 U.S. Census Index/Images (online at Ancestry.com):  can't find.

3.  1830 U.S. Census Index/Images (online at Ancestry.com):  can't find.

4.  1840 U.S. Census Index/Images (online at Ancestry.com; Image #13-14 of 71 — mis-indexed as "Benner" and as being in "Todd City" because the "Cty" in "Todd Cty" was misread as "City" [there's no such place as Todd City]; extracted by Diana Gale Matthiesen):

1840

KY

Todd Cty.

p. 7 | pp. 244B-245A

Ln. 22

Burrus Nancy

001 100 000 - 001 110 100

no slaves

0100000

These data indicate:

No. & Sex	Age Class	Therefore Born	Individuals Inferred
1 male	10-14	1825-1830	= Henry or Charles
1 male	15-19	1820-1825	= Charles or Henry
1 female	10-14	1825-1830	= Mary (b. 1829/30)  = Nancy (b. 1828/9)
1 female	15-19	1820-1825	= Verlinda (b. 1820/1)
1 female	20-29	1810-1820	= Sarah (b. 1818/9)
1 female	40-49	1790-1800	= Nancy (b. 1797/8)
1	person employed in agriculture

It's hard to blame the indexer; Nancy's surname is a capital "B" followed by seven bumps.  On the other hand, reading "Todd Cty" as "Todd City" is a pretty stupid error.

5.  1850 Census Index/Images (online at Ancestry.com; Image #90 of 100):  District No. 1, Todd Co., KY, p. 239B, 642/647, enumerated 7 Sep 1850 (extracted by Diana Gale Matthiesen):

Nancy Burrus	52	f		1000	Ky
Wm Roger "	33	m	Farmer		"
Sarah    "	31	f			"
Nancy    "	21	f			"

Why is William back?  Or, rather, where was he in 1840?  Listed next to Nancy's brother-in-law, Nathaniel BURRUS. 

6.  Indenture between Nathaniel BURRUS and Nancy BURRUS dated 7 Jun 1837.  Todd County, Kentucky, Deed Books K-M, 1836-40.  LDS Microfilm No. 355909 (extracted by Diana Gale Matthiesen, 21 Mar 2001).  Most importantly, the indenture gives a list of Henry & Nancy's children. 

7.  Christian County Genealogical Society.  1997.  Christian County, Kentucky, Deed Abstracts of Books G-H-I (1816-1819).  Christian Co. Gen. Soc. (1101 Bethel St.), Hopkinsville, KY 42240.

p. 97	DBI-65. May 12, 1818, from SAMUEL BRADLEY and CATY, his wife, to HENRY BURRESS, for $77.00, 22 A, Waters of Muddy Fork of Little River, S/Samuel Bradley, Caty Bradley. Dower relinq. Rec. 20 May, 1818.
	DBI-66. May 12, 1818, from SAMUEL BRADLEY and CATY, his wife, to HENRY T. BURRESS, for $700.00, 200 A. on the water of Muddy Fork of Little River, bounded by Snelling and Ashby. S/Samuel Bradley, Caty Bradley, dower Reliq. by Caty Bradley. Rec. 20 May, 1818.
p. 108	DBI-172. May 18, 1818, from STEPHEN AHSBY to HENRY BURRESS, for $24.50, a parcel of land on the Waters of Muddy Fork of Little River, (acreage not shown), metes and bounds, S/Stephen Ashby, Rec. July 6, 1818.

Today, the Muddy Fork of the Little River is in northeastern Trigg Co.