— born in Christian Co., KY:
  9.  Mary "Polly" RASCO, b. 1796/7
10.  John RASCO, b. 1800/1 

With the exception of Laban and Mary, all the birthdates of the children in the secondary sources appear to be guesses.  In the case of John, secondary sources give his birthdate as 1788 or 1794, but three censuses have him born between 1800 and 1801 (see his page). 

1.  Jordan R. Dodd, ed.  1993.  KY, NC, TN, VA, WV Marriages:  Early to 1850.  Liahona Research, Orem, UT (Broderbund CD-229):

Rasco, William

Harrel, Rachel

13 Dec 1777

Bertie Co., NC

2.  Census Index:  Colonial America, 1607-1789 (Broderbund CD-310):

1757	Rasco, William	NC	Bertie Co.
1786 State Census	Rascow, William	NC	Hyde Co.	Gibbs Company	p. 1

Neither of these would appear to be our subject, though the 1757 record is probably his father.

3.  Census Index:  U.S. Selected Counties, 1790 (Broderbund CD-311):

1790

Rascoe, William

NC

Bertie Co.

p. 14

03-05-04-00-00

These data indicate:

Gender and Type	Age Class	Therefore Born	Individuals Inferred
3 free white males	16 or over	in or bef. 1774	= William (b. 1750s) = ? = ?
5 free white males	15 or under	1774-1790	= Son A = Jesse (b. ca. 1779-80) = Freline (b. ca. 1780-83) = Laban (b. 1784) = William (b. ca. 1788-90)
4 free white females	all ages	in or bef. 1790	= Rachel = Daughter A = Phereby (b. ca. 1778-80) = Margaret (b. ca. 1786)

If the marriage date for William and Rachel is correct, then the two older males cannot be their children, though they could be William's sons from a previous marriage.

4.  Census Index:  U.S. Selected Counties, 1800 (Broderbund CD-312):  the 1800 KY census was lost; tax lists are substituted on the CD.

1800 Tax List

Rosco, William

KY

Christian Co.

He is the only ROSCO/ROSCOE on the CD.

5.  Discussion of the 1810 Census:

It is both difficult to believe there are two Rachael RASCOs or, at the same time, to believe they are not the same Rachael RASCO, accidentally enumerated twice (it happens).  On p. 92, Rachael is two lines from Jesse FORT (her son-in-law), and on p. 101, she is on the next line from Jesse FORT, who also appears to have been enumerated twice.  On the other hand, all the other neighbors are different, and the numbers are just different enough to make you wonder if there aren't two of each.  But if so, their existence is a complete surprise.  The record for Rachael's son, William (five lines away), is also bizzare.  Do we have a drunk for an enumerator or something?

5a.  Census Index:  U.S. Selected Counties, 1810 (Broderbund CD-313).  Please see my WARNING regarding use of this database (the numerical data have the genders switched). 

1810	Rasco, Rachal	KY	Christian Co.	p.  92	01101-1030003
1810	Rasco, Rachal	KY	Christian Co.	p. 101	01003-4000003

The "4" in the second record is definitely a "1" (see next sources for readings of the pages).

5b.  1810 Census Index and Digital Images (online at Ancestry.com; Image #41 of 66; extracted by Diana Gale Matthiesen):

1810

KY

Christian Co.

p. 92

Rachal Rasco

10300-01101-03

These data indicate:

No. & Sex	Age Class	Therefore Born	Individuals Inferred
1 male	9 or under	1800-1810	= John (b. 1800-02)
3 males	16-25	1784-1794	=
1 female	10-15	1794-1800	= Mary (b. 1797)
1 female	16-25	1784-1794	=
1 female	45 or over	in or bef. 1765	= Rachel
3 slaves	all ages	in or bef. 1810	= names unknown

There really shouldn't be all these older children at home; they are off and married.  Rachel's household is here listed on the next line down from Jesse FORT, but no other kin are near.

5c.  1810 Census Index and Digital Images (online at Ancestry.com; Image #50 of 66; extracted by Diana Gale Matthiesen):

1810

KY

Christian Co.

p. 101

Rachal Rasco

10000-01003-03

These data indicate:

No. & Sex	Age Class	Therefore Born	Individuals Inferred
1 male	9 or under	1800-1810	= John (b. 1800-02)
1 female	10-15	1794-1800	= Mary (b. 1797)
3 females	45 or over	in or bef. 1765	= Rachel = ? = ?
3 slaves	all ages	in or bef. 1810	= names unknown

In terms of children still in the home, this record is more in keeping with what we would expect Widow Rachel's household to contain — except who are the other two older women?  The neighbors make more sense, as well.  Rachel's household is listed two lines from Jesse FORT, who is two lines from Micajah FORT, who is next door to Rachel's son, William RASCO.

6.  1820 Census Index and Digital Images (online at Ancestry.com; Image #15 of 23; extracted by Diana Gale Matthiesen):

1820

KY

Christian Co.

p. 43

Rachel Rasco

000100-00101-0-200-1010-0101

These data indicate:

No., Race, Gender	Age Class	Therefore Born	Individuals Inferred
1 white male	19-25*	1794-1801	= John (b. 1800/1)
1 white female	16-25	1794-1804	= Lucy (b. 1802)
1 white female	45 or over	in or bef. 1775	= Rachel
2	people in agriculture
1 male slave	13 and under	1806-1820	= name unknown
1 male slave	26-44	1775-1794	= name unknown
1 female slave	14-25	1794-1806	= name unknown
1 female slave	45 or over	in or bef. 1775	= name unknown
*In the 1820 Census, the third column is age class 16-18 and the fourth column is age class 16-25; therefore, any individual in column three is duplicated in column four.  By subtracting the number in column three from the number in column four, you can create an age class "19-25."

Listed 12 lines down from her son-in-law, Jesse FORT, who is next door to Garrison "Garry" FORT, who is next door to Micajah FORT.  The only other RASCO in Christian Co. is Rachel's son, William.

7.  Anon.  1990.  Logan County, Kentucky, Taxpayers, 1792-1799.  T.L.C. Genealogy, Miami Beach, FL:  not found.

8.  Anon.  1991.  The 1795 Census of Kentucky [as constructed from tax lists].  T.L.C. Genealogy, Miami Beach, FL (said to include every extant tax list from the state of Kentucky for the year 1795):  not found.

9.  WorldConnect (online at RootsWeb.com).

10.  LDS.  Family Search: Internet Genealogy Service: Pedigree Resource File (index to CDs online at FamilySearch.org).

11.  LDS.  Family Search: Internet Genealogy Service:  IGI - International Genealogical Index (online at FamilySearch.org).

12.  Messages in the Harrell Family Genealogy Forum (online at GenForum.com).