— born in NJ or PA:
  9?  (Daughter A) ELY, b. 1784-90
10?  (Daughter B) ELY, b. 1784-90

— born in Shamokin Twp., Northumberland Co., PA:
11.  Asher ELY, b. 26 Nov 1788 

1.  Family Quest Archives:  Pennsylvania Federal Census 1790:  Montgomery, Westmoreland (part), Allegheny, Washington, Bedford, Franklin, York, Northumberland, Mifflin (part), and Philadelphia Counties.  Heritage Quest  CD M637-9:  There are no ELYs (or var.) in Northumberland Co. — the Northumberland census is not organized by township, so I checked every entry for the entire county.  There is a George EAGLE, but that's the closest I found.

2a.  Census Index:  U.S. Selected Counties, 1800 (Broderbund CD-312).  Please see my WARNING regarding use of this database — the numerical data have the genders switched.  See also George ELY of Earl Township as an example. 

1800

Ely, George, Sr.

PA

Northumberland Co.

p. 670

02001-0111100

2b.  1800 Census Images (online at Ancestry.com; Image #2 of 6; extracted by Diana Gale Matthiesen):

1800

PA

Northumberland Co.

p. 670

Ely George Senr

01111-02001-00

These data indicate:

No. & Sex	Age Class	Therefore Born	Individuals Inferred
1 male	10-15	1784-1790	= Asher (b. 1788)
1 male	16-25	1774-1784	= Samuel (b. 1782)
1 male	26-44	1755-1774	= John? (b. ca. 1770)
1 male	45 or over	in or bef. 1755	= George (b. 1745)
2 females	10-15	1784-1790	= Daughter? B  = Daughter? A
1 female	45 or over	in or bef. 1755	= Susannah (b. 1746)

Most of the older children were married at this point.  The younger girls may not be their children.  Is the older male really John?  He is said to have died in Indiana in 1800.  Also in Northumberland Co.:  sons George ELY, Jr. and Caleb ELY. 

3a.  Census Index:  U.S. Selected Counties, 1810 (Broderbund CD-313):

1810

Ely, George

Northumberland Co.

Shamokin Twp.

p. 265

Also in Northumberland Co.:  sons George ELY, Jr. and Caleb ELY — and a Jacob ELY, in East Buffalo Twp. (who is he?). 

3b.  Family Quest Archives:  Pennsylvania Federal Census 1810:  Northumberland, Potter, Somerset, Venango, and Warren Counties. Heritage Quest CD M252-53.

1810

PA

Northumberland Co.

Shamokin Twp.

p. 265

Ely George

Far[mer]

00111-00011-00

These data indicate:

No. & Sex	Age Class	Therefore Born	Individuals Inferred
1 male	16-25	1784-1794	= Asher (b. 1788)
1 male	26-44	1765-1784	= Samuel (b. 1782)
1 male	45 or over	in or bef. 1765	= George (b. 1745)
1 female	26-44	1765-1784	= ?
1 female	45 or over	in or bef. 1765	= Susannah (b. 1746)

If the younger female was one of their widowed daughters, we would expect some children in the household.  Could she be Samuel's wife, with no children yet because they are newly married?

4.  Census Index:  U.S. Selected Counties, 1820 (Broderbund CD-314):  only one George found, who is presumably the son of our subject.  Susanna is living with her son, Asher.

5.  Reuben P. Ely, Warren S. Ely, and Daniel B. Ely.  1910. An Historical Narrative of the Ely, Revell, and Stacye Families.  Fleming H. Revell, Co., New York
(online at GenealogyLibrary.com).  Biographical sketch of Col. George ELY.

6.  LDS.  Family Search: Internet Genealogy Service:  AF - Ancestral File (online at FamilySearch.org).

7.  Messages in thr Ely Family Genealogy Forum (online at GenForum.com).