Didn't find them in Miami County but this might be your family.
Census Records: Indiana, 1860
Bigger, John Gender : Male
Age : 10 Year(s)
Ethnicity : White
Birthplace : Ohio
County / Township : Boone / Sugar Creek
Post Office : Thorntown
State : IN
Census Page / Line Number : 0915 / 13A
National Archive Series / Microfilm Number : M653 / 245
Real / Personal Property : $0 / $0
Literate : Yes
Family Number : 0823
Dwelling Number : 0844
Bigger, Margaret E. Gender : Female
Age : 12 Year(s)
Ethnicity : White
Birthplace : Ohio
County / Township : Boone / Sugar Creek
Post Office : Thorntown
State : IN
Census Page / Line Number : 0915 / 12A
National Archive Series / Microfilm Number : M653 / 245
Real / Personal Property : $0 / $0
Literate : Yes
Family Number : 0823
Dwelling Number : 0844
Bigger, Mary Gender : Male
Age : 34 Year(s)
Ethnicity : White
Birthplace : Ohio
County / Township : Boone / Sugar Creek
Post Office : Thorntown
State : IN
Census Page / Line Number : 0915 / 11A
National Archive Series / Microfilm Number : M653 / 245
Real / Personal Property : $0 / $0
Literate : Yes
Family Number : 0823
Dwelling Number : 0844
Bigger, Mary E. Gender : Female
Age : 5 Year(s)
Ethnicity : White
Birthplace : Ohio
County / Township : Boone / Sugar Creek
Post Office : Thorntown
State : IN
Census Page / Line Number : 0915 / 15A
National Archive Series / Microfilm Number : M653 / 245
Real / Personal Property : $0 / $0
Literate : Yes
Family Number : 0823
Dwelling Number : 0844
Bigger, Mathew Gender : Male
Age : 40 Year(s)
Ethnicity : White
Birthplace : Ohio
County / Township : Boone / Sugar Creek
Post Office : Thorntown
State : IN
Census Page / Line Number : 0915 / 10A
National Archive Series / Microfilm Number : M653 / 245
Job / Job Code : Farmer / 001 - Farmer
Real / Personal Property : $0 / $0
Head of Household : Y
Literate : Yes
Family Number : 0823
Dwelling Number : 0844
Bigger, Robert Gender : Male
Age : 1 Year(s)
Ethnicity : White
Birthplace : Indiana
County / Township : Boone / Sugar Creek
Post Office : Thorntown
State : IN
Census Page / Line Number : 0915 / 17A
National Archive Series / Microfilm Number : M653 / 245
Real / Personal Property : $0 / $0
Literate : Yes
Family Number : 0823
Dwelling Number : 0844
Bigger, Samuel Gender : Male
Age : 8 Year(s)
Ethnicity : White
Birthplace : Ohio
County / Township : Boone / Sugar Creek
Post Office : Thorntown
State : IN
Census Page / Line Number : 0915 / 14A
National Archive Series / Microfilm Number : M653 / 245
Real / Personal Property : $0 / $0
Literate : Yes
Family Number : 0823
Dwelling Number : 0844
Bigger, William Gender : Male
Age : 4 Year(s)
Ethnicity : White
Birthplace : Indiana
County / Township : Boone / Sugar Creek
Post Office : Thorntown
State : IN
Census Page / Line Number : 0915 / 16A
National Archive Series / Microfilm Number : M653 / 245
Real / Personal Property : $0 / $0
Literate : Yes
Family Number : 0823
Dwelling Number : 0844
Sandy Taylor
Proud Daughter of a United States Marine - Guarding the streets of Heaven
Proud Mother of a United States Marine - SSgt Chad M. Culbertson - deployed
----- Original Message -----
From: "remarksk" <kskramer(a)wcoil.com>
To: <INMIAMI-L(a)rootsweb.com>
Sent: Sunday, April 06, 2003 3:25 PM
Subject: [INMIAMI-L] 1860 Census Lookup
Would anyone have the index or printout for
the 1860 census for Miami Co. I am looking for
a Matthew Bigger b. Ohio abt 1829 and wife
Mary, also born ohio abt 1820/31.
Thanks
Sue