Both couples were in Perry Co., IN for the 1850 census and then in Wayne Co., IA for the 1860 census. They aren't living next door to each other, but I think it isn't just a coincidence.

1850 U.S. Census, Perry Co., IN
Page 418, Oil Township
Lines 33 - 40 Dwelling 1037, Family 1052
Enumerated on September 30th, 1850 by Thomas J Custer, Ass't Marshal

Hammock, George 32 M W Farmer KY Can't read or write
Hammock, Elizabeth 30 F W KY
Hammock, Francis 12 F W IN Attended School
Hammock, John 10 M W IN Attended School
Hammock, Philip 08 M W IL Attended School
Hammock, Daniel 07 M W IN
Hammock, Lewis 05 M W IN
Hammock, Taylor 02 M W IN


1860 U.S. Census, Wayne Co., IA
Washington Township, Cambria Post Office
Page 463, Sheet 79, Lines 07 - 17, Dwelling 576, Family 542
Enumerated on July 5th1860 by Wm Boyle, Ass't Marshal

Hammack, George 43 M W Farmer KY $1200 $795
Hammack, Elizabeth 39 F W KY
Hammack, John 19 M W Farmer IN Attended School
Hammack, Phillip 18 M W Farmer IL Attended School
Hammack, Daniel 15 M W Farmer IN Attended School
Hammack, Lewis 14 M W Farmer IN Attended School
Hammack, Sarah 09 F W IN Attended School
Hammack, Mahalah 07 F W IN
Hammack, Elizabeth 05 F W IL
Hammack, William 03 M W IA
Hammack, James M 08/12 M W IA

1850 U.S. Census, Perry Co., IN
Page 365, Troy Township
Lines 25 - 32, Dwelling 310, Family 311
Enumerated on August 27th, 1850 by Thos. J Cutter

Miller, John 40 M W Laborer KY
Miller, Mahala 34 F W KY
Miller, Mary 15 F W IN
Miller, John 13 M W IN
Miller, Sarah 11 F W IN
Miller, Charlotte 06 F W IN
Miller, Susanna 03 F W IN
Miller, Emily 01 F W IN

1860 U.S. Census, Wayne Co., IA
Page 405, Benton Township (Sheet 21), Corydon Post Office
Lines 33 - 39, Dwellin g168, Family 150
Enumerated on June 12th, 1860 by W Boyle, Ass't. Marshal

Miller, John 52 M W Farmer $40 $100 KY
Miller, Mahalah 44 F W KY
Miller, John H 21 M W Farmer $ - $60 IN
Miller, Charlotte 14 F W IN Attended School Within Year
Miller, Amanda 12 F W IN Attended School Within Year
Miller, Emily 09 F W IN Attended School Within Year
Miller, Clarissa L 07 F W IN Attended School Within Year