Thomas McGrath + Bridget Quinn of Newcastle and Fourmilewater

I've found the following info about my ancestors Thomas McGrath and Bridget Quinn, who married in 1823 at Newcastle and Fourmilewater.  They and at least some of their children went to Chicago, Illinois, USA around 1860.  Would greatly appreciate any guidance in findng more about this family and the area they were from.  The marriage and baptism records were found on the RootsIreland site.  I am a little confused about the locations of these areas.

Date of Marriage: 15-Jul-1823 
Parish / District: NEWCASTLE AND FOURMILEWATER  County: Co. Tipperary 
Husband Name: Thomas McGrath  
Wife Name: Bridget Quinn 
Husband's Father  Wife's Father 
Name:  McGrath   Quinn 
Witness: Patrick Fennessy and Margaret McGrath 

Baptisms of Children:

Name: John McGrath 
Date of Baptism: 31-Dec-1823 
Address:  Parish/District: NEWCASTLE County Co. Waterford 
Denomination: Roman Catholic 
Father: Thomas McGrath Mother: Brigid Quin 
Sponsor: Patrick Fenesey and Ellen Hickey 
Notes: Apparently died before 1832, as Thomas & Bridget had another son named John.

Name: Edmund McGrath   
Date of Baptism: 05-Jul-1828 
Address:  Parish/District: NEWCASTLE County Co. Waterford 
Denomination: Roman Catholic 
Father: Thomas McGrath 
Mother: Brigid Quin 
Sponsor: Thomas Prendergast and Mary McGrath 
Notes: Married Rosa Fay 1865 in Chicago, Illinois, USA. Died in Chicago 14 Nov 1881.

Name: John Magrath 
Date of Baptism: 29-Feb-1832 
Address:  Parish/District: NEWCASTLE County Co. Waterford 
Denomination: Roman Catholic 
Father: Thomas Magrath 
Mother: Biddy Quinn 
Sponsor: Billy Prendergast and Elle Prendergast 
Notes: Came to U.S. by 1860. Became "Brother Titus", Brother of the Holy Cross at University of Notre Dame, Indiana. Died 14 Nov 1914 in Notre Dame, Indiana.

Name: Mary Magrath 
Date of Baptism: 25-Mar-1834 
Address:  Parish/District: NEWCASTLE  County Co. Waterford 
Denomination: Roman Catholic 
Father: Thomas Magrath 
Mother: Brigid Quinn 
Sponsor: Thomas Hickey and Johanna Cahil 
Notes: Baptism record is the only record found for her.

Name: Honor McGrath   
Date of Baptism: 17-Oct-1836 
Address:  Parish/District: NEWCASTLE County Co. Waterford 
Denomination: Roman Catholic 
Father: Thomas McGrath 
Mother: Brigid Quinn 
Sponsor: Edmund Cahill and Mary Cahill 
Notes: Baptism record is the only record found for her.

Name: Brigid McGrath  
Date of Baptism: 18-Mar-1839 
Address:  Parish/District: NEWCASTLE County Co. Waterford 
Denomination: Roman Catholic 
Thomas McGrath 
Mother: Brigid Quinn 
Sponsor: James Prendergast and Hono Prendergast 
Notes: Went to Chicago, married John Norris (a native of County Tipperay).  Died in Chicago 7 Dec 1921.

Name: James McGrath  
Date of Baptism: 01-Apr-1841 
Address:  Parish/District: NEWCASTLE County Co. Waterford 
Denomination: Roman Catholic 
Father: Thomas McGrath 
Mother: Brigid Quinn 
Sponsor: Tobias Butler and Alice Byrne
Notes: Probably went to Chicago. Is mentioned in his sister Bridget's obituary. 

Name: William McGrath   
Date of Baptism: 01-Nov-1844 
Address: Rathgally Parish/District: NEWCASTLE County Co. Waterford 
Denomination: Roman Catholic  
Father: Thomas McGrath 
Mother: Brigid Quin 
Sponsor : John Hickey and Catherine Hickey 
Notes: Baptism record is the only record found for him.

There is another daughter, Ellen McGrath born c1840, for whom I did not find a baptism.  She went to Chicago and married Edmond Norris, a native of County Tipperary and brother of the John Norris who married her sister Bridget.  Also a daughter Margaret McGrath, also born c1840, who went to Chicago and became a nun, Sister Mary Modesta, at St. Mary's Convent in Notre Dame, Indiana.