Bernard Brady of Castletown, County Caven

I am trying to find the location of Castletown, County Cavan but have been unable to do so. Would it perhaps be called something else. I got the name of the town from the obituary of my 3rd great grandfather as written below in the Boone County Democrat. He died 03/March/1908. 
 

Bernard Brady, perhaps the oldest resident of the county and a highly esteemed pioneer resident, answered the final summons at 11:00 o'clock Tuesday night, March 3rd. at his home south of the Fifth ward, after an illness of four weeks duration brought on by a slight accident to his foot last summer that resulted in gangrene poisoning. Mr. Brady had always been one of the most active men in the city and county and had always enjoyed good health until this sickness came upon him, and in his death the community loses one of its best citizens. The funeral services will be held from the Sacred Heart Church at 10:00 o'clock this morning, conducted by Father Sunders, and the remains laid to rest in the catholic cemetery, his last resting place being within sight of his old home.
Bernard Brady was born in Castletown, County Caven, Ireland, March 16, 1810 and would have been ninety eight years old on the 16th of this month.

He came to America in 1845 and lived for a time in New York and Pennsylvania and in 1849 came to Dubuque, lowa and the next year to Ames and shortly afterward to Boone making him one of the earliest settlers of this part of the state. He has since resided here, most of the time engaged in farming and for the past few years lived on his farm south of the Fifth ward and where he passed away. He was married to Miss Ellen Donohoe in Pennsylvania fifty eight years ago and she preceded him in death less than a year ago. To them were born nine children, two of whom, Frank and Rosa, have passed away. He is survived by five sons, Hugh, Edward, Patrick, Bernard and John, and two daughters, Mary and Kate, who are given the earnest sympathy of their many friends in their bereavement.