He was the eldest son of Sir Kildare Borrowes, 3rd Baronet and his wife Elizabeth Dixon, daughter of Sir Richard Dixon. In 1709, he succeeded his father as baronet. Borrowes represented Harristown in the Irish House of Commons between 1721 and 1727. Subsequently he sat for Athy until his death in 1741.
On 18 March 1720, Borrowes married Mary Pottinger, daughter of Captain Edward Pottinger. They had three sons. Borrowes died at Calverstown and was succeeded in the baronetcy by his only surviving son Kildare Borrowes, 5th Bt..
The family's surname is sometimes spelled Burrowes.
- "Leigh Rayment - Irish House of Commons 1692-1800". Retrieved 6 April 2009.
- Burke, John (1832). A Genealogical and Heraldic History of the Peerage and Baronetage of the British Empire. vol. I (4th ed.). London: Henry Colburn and Richard Bentley. p. 130.
- "Leigh Rayment - Baronetage". Retrieved 6 April 2009.
- Lodge, John (1789). Mervyn Archdall, ed. The Peerage of Ireland or A Genealogical History of the Present Nobility of that Kingdom. vol. I. Dublin: James Moore. p. 130.
- "ThePeerage - Sir Walter Borrowes, 4th Bt". Retrieved 6 April 2009.
|Parliament of Ireland|
|Member of Parliament for Harristown
With: Alexander Graydon
|Member of Parliament for Athy
With: Marcus Anthony Morgan
James FitzGerald, Baron Offaly
Marcus Anthony Morgan
|Baronetage of Ireland|
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