Trim is a town in County Meath, Ireland. It is situated on the River Boyne and, as of the 2022 census, had a population of 9,563. The town is in a civil parish of the same name. The town is noted for Trim Castle – the largest Norman castle in Ireland. One of the two cathedrals of the United Dioceses of Meath and Kildare – St Patrick's cathedral – is located n…Trim is a town in County Meath, Ireland. It is situated on the River Boyne and, as of the 2022 census, had a population of 9,563. The town is in a civil parish of the same name. The town is noted for Trim Castle – the largest Norman castle in Ireland. One of the two cathedrals of the United Dioceses of Meath and Kildare – St Patrick's cathedral – is located north of the river. Trim won the Irish Tidy Towns Competition in 1972, 1984, 2014 and 2022, and was the joint winner with Ballyconnell in 1974. Trim was historically the county town of Meath, but this title was passed on in 1898 to the larger, neighbouring town of Navan.