The Republic of Ireland originally had 26 counties, of which Dublin was divided into 3 counties and 1 county borough, and two counties were established in other areas, so there were actually 31 county districts.
1. County-level cities
1. Dublin City (English: Dublin; Irish: Baile Átha Cliath) is the capital of the Republic of Ireland, Dublin County and the largest city, near the center of the east coast of the island of Ireland, located at the mouth of the River Liffey in Dublin County, the center of the Dublin region. Dublin has been the capital city of Ireland since the Middle Ages and is the largest city on the island of Ireland. Due to the concentration of many high-tech enterprises, it is known as the Silicon Valley of Europe.
2. Cork (Irish: Corcaigh, pronounced [korkɪɟ] meaning "swamp", English: Cork) is the second largest city in the Republic of Ireland and the third largest city on the island of Ireland (after Dublin and Belfast). It is the main city and administrative centre of County Cork and the largest city in Munster Province. After the expansion of the Cork metropolitan area in 2019, the Greater Cork metropolitan area has a population of about 305,000 people, and the Greater Cork metropolitan area covers an area of about 820 square kilometers. Cork began as a settlement founded by a monk and was pioneered by the Vikings around 915. For supporting the House of York in the War of the Roses, Cork earned the nickname "City of Rebellion", as the Cork people often referred to it as the "true capital of Ireland", and their own "rebels". The city was built on both sides of the River Leigh. The River Lee runs through the city and flows into the Celtic Sea from Cork Harbour (one of the largest natural harbours in the world and one of Ireland's large ports).
3. Galway (Irish: Gaillimh), a city on the Atlantic coast of the western Republic of Ireland, is also the seat of County Galway. Located on the banks of the River Corrib and with a population of 79,934, it is the sixth largest city in Ireland.
II. County
4. County of Fingal (Irish: Contae Fhine Gall) is a county in Ireland, historically part of Dublin County, Leinster Province, established in 1994. Located on the coast of Ireland in the eastern part of the island of Ireland. It has an area of 448.07 km² and a population of 239,813. The capital is Sots.
5. County of South Dublin (Irish: Contae Átha Cliath Theas) is a county in Ireland, historically part of Dublin County, Leinster Province, established in 1994. Located in the eastern part of the island of Ireland. It has an area of 222.74 km² and a population of 246,919. The capital city is Tara.
6. County of Dun Laoghaire-Rathdown (Irish: Dún Laoghaire–Ráth an Dúin) is a county in Ireland that was historically part of Dublin County in Leinster Province and was established in 1994. Located on the coast of Ireland in the eastern part of the island of Ireland. It has an area of 127.31 km² (the smallest in the country) and a population of 193,668. The capital is Dun Lery.
7. County Wexford (Irish: Contae Loch Garman) is a county in Ireland located in the southeastern part of the island of Ireland. Historically part of the province of Leinster. The Slani River flows diagonally into the sea in this county. It has an area of 2,352 km² and a population of 131,615. The capital is Wexford.
8. County Carlow (Irish: Contae Cheatharlach) is a county in Ireland located in the southeastern part of the island of Ireland. Historically part of the province of Leinster. The vast majority of the land is located east of the Barrow River. The county covers an area of 896 km², has a population of 50,349 and has its capital, Carlo.
9. County Kildare (Irish: Contae Chill Dare, meaning "Oak Grove Church") is a county in Ireland located in the eastern part of the island of Ireland. Historically part of the province of Leinster. It has an area of 1,693 km² and a population of 186,075. The capital city of Ness.
10. County Meath (Irish: Contae na Mí), commonly known as The Royal County, is a county in Ireland that historically belonged to the province of Leinster. Located in the eastern part of the island of Ireland, it has a coastline of 10 km. It has an area of 2,342 km² and a population of 162,831. The capital city of Naveen. The World Heritage-listed Boyne Valley is located in the county.
11. County Louth (Irish: Contae Lú), commonly known as The Wee County, is a county in Ireland located on the eastern coast of the island of Ireland, bordering Northern Ireland to the north. Historically part of the province of Leinster. It covers an area of 820 km². The population is 128884 people. The capital is Dundalk.
12. County Longford (Irish: Contae an Longfoirt) is a county in Ireland located in the middle of the island of Ireland. Historically part of the province of Leinster. It is bounded by the Shannon River-Li Lake to the west. It has an area of 1,091,820 km² and a population of 34,361. The capital is Longford.
13. County Westmeath (Irish: Contae na hIarmhí), or County Westmeathí, is a county in Ireland that historically belonged to the province of Leinster. Located in the central interior of the island of Ireland. It has an area of 1,764 km² and a population of 79,403. The capital is Maringa.
14. County Offaly (Irish: Contae uíbh Fhailí) is a county in Ireland located in the middle of the island of Ireland. Historically part of the province of Leinster. It was established in 1556 and named King's County after Philip II, husband of King Mary I, and was seated in Tangan (known as Philipstown until the 19th century). It has an area of 1,999 km² and a population of 70,868 people. The capital is Talamore.
15. County Laois (Irish: Contae Laoise) is a county in Ireland, located in the middle of the island of Ireland, on the upper Barrow and Knoll rivers. Historically part of the province of Leinster. It has an area of 1,719 km² and a population of 69,012 people. The capital is Port Leish.
16. County Kilkenny (Irish: Contae Chill Chainnigh) is a county in Ireland located in the southern part of the island of Ireland. Historically part of the province of Leinster. It is bounded by the Shure River to the south, the Barrow River to the east, and the Knoll River flows through the middle. It has an area of 2,061 km² and a population of 87,394. The capital is Kilkenny. Dan Mo Cave is one of Kilkenny's tourist attractions.