Donegal, Fermanagh, Cavan, Longford, Roscommon and Sligo.
Louth, Down, Monaghan, Tyrone
Derry and Down
Antrim, Armagh and Louth.
Derry and Down
Limerick and Cork are the counties that border county Kerry.
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San Diego County and Imperial County are the California counties that border Mexico.
Monmouth County, Ocean County, and Atlantic County.
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Hancock county, Harrison county, and Jackson county. The three Southernmost counties that border the Gulf of Mexico.
Tazewell County in Illinois borders Peoria County to the north, Woodford County to the east, Mason County to the south, and Fulton County to the west.
5 counties border the county of Kilkenny. They are Laois, Wexford, Carlow, Tipperary and Waterford.
Randolph County in North Carolina is bordered by the following counties: Guilford County to the north, Davidson County to the northeast, Montgomery County to the southeast, Moore County to the south, and Chatham County to the west.
Owen, Scott. Woodford, Andersom. Shelby and Henry counties.
Well you have Laois which is surrounded by counties that do not have a sea border.