Teester
According to http://maps.openstreetmap.ie/oocmaps.html?zoom=15&lat=53.39075&lon=-6.4756&layers=000B0TFFTTF, this area is the townland of Jarretstown (admin_level=10): http://www.openstreetmap.org/relation/4434135

According to the Memorial Atlas of 1901, it is located within the civil parish of Dunboyne (civil parishes have no admin_level): http://maps.openstreetmap.ie/oocmaps.html?zoom=12&lat=53.38086&lon=-6.45897&layers=0000BFFFTFF, http://www.openstreetmap.org/relation/5148092  

It is also located in the electoral district (admin_level=9) of Dunboyne according to OSi Opendata: http://maps.openstreetmap.ie/os_opendata.html?zoom=14&lat=53.39349&lon=-6.47113&layers=0BFFTFTFFFF, http://www.openstreetmap.org/relation/6960903

There is a townland of Dunboyne about 5km north which is also part of the same parish and electoral district.

There is also a second Jarretstown (http://www.openstreetmap.org/relation/4587462) to the south which is part of a different county and electoral division.  In all sources, these are considered different administrative entities in spite of the same name, and they have been added to the map as such.

Hope this makes things clear. It's certainly a little complicated!