Cloonlyon

35 registered freehold parcels lie mostly in Cloonlyon, from 553 m² to 90,807 m² (9.08 ha, 22.44 acres). The dashed line is the townland's boundary. 30 neighbouring parcels touch it.

Download the townland as DXF, in Irish Transverse Mercator metres, with its boundary, parcels and buildings, or as GeoJSON or KML.

No zone of a development plan covers Cloonlyon in the national zoning. Outside zoned towns and villages, the county development plan's rural policies apply to each application.

Source: Tailte Éireann and the Department of Housing (MyPlan), national zoning, CC BY 4.0.

• 5 Aug 2026Conditional

  alterations to the front elevation of the existing dwelling house, comprising the removal of an existing window, the enlargement of the existing opening and the installation of bifolding doors, together with all associated works

  Permission · Mayo County Council, 26179

• 6 Jul 2026Conditional

  retention permission for existing domestic shed as constructed and the minor changes to the existing dwelling house as constructed along with all ancillary site works. Previous Planning Ref. No. P99/115

  Retention · Mayo County Council, 26148

• 15 Sept 2025N/a

  Section 5 Declaration: Replacing window with patio door

  Permission · Mayo County Council, 25385

Source: National Planning Applications, Department of Housing, Local Government and Heritage, CC BY 4.0. Applicants are not shown.

Designated sites

No designated site (Special Area of Conservation, Special Protection Area, Natural Heritage Area or proposed one) touches the townland of Cloonlyon.

Recorded monuments

• MA062-138 Enclosure
  Description

  In pasture, located on a rise on a N-facing slope. The land immediately to S is planted with forestry. This possible rath is shown on the 1837 OS 6-inch map as a circular embanked enclosure (diam. c. 30m); by the time of the 1919 edition the N half of the enclosure had been removed and it is depicted as a hachured semi-circular area (diam. c. 25m NE−SW), curving from E−WSW. It has been levelled; there is no visible trace at ground level. Compiled by: Jane O’Shaughnessy Date of upload: 26 January 2021

Architectural heritage

No building of the National Inventory of Architectural Heritage stands in the townland of Cloonlyon.

Designated sites: National Parks and Wildlife Service. Recorded monuments: Sites and Monuments Record, National Monuments Service. Buildings: National Inventory of Architectural Heritage. Department of Housing, Local Government and Heritage, CC BY 4.0. Works at or in relation to a recorded monument need two months' written notice to the National Monuments Service (National Monuments (Amendment) Act 1994, section 12).

Radon

At the centre of the townland of Cloonlyon, about 1 in 5 homes in this area is likely to have high radon levels. Testing a home

Landslides

The 1:50,000 map rates the landslide susceptibility here as moderately low, low, partly inferred.

Terrain model

LiDAR of the Office of Public Works, flown in 2011, at 2 m: tile OPW_746 (ZIP).

Flooding

The Office of Public Works publishes its flood maps on floodinfo.ie.

Radon Risk Map of Ireland, Environmental Protection Agency, and Landslide Susceptibility Classification, Geological Survey Ireland, both under CC BY 4.0. LiDAR: contains Irish Public Sector Data (Geological Survey Ireland & the Office of Public Works) licensed under a Creative Commons Attribution 4.0 International (CC BY 4.0) licence.

No address of the register names Cloonlyon with five sales or more. The sales of the area are on the page of Co. Mayo.

Name

Cloonlyon · Cluain Laighean

Area

931,635 m² (93.16 ha, 230.21 acres)

Civil parish

Kilbeagh, and its townlands

Barony

Costello

Electoral division

Sonnagh, the unit of the census

Census 2022

1,242 people lived in 457 households in the Sonnagh electoral division. 76% of households owned their home. 32% of homes were built since 2001. 17% of dwellings stood vacant on census night, and 6% were holiday homes.

Neighbouring townlands

Barnalyra, Carn, Kilgarriff West, Killeen, Ranaranny, Tomboholla

Placenames

Cloonlyon on logainm.ie, the Placenames Database of Ireland

Townlands, civil parishes, baronies and electoral divisions, National Statutory Boundaries, Tailte Éireann, CC BY 4.0. Census 2022, Small Area Population Statistics by electoral division, Central Statistics Office, CC BY 4.0. A townland is the smallest land division of Ireland, and the unit of a rural address. Old registers such as the 1901 and 1911 censuses file it under its civil parish and barony.