Notes
- “Longest on register” is determined by the earliest recorded entry date.
- Lists use each database’s Current register only filter where available. Databases without a reconciliation checkbox use their active/all-current rows.
- Councils covered: 30 of 31.
Longest-current site in each council
Ranked by completed years on the register, highest first, as of 15 September 2026. Ties are ordered by earliest entry date.
- Leitrim: DS18 — Clooncorrick, Carrigallen — Entered: 1991-06-19 — Years: 35
- Westmeath: 20 — Buildings on Mullingar Road, Kilbeggan — Entered: 1991-07-02 — Years: 35
- Mayo: DS16/14 — Church Street, Crossmolina — Entered: 1991-07-12 — Years: 35
- Limerick City & County: DS-004-91 — 1 Wellesley Lane, Limerick — Entered: 1991-12-13 — Years: 34
- Cork City: DSP 696 — 42 Corn Market Street — Entered: 1993-01-15 — Years: 33
- Tipperary: ENV-C-97-201 — Old Technical School, Clogheen — Entered: 1998-07-14 — Years: 28
- Waterford City & County: DS23003 — Gate Lodge, Factory Road — Entered: 1999-12-16 — Years: 26
- Cork County: KMMD/DS/15 — Westside of road between Tullylease and Freemount, Site No. 3 — Entered: 2002-08-05 — Years: 24
- Offaly: DS-122 — Kilcormac Road, Gallen, Ferbane — Entered: 2003-10-06 — Years: 22
- Sligo: DS 118 — Westgardens/Market Street, Sligo, Building C — Entered: 2003-10-21 — Years: 22
- Wexford: DER2014-016 — 2A Mary Street, Wexford — Entered: 2004-01-28 — Years: 22
- Kilkenny: DS 03-26 — Beggars Cross, Johnstown — Entered: 2004-02-11 — Years: 22
- Longford: 76/00 — Little Water Street, Longford — Entered: 2006-02-08 — Years: 20
- Dublin City: DS250 — 144 Harold’s Cross Road, Dublin 6W — Entered: 2007-06-08 — Years: 19