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| 1991 || 55,540 || <ref>{{cite book |chapterurl=http://www.cso.ie/en/media/csoie/census/census1991results/volume1/C1991_V1_T20.pdf#page=3 |chapter=20. Alphabetical list of Towns with their population in 1991 |page=167 |format=PDF |series=Census 1991 |volume=1 |title=Population Classified by Area |publisher=CSO |accessdate=6 July 2017}}</ref>
| 1991 || 55,540 || <ref>{{cite book |chapterurl=http://www.cso.ie/en/media/csoie/census/census1991results/volume1/C1991_V1_T20.pdf#page=3 |chapter=20. Alphabetical list of Towns with their population in 1991 |page=167 |format=PDF |series=Census 1991 |volume=1 |title=Population Classified by Area |publisher=CSO |accessdate=6 July 2017}}</ref>
Whereas most Irish boroughs had the modest autonomy of an urban district, Dún Laoghaire had greater powers and was for many purposes practically a county borough independent of Dublin County Council.
The corporation was formed by Section 3 of the Local Government Act (Dublin) 1930 from the four Urban Districts of Dún Laoghaire, Blackrock, Dalkey, and Killiney and Ballybrack. Plans to merge these coastal authorities were first made in 1903, a bill to effect this was being drawn up in 1924, but this was abandoned when the Government of Ireland proposed their own legislation to reorganise local government in County Dublin. The corporation headquarters was in Dún Laoghaire Town Hall.
Under the Local Government (Dublin) Act, 1993, Dublin County Council was divided in three. The Corporation of Dún Laoghaire was abolished and its powers transferred to the new Dún Laoghaire–Rathdown County Council. This act took effect in 1994. The Dún Laoghaire Vocational Education Committee, originally created for the Borough of Dún Laoghaire, remained in existence until 2013.
"20. Alphabetical list of Towns with their population in 1991". Population Classified by Area. Census 1991. Vol. 1. CSO. p. 167. {{cite book}}: |access-date= requires |url= (help); |format= requires |url= (help); External link in |chapterurl= (help); Unknown parameter |chapterurl= ignored (|chapter-url= suggested) (help)
"19. Alphabetical list of towns with their population in 1986". Population. Census 1986. Vol. 1. CSO. p. 171. {{cite book}}: |access-date= requires |url= (help); |format= requires |url= (help); External link in |chapterurl= (help); Unknown parameter |chapterurl= ignored (|chapter-url= suggested) (help)
"20. Alphabetical list of Towns with their population in 1981". Population. Census 1981. Vol. 1. CSO. p. 162. {{cite book}}: |access-date= requires |url= (help); |format= requires |url= (help); External link in |chapterurl= (help); Unknown parameter |chapterurl= ignored (|chapter-url= suggested) (help)
"15. Alphabetical list of Towns with legally defined boundaries.". Population. Census 1979. Vol. 1. CSO. p. 92. {{cite book}}: |access-date= requires |url= (help); |format= requires |url= (help); External link in |chapterurl= (help); Unknown parameter |chapterurl= ignored (|chapter-url= suggested) (help)
"19. Alphabetical list of towns, with populations". Population. Census 1971. Vol. 1. CSO. p. 160. {{cite book}}: |access-date= requires |url= (help); |format= requires |url= (help); External link in |chapterurl= (help); Unknown parameter |chapterurl= ignored (|chapter-url= suggested) (help)
"19. Alphabetical list of towns, with populations". Population. Census 1966. Vol. 1. CSO. p. 169. {{cite book}}: |access-date= requires |url= (help); |format= requires |url= (help); External link in |chapterurl= (help); Unknown parameter |chapterurl= ignored (|chapter-url= suggested) (help)
"15. Alphabetical list of Towns, with populations, 1961". Population, area and valuation of each DED and each larger Unit of Area. Census 1961. Vol. 1. CSO. p. 148. {{cite book}}: |access-date= requires |url= (help); |format= requires |url= (help); External link in |chapterurl= (help); Unknown parameter |chapterurl= ignored (|chapter-url= suggested) (help)
"14. Alphabetical list of towns, with populations, 1956.". Population. Census 1956. Vol. 1. CSO. p. 142. {{cite book}}: |access-date= requires |url= (help); |format= requires |url= (help); External link in |chapterurl= (help); Unknown parameter |chapterurl= ignored (|chapter-url= suggested) (help)
"14. Alphabetical list of towns with populations, 1951". Population, area and valuation of each DED and each larger Unit of Area. Census 1951. Vol. 1. CSO. p. 145. {{cite book}}: |access-date= requires |url= (help); |format= requires |url= (help); External link in |chapterurl= (help); Unknown parameter |chapterurl= ignored (|chapter-url= suggested) (help)
"13. Alphabetical List of Towns, with Populations, 1946". Population, area and valuation of each DED and each larger Unit of Area. Census 1946. Vol. 1. CSO. p. 135. {{cite book}}: |access-date= requires |url= (help); |format= requires |url= (help); External link in |chapterurl= (help); Unknown parameter |chapterurl= ignored (|chapter-url= suggested) (help)
"13. Alphabetical List of Towns, with Populations, 1936". Population, Area and Valuation of each DED and each larger Unit of Area. Census 1936. Vol. 1. CSO. p. 139. {{cite book}}: |access-date= requires |url= (help); |format= requires |url= (help); External link in |chapterurl= (help); Unknown parameter |chapterurl= ignored (|chapter-url= suggested) (help)