By Amendment of the Act in 1947, a Legislative Council comprising seven official and six elected members with The Administrator as President was created to make laws for the peace, order and good government of the Territory. Composition of the Legislative Council was changed by further amendment in 1959 to provide for six official members, three nominated non-official members and eight elected members and for an Administrator's Council to advise the administrator.
The Act was further amended in 1974 to provide for a Legislative Assembly comprising nineteen elected members and for a Speaker to be one of those members elected by the Members. Laws passed by the Assembly were presented to the Administrator for assent. The Administrator was required to reserve laws on specific subjects for the pleasure of the Governor-General who was empowered to assent, withhold his assent or refuse his assent in part to such laws, or return them to the Assembly with recommended amendments.
In 1977, the Commonwealth Government commenced a programme of transferring executive powers to the Legislative Assembly. On 1 January 1977, a separate Northern Territory Public Service was created and administrative powers related to a number of State type activities such as police, fire brigades, local government and correctional services were transferred. Positions of Executive members were created with those members exercising ministerial-type powers in respect of transferred matters and forming an Executive Council to replace the Administrator's Council.
On 1 July 1978, the Northern Territory (Self-Government) Act came into force establishing the Northern Territory as a body politic under the crown. This act continued in force the existing Legislative Assembly and created offices of Ministers of the Territory who comprise the Executive Council of the Northern Territory. The Office of Administrator appointed by the Governor-General remained. The Administrator's present function is to administer the Territory on behalf of the Government of the Northern Territory in respect of matters transferred from the Commonwealth to the Northern Territory and on behalf of the Commonwealth in respect of matters retained by the Commonwealth.
A Northern Territory Government comprising Ministers of the Territory was established with full responsibility for a wide range of transferred powers administered through a Northern Territory Public Service and a Treasury. A Northern Territory flag was raised for the first time on 1 July 1978.
Laws passed by the Legislative Assembly are presented to the Administrator who acts with the advice of the Territory Government in respect of transferred powers and with the advice of the Commonwealth in respect of matters not transferred.
Major matters not transferred on 1 July 1978 were mining of uranium and other prescribed substances; Aboriginal land matters; health; education; and the Supreme Court. Powers in respect of health, education and the Supreme Court were progressively transferred from the Commonwealth to the Northern Territory Government.
At the end of 1979 the only major powers retained by the Commonwealth in the Northern Territory were those relating to rights in respect of Aboriginal land and the mining of uranium and other prescribed substances. Although remaining a Territory of the Commonwealth and still subject to laws made under section 122 of the Constitution, the Northern Territory is in most respects self-governing.
| Series Id | Series Title | Series Date Range | Number of Units | Public Access | Location |
| NTRS 686 | Register of burials at Palmerston (Darwin) Cemetery, Goyder Road | 1885 - 1984 | 4 | Restricted | Darwin (NTAC) |
| NTRS 3808 | Reference copy of Palmerston burial register | 1885 - 1984 | 1 | Open | Darwin (NTAC) |
| NTRS 3809 | Master preservation copy of Palmerston burial register | 1885 - 1984 | 1 | Restricted | Darwin (NTAC) |
| NTRS 896 | General correspondence files, annual single number series | 1910 - 1941 | 2 | Agreement Pending | Darwin (NTAC) |
| NTRS 687 | Register of burials and gravesite leases, Gardens Road | 1919 - 1957 | 1 | Open | Darwin (NTAC) |
| NTRS 1335 | Master microfilm (silver halide negative) of cemetery register | 1919 - 1957 | 1 | Restricted | Darwin (NTAC) |
| NTRS 2605 | Reference microfilm (silver halide positive) of cemetery register | 1919 - 1957 | 1 | Agreement Pending | Darwin (Danala) |
| NTRS 4827 | Digital copy of Register of burials and gravesite leases | 1919 - 1957 | 1 | Open | Darwin (NTAC) |
| NTRS 4870 | Minutes of Licensing Bench of Central Australia and related papers | 1927 - 1937 | 2 | Agreement Pending | Alice Springs |
| NTRS 4658 | Papers of the Chief Warden and Warden, Alice Springs | 1928 - 1941 | 1 | Agreement Pending | Alice Springs |
| NTRS 3901 | Correspondence files, annual single number series | 1933 - 1999 | 113 | Agreement Pending | Darwin (NTAC) |
| NTRS 15 | Administrative and legal records | 1940 - 1974 | 2 | Agreement Pending | Darwin (NTAC) |
| NTRS 856 | Reports on timber production at Snake Bay, Melville Island | 1948 - 1949 | 1 | Agreement Pending | Darwin (NTAC) |
| NTRS 1468 | Municipal service records and correspondence (Tennant Creek) | 1949 - 1960 | 0 | Agreement Pending | Alice Springs |
| NTRS 1595 | Folders of interstate legislation | 1950 - 1970 | 0 | Agreement Pending | Darwin (NTAC) |
| NTRS 1510 | Darwin plans of sanitary drainage | c 1951 - 1963 | 2 | Agreement Pending | Darwin (NTAC) |
| NTRS 3225 | Report of the working party for the administration and control of the Northern Territory in an emergency | 1951 - 1951 | 1 | Agreement Pending | Darwin (NTAC) |
| NTRS 3658 | Children's registers | 1951 - 1999 | 2 | Agreement Pending | Darwin (NTAC) |
| NTRS 241 | Northern Territory annual reports | 1953 - 1967 | 2 | Open | Darwin (NTAC) |
| NTRS 523 | Floor plan of "The Residency" (Government House), Darwin | 1956 - 1956 | 1 | Agreement Pending | Darwin (NTAC) |
| NTRS 4575 | Painting of NTA Bus Service | 1959 - 1959 | 1 | Open | Darwin (NTAC) |
| NTRS 1467 | Correspondence files, annual single number series with "TD" prefix (Tennant Creek) | 1960 - 1969 | 0 | Agreement Pending | Alice Springs |
| NTRS 4529 | The Territorian, newspaper | 1963 - 1967 | 1 | Open | Darwin (NTAC) |
| NTRS 4917 | 'The Times' newspaper | 1965 - 1966 | 1 | Open | Alice Springs |
| NTRS 830 | Correspondence and newspaper clippings (John Armstrong England) | 1974 - 1983 | 3 | Agreement Pending | Darwin (NTAC) |
| NTRS 1748 | Attendance books | 1974 - 1989 | 0 | Agreement Pending | Darwin (NTAC) |
| NTRS 1637 | Photographic copyprints of Darwin during term as Administrator | 1976 - 1983 | 1 | Open | Darwin (NTAC) |
| NTRS 484 | Photograph of "The Residency" (Government House), Darwin | 1978 - 1978 | 1 | Agreement Pending | Darwin (NTAC) |
| NTRS 2420 | General administration files | 1979 - 2001 | 96 | Agreement Pending | Darwin (NTAC) |
| NTRS 1753 | Correspondence relating to Aboriginal matters | 1980 - 1992 | 1 | Agreement Pending | Darwin (NTAC) |
| NTRS 1754 | Correspondence files and speeches | 1980 - 1992 | 4 | Agreement Pending | Darwin (NTAC) |
| NTRS 1089 | Speeches of Commodore Eric Johnston | 1981 - 1989 | 3 | Open | Darwin (NTAC) |
| NTRS 1113 | Invitations and visits by Commodore Eric Johnston | 1981 - 1988 | 30 | Agreement Pending | Darwin (NTAC) |
| NTRS 1114 | Invitations and visits to townships and Aboriginal communities by Commodore Eric Johnston | 1981 - 1988 | 2 | Agreement Pending | Darwin (NTAC) |
| NTRS 1115 | Invitations and visits to cattle stations by Commodore Eric Johnston | 1981 - 1988 | 2 | Agreement Pending | Darwin (NTAC) |
| NTRS 1116 | Patronage files of Commodore Eric Johnston | 1981 - 1988 | 4 | Agreement Pending | Darwin (NTAC) |
| NTRS 1117 | Articles prepared for the 'Administrator's Column' (Commodore Eric Johnston) | 1981 - 1988 | 2 | Agreement Pending | Darwin (NTAC) |
| NTRS 1118 | Files relating to official functions at Government House | 1981 - 1989 | 1 | Agreement Pending | Darwin (NTAC) |
| NTRS 1119 | General correspondence and patronage files of Mrs Johnston | 1981 - 1988 | 4 | Agreement Pending | Darwin (NTAC) |
| NTRS 1120 | Correspondence of Commodore Eric Johnston | 1981 - 1989 | 11 | Agreement Pending | Darwin (NTAC) |
| NTRS 1146 | Correspondence files and memoranda of Commodore Eric Johnston | 1981 - 1989 | 10 | Agreement Pending | Darwin (NTAC) |
| NTRS 1743 | Scrapbook (Commodore Eric Johnston) | 1981 - 1989 | 1 | Agreement Pending | Darwin (NTAC) |
| NTRS 1745 | List of speeches (Commodore Eric Johnston) | 1981 - 1989 | 1 | Agreement Pending | Darwin (NTAC) |
| NTRS 1749 | Appointment diaries (Commodore Eric Johnston) | 1982 - 1989 | 2 | Agreement Pending | Darwin (NTAC) |
| NTRS 1746 | Invitations and visits (Justice JH Muirhead) | 1989 - 1992 | 6 | Agreement Pending | Darwin (NTAC) |
| NTRS 1747 | Patronage files (Justice JH Muirhead) | 1989 - 1992 | 6 | Agreement Pending | Darwin (NTAC) |
| NTRS 1750 | Appointment diaries (Justice JH Muirhead) | 1989 - 1992 | 1 | Agreement Pending | Darwin (NTAC) |
| NTRS 1751 | Presentation files (Justice JH Muirhead) | 1989 - 1992 | 1 | Agreement Pending | Darwin (NTAC) |
| NTRS 1752 | Functions files (Justice JH Muirhead) | 1989 - 1992 | 2 | Agreement Pending | Darwin (NTAC) |
| NTRS 2422 | Scrapbook (Justice JH Muirhead AC QC) | 1989 - 1993 | 1 | Agreement Pending | Darwin (NTAC) |
| NTRS 2421 | Scrapbook (The Hon Austin Asche, AC QC) | 1993 - 1996 | 1 | Agreement Pending | Darwin (NTAC) |
| NTRS 2424 | Scrapbooks (Dr Neil Conn) | 1997 - 2000 | 1 | Agreement Pending | Darwin (NTAC) |
| NTRS 2618 | Functions files (John Anictomatis AO) | 2000 - 2003 | 12 | Agreement Pending | Darwin (NTAC) |