word | | Constitution |
| January | Nauru | 29 January 1968; amended 17 May 1968 |
| January | Nepal | 15 January 2007 (interim Constitution); note - in April 2008, a Constituent Assembly was elected to draft and promulgate a new constitution by May 2010; the fourth and final deadline extended to May ... |
| January | New Zealand | ... documents, including certain acts of the UK and New Zealand Parliaments, as well as The Constitution Act 1986, which is the principal formal charter; adopted 1 January 1987, effective 1 January 1987 |
| January | Nicaragua | 9 January 1987; revised in 1995, 2000, and 2005 |
| January | Northern Mariana Islands | Constitution of the Commonwealth of the Northern Mariana Islands effective 1 January 1978; Covenant Agreement fully effective 4 November 1986 |
| January | Palau | 1 January 1981 |
| January | Samoa | 1 January 1962 |
| January | Senegal | adopted 7 January 2001; amended many times |
| January | Slovakia | ratified 1 September 1992, effective 1 January 1993; changed September 1998; amended February 2001 note: the change in September 1998 allowed direct election of the president; the amendment of February 2001 allowed ... |
| January | Sweden | 1 January 1975 |
| January | Switzerland | revision of Constitution of 1874 approved by the Federal Parliament 18 December 1998, adopted by referendum 18 April 1999, officially entered into force 1 January 2000 |
| January | Taiwan | adopted 25 December 1946; promulgated 1 January 1947; effective 25 December 1947; amended many times |
| January | Tonga | 4 November 1875; revised 1 January 1967 |
| January | Uruguay | 27 November 1966; effective 15 February 1967; suspended 27 June 1973; revised 26 November 1989 and 7 January 1997 |
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