word | | Constitution |
| January | Burkina Faso | 2 June 1991 approved by referendum, 11 June 1991 formally adopted; last amended January 2002 |
| January | Cameroon | 20 May 1972 approved by referendum, adopted 2 June 1972; revised January 1996 |
| January | Congo, Republic of the | approved by referendum 20 January 2002 |
| January | Czech Republic | ratified 16 December 1992, effective 1 January 1993 |
| January | Equatorial Guinea | approved by national referendum 17 November 1991; amended January 1995 |
| January | Gambia, The | approved by national referendum 8 August 1996; effective 16 January 1997 |
| January | Gibraltar | 5 June 2006; came into force 2 January 2007 |
| January | Guatemala | 31 May 1985, effective 14 January 1986; note - suspended 25 May 1993 by former President Jorge SERRANO; reinstated 5 June 1993 following ouster of president; amended November 1993 |
| January | Honduras | 11 January 1982, effective 20 January 1982; amended many times |
| January | India | 26 January 1950; amended many times |
| January | Italy | passed 11 December 1947, effective 1 January 1948; amended many times |
| January | Jordan | 1 January 1952; amended many times |
| January | Kazakhstan | first post-independence constitution adopted 28 January 1993; new constitution adopted by national referendum 30 August 1995 |
| January | Liberia | 6 January 1986 |
| January | Maldives | adopted 1 January 1998 |
| January | Mali | adopted 12 January 1992 |
| January | Nauru | 29 January 1968; amended 17 May 1968 (Constitution Day) |
| January | Nepal | 9 November 1990; note - a new interim constitution was promulgated in January 2007; the November 2006 peace agreement calls for the election of a constituent assembly to draft a new permanent constitution |
| 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; reforms 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 | Saint Helena | 1 January 1989 |
| January | Samoa | 1 January 1962 |
| January | Senegal | adopted 7 January 2001 |
| January | Slovakia | ratified 1 September 1992, effective 1 January 1993; changed in September 1998 to allow direct election of the president; amended February 2001 to allow Slovakia to apply for NATO and EU membership |
| 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 | Tonga | 4 November 1875; revised 1 January 1967 |
| January | Uruguay | 27 November 1966, effective 15 February 1967; suspended 27 June 1973, new constitution rejected by referendum 30 November 1980; two constitutional reforms approved by plebiscite 26 November 1989 and 7 January 1997 |
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