Niger:
republic
Nigeria:
republic transitioning from military to civilian rule
Niue:
self-governing parliamentary democracy
Norfolk Island:
NA
Northern Mariana Islands: commonwealth; self-governing with locally elected governor, lieutenant governor, and legislature
Norway:
constitutional monarchy
Oman:
monarchy
Pakistan:
federal republic
Palau:
constitutional government in free association with the US;
the Compact of Free Association entered into force 1 October 1994
Panama:
constitutional democracy