How many people needed to settle an area before applying for statehood?

The Ordinance of 1784, drafted by Thomas Jefferson and passed by Congress (April 23, 1784), divided the territory into a handful of self-governing districts. It stipulated that each district could send one representative to Congress upon its attaining a population of 20,000, and it would become eligible for statehood when its population equaled that of the least-populous existing state. (This ordinance was superseded by the Ordinance of 1787.)

Assemblies do not have written codes of laws. laws are matters for magistrates and courts, not assemblies. codes of law are things such as civil law, criminal law, and constitutional law. what assemblies have are procedures regarding debating, voting and other business they might carry out.  also note that rome had three assemblies: the assembly of the soldiers, the assembly of the tribes, and the plebeian councils.