(Montenegro came to my attention with an unusually high percentage of its population in its national group of Mensa...around 1/600, 10 times the US, 13 times Germany, and a thousand times Mexico...roughly)
This gives new dimension to the discussion of SixCalifornias, Jefferson, Superior, etc.

In regards to the population, in the formation of Jefferson or any other political entity, there is nothing to prevent the duplication of this:
The status of the union between Montenegro and Serbia was decided by the referendum on Montenegrin independence on 21 May 2006. A total of 419,240 votes were cast, representing 86.5%
of the total electorate. 230,661 votes (55.5%) were for independence and 185,002 votes (44.5%) were against.[19] The 45,659 difference narrowly surpassed the 55% threshold needed to
validate the referendum under the rules set by the European Union.
According to the electoral commission, the 55% threshold was passed by
only 2,300 votes. Serbia, the member-states of the European Union, and
the permanent members of the United Nations Security Council all recognised Montenegro's independence.
The 2006 referendum was monitored by five international observer missions, headed by an Organization for Security and Co-operation in Europe (OSCE)/ODIHR team, and around 3,000 observers in total (including domestic observers from CDT (OSCE PA), the Parliamentary Assembly of the Council of Europe (PACE),
the Congress of Local and Regional Authorities of the Council of Europe
(CLRAE) and the European Parliament (EP) to form an International
Referendum Observation Mission (IROM). The IROM—in its preliminary
report—"assessed compliance of the referendum process with OSCE
commitments, Council of Europe commitments, other international
standards for democratic electoral processes, and domestic legislation." Furthermore, the report assessed that the competitive pre-referendum
environment was marked by an active and generally peaceful campaign and
that "there were no reports of restrictions on fundamental civil and
political rights."
On 3 June 2006, the Montenegrin Parliament declared the independence of Montenegro,[20] formally confirming the result of the referendum. Serbia did not object to the declaration.