...and with him went the Prince of Dol Amroth in his shining mail. For he and his knights still held themselves like lords in whom the race of N’menor ran true.
I always had the impression the the Dunedain from the North (can't recall exactly how many there were of them) were the only peoples in M-E where the N’menorean blood still ran true. Yet Faramir and Denethor's blood almost run true to N’menor, yet Boromir's not so much.
Tolkien early on in the LOTR hints that there are only a handful of 'pure bred' (for lack of better term) N’menoreans, but then during ROTK he gives me the impression there could be almost a thousand(s) people in M-E whom's blood does/almost runs true.
Even though Gondor was created by the N’menoreans over time they mingled with lesser folk, however, I believe it's safe to say there are still handful of citizens of Gondor whom still have much of N’menor blood in them.
It sounds like most of Dol Amroth's occupants are full blooded N’menorean. At least the knights from there are:
...Imrahil, Prince of Dol Amroth, kinsman of the Lord, with gilded banners bearing his token of the Ship and the Silver Swan, and a company of knights in full harness riding grey horses, and behind them seven hundreds of men at arms, tall as lords, grey-eyed, dark-haired, singing as they came.
My question being is how many people in M-E would have full N’menorean blood?