Mixed People are assumed to be Dunadan/Beorian and/or Dunadan/Gwathuirim.

Location          People            From      To
--------------------------------------------------------------
North Lowlands    Borians              1?   1636? (See note 1)
Emyn Uial         Dunedain             1     863?
Annuminas         Dunedain             1     863? (See note 2)
                  Mixed People         1     863? (See note 2)
North Downs       Dunedain             1    1974
                  Mixed People         1    1974
Fornost Erain     Dunedain             1    1974
                  Mixed People         1    1974
Angmar            Angmarians           1?   1974
                  Orcs              1300?   1974
                  Trolls            1300?   1974
East Lowlands     Easterlings?         1?   1300? (See note 3)
                  Harfoots           1050   1300
                  Fallohides         1150   1300
                  Nandor?              1?   1300? (See note 4)
                  High Elves?          1?   1300? (See note 4)
Ettenmoors        Trolls               1?   3021
                  Giants?           1300?   3021? (See note 5)
North Rhudaur     Dunedain             1    1409
                  Hill-folk            1    1409
                  Angmarians        1409    1409
Trollshaws        Hill-folk            1    1409
                  Angmarians        1409    1409
Imladris          High Elves           1    3021
Shire             Dunedain             1     863? (See note 6)
                  Beorians             1?    863?
                  Mixed People         1?    863?
                  Harfoots          1601    3021
                  Fallohides        1601    3021
                  Stoors            1630    3021
Midlands          Beorians             1    1974
                  Mixed People         1    1974
                  Harfoots          1300    1636? (See note 7)
                  Fallohides        1300    1636? (See note 7)
Buckland          Stoors            2340    3021
Tyrn Gorthad      Beorians             1    1636
                  Dunedain             1    1636
                  Mixed People         1    1636
Bree-land         Gwathuirim           1    3021
                  Harfoots          1300    3021
                  Fallohides        1300    3021
The Angle         Dunedain             1    1409
                  Stoors            1150    1356
                  Angmarians        1409    1409
South Downs       Dunedain             1    1409
Minhiriath        Dunedain             1    1636
                  Gwathuirim           1    1636? (See note 8)
                  Mixed People         1    1636? (See note 8)
Tharbad           Dunedain             1    2912
                  Gwathuirim           1    2912  (See note 9)
                  Mixed People         1    2912  (See note 9)  
--------------------------------------------------------------
Terms:
North Lowlands -- The lands north of Emyn Uial and the North Downs
East Lowlands  -- The lands between the Weather Hills and Mitheithel
North Rhudaur  -- The lands north of the Trollshaws to the Ettenmoors
Midlands       -- The lands north of Bree, south of Fornost, from
                  Baranduin to the Weather Hills
Minhiriath     -- The lands between Baranduin and Gwathlo, as far
                  east as the Greenway
Notes:
1)  The Borians were Easterlings, Swarthy Men, who settled in northern
    Eriador in the First Age.  The Folk of Bor passed north around the
    Ered Luin and settled in Lothlann, north of Himring, as subjects of
    Maedhros.  Although this clan or tribe was wiped out during the
    Nirnaeth Arnoediad, a note in THE WAR OF THE JEWELS indicates that
    other clans related to the Folk of Bor remained in Eriador, and they
    were the ancestors of the northernmost Men to live in Eriador in the
    Second Age.
    That these Borians would have survived into the Third Age is purely
    speculative, but if they did, it seems probable they either became
    the Lossoth (who were said to be a remnant of the Forodwaith of the
    First Age) or else they died out some time before the final war with
    Angmar.  If they died out, the latest probable date for their demise
    seems to be 1636, when the Great Plague swept across Eriador, although
    Tolkien says the plague lessened in intensity as it passed north.
2)  "The Heirs of Elendil" in THE PEOPLES OF MIDDLE-EARTH suggests,
    in the entry for Earendur, that Annuminas was deserted when his
    sons divided Arnor among themselves.
3)  The "Easterlings" is intended to represent descendants of those
    Easterlings who fled Beleriand at the fall of Thangorodrim.  Their
    descendants could have included the Men of Angmar, the Hill folk
    who deposed the Dunedain in Rhudaur, and any Men who might have
    settled in these lowlands.  There is no textual evidence that
    Men actually lived in the East Lowlands.  However, Valandur (602-
    652), the eighth King of Arnor, died a violent death in 652.  His
    death seems to imply some sort of war was fought.  The most logical
    foe would be a tribe or nation of Easterlings living east or
    north of Arnor (though the presence of Elves in the East Lowlands
    would seem to imply the region was not unfriendly to Arnor -- see
    note 4).
4)  Tolkien indicates that Elves continued to live throughout Eriador
    in at least the early part of the Third Age.  Although many would
    have been part of Wandering Companies, the society of the Wandering
    Companies is not documented (were they permanently nomadic?), and
    it is not clear that all would have been.  If they required lands
    of their own, the East Lowlands appear not to have been part of
    Elendil's realm, and a great number of Elves could have dwelt
    there beside Arnor at least until the end of the Second Age.  In
    the Third Age, these should have comprised the majority of the Elves
    of Eriador who acknowledged Elrond's leadership.  The most likely
    time for their departure from this region would be when Angmar
    arose and threatened the Dunedain and Imladris.
5)  The presence of Giants is purely speculative, based on some
    etymological evidence and the suggestion in THE HOBBIT that Giants
    were not native to the Misty Mountains.  When they arrived and
    from whence they might have come are not known.  But if the Giants
    tended toward evil, then they may have arrived when the Lord of
    the Nazgul colonized the north and established the realm of Angmar.
6)  Some of Elendil's people settled between Baranduin and Lhun.  But
    when the lands became deserted is not clear.  I have inferred that
    the abandonment of Annuminas implies these lands were deserted by
    then.
7)  Tolkien does not say that Hobbits actually settled in the Midlands,
    but he does say that they migrated westward and many settled at
    Bree.  Since not all settled at Bree, the others must have lived
    somewhere else.  By 1300 the Hobbits appear to have begun learning
    how to build, and they would not have all been living in tunnels.
    When the non-Bree settlements vanished is not given, either.  There
    are three logical times when these settlements could have vanished:
    1600, when the Shire was colonized; 1636, during the Great Plague;
    1974, when Angmar destroyed Arnor.  The Great Plague seems the
    least likely, but if the communities had already been depleted by
    emigration, their populations could have died out more easily in the
    plague.
8)  Some men continued to live in Minhiriath after the Great Plague, but
    Tolkien says they were very few.  We know the Dunedain of Cardolan
    all perished in the plague, so the survivors must have been Gwathuirim
    or Mixed People.  Since Tolkien says no other settlements of Men
    survived close to the Shire (outside of Bree) by the end of the Third
    Age, the Minhiriathians must have lived in isolated homesteads, much
    as the Folk of Haleth who settled south of Brethil in the First Age
    did.  This strongly implies they were Gwathuirim.
    Tolkien says in the Gwathlo essay (published in UNFINISHED TALES in
    the appendix to "Of the History of Galadriel and Celeborn" that there
    were a few secretive hunter folk still living in Minhiriath's woods
    at the end of the Third Age (probably close to the river and/or the
    sea, since most of Minhiriath was open plains).  The story of the
    Great Plague given in Appendix A to THE LORD OF THE RINGS implies
    that Minhiriath suffered more than other parts of Cardolan, so some
    people may have survived in the South Downs, or maybe the implication
    just refers to Tharbad.
9)  Tharbad was a Numenorean port, but it seems probable there were some
    Gwathuirim who settled there, and that they mingled with the Dunedain.