Status of factions and people in this universe's Fallout portions of Earth

Mojave Wasteland

The Kings - Intact. The King is still alive. Pacer is not.
The Followers of the Apocalypse - Intact
The Brotherhood of Steel - Western Brotherhood intact but battered.
The Enclave - Destroyed with Remnants who had tried to integrate into the NCR, in South America, and possibly some who made it to North Africa by raft.
The NCR - Destroyed and reorganized in the Mojave as part of an independent New Vegas; remains alive in California itself, though severely hit by the Enclave.
Caesar's Legion - In control of former Enclave holdings in America; the capital of the Legion has been moved from Flagstaff, Arizona to Boulder, Colorado
Great Khans - Hurt and unorganized. Papa Khan lives, uncertain of what to do with his tribe.
Mark "Tex" Johnson - Hero of an independent New Vegas.
Boone - A security guard and caravan scout along the highways. Hired out as a guide by a team of Swiss Special Forces troops hunting slavers and eventually joined the Foreign Legion.
Cass - Rebuilds her caravan one more time after evidence of the Van Graff-Crimson Caravan conspiracy was presented to the NCR, though the NCR was destroyed soon after.
Lily - Living peacefully in Jacobstown and takes her medication regularly.
Rex - Received a brain from Lupa, which melds well with his own memories of his time with the Legion. He is eventually taken up by Chancellor Bertinelli during a visit to the consulate in Jacobstown.
Veronica - Ultimately banished by the Brotherhood, she takes up an opportunity at a new life at the consulate in Jacobstown where she repairs old equipment and assists in research on the Nightkin schizophrenia and attempts at reversing the Ghoul condition.
ED-E - Logs taken by both the Followers and the Brotherhood of Steel, which the Brotherhood used to create a small army of eyebots. ED-E itself hangs around New Vegas until taken up by Cassidy Caravans.
Raul - Retired and settled down in outer Vegas where he works as a repairman.
Arcade - Alive and kicking.
Tabitha and the Black Mountain mutants - Tabitha and Rhonda went east, through Caesar's land. Occasionally tales of their exploits found their way back west, though few believed them. Eventually the stories concerning the duo were collected and published, and proved to be quite popular with children. The rest of the Black Mountain mutants made their way to Jacobstown.
Fortification Hill securitrons - Activated and upgraded.
Enclave remnants - Dr. Henry continues work on a cure for the Nightkin schizophrenia, aided by Swiss scientists. Daisy Whitman takes up flying vertibirds again as a result of increased international trade. Orion Moreno is thrilled that the NCR had been thrown out. Cannibal Johnson remain a hermit in a cave. Judah Kreger sticks around in Westside, keeping the Remnants in contact with each other.
The Garretts - Still around
The Crimson Caravan - Still around
The Van Graffs - Wiped out
The Gun Runners - Still in business
The Omertas - Still around
The White Glove Society - Still around and no longer cannibals
The Chairmen - Still around, and even Benny is still alive
The Boomers - Wiped out by the Enclave
The Fiends - Exterminated
Novac - Doing fine with the Enclave gone
Primm - Prospering under Primm Slim's robotic eye
Goodsprings - Virtually ignored by the Enclave in the first place
Bright Followers - Landed far away and have yet to return
Mr. House - Assassinated by the Enclave

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Sierra Madre
Christine -
Dean Domino -
Dog/God -
Elijah -

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Zion Valley
Happy Trails Caravan Company -
Dead Horses -
Sorrows -
White Legs -
Salt-Upon-Wounds -
New Caananites -
Daniel -
Joshua Graham -
Follows Chalk - Left to explore the world and eventually joined the Foreign Legion.
Waking Cloud -

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Big MT
Doctor Mobius -
Doctor Klein -
Doctor 0 -
Doctor 8 -
Doctor Borous -
Doctor Dala -
Toaster -
Light Switches -
Muggy -
Roxie -
The Courier's Brain -
Blind Diode Jefferson -
Sink Central Intelligence -
Sink Auto-Doc -
Book Chute -
Biological Research Station -

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Capital Wasteland

Brotherhood of Steel - Destroyed with refugees in Europe
Rivet City - Taken over by the Enclave, now belonging to the Legion.
Megaton - Nuked
Arefu - Wiped out by the Derscons
Canterbury Commons - Wiped out
Big Town - Wiped out
Tenpenny Tower - Still standing with Tenpenny as the owner.
Roy Phillips and his followers - Wiped out
Grayditch - Overrun by fire ants
Little Lamplight - Still there, though adults were allowed due to them attempting to stay clear of the Enclave. Now under Legion protection.
Oasis - Still there
Agatha - Still there
Sierra Petrovita - Still there
Reilly's Rangers - Wiped out
Vance and his "vampires" - Still around
Underworld - Wiped out
Andale - Wiped out
Paradise Falls - A center for weapons sales
Brotherhood Outcasts - Wiped out
Vault 101 - Still there and those there safe out of respect for Aisha
Amata - Still there
The Overseer - Still there
Butch - Still there
Charon - Dead
Clover - Dead
Fawkes - In Jacobstown
Uncle Leo - In Jacobstown
Jericho - Dead
Star Paladin Cross - Dead
Dogmeat - Died while with Aisha
Sergeant RL-3 - Still around

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The Pitt

Ashur - Still in power as leader of the Pitt, and, as per the agreement with the United Municipalities, freed the slaves there
Wernher - One of the representatives of the United Municipal Council
Midea - One of the representatives of the United Municipal Council
Pitt raiders - Granted amnesty and allowed to act as a paramilitary force in conjunction with the military. Those that continue to raid/enslave are hunted down, arrested, and possibly executed.
Trogs - Five years after incorporation with Hew, ZPCI scientists uncover a cure for the Trog condition.

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Point Lookout

Desmond - ?
Professor Calvert - ?
Tribals - ?
Swampfolk - ?
Nadine - ?
Plik - ?
Obadiah Blackhall - ?

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Mothership Zeta
Sally - Blown up by Star Destroyer
Paulson - Blown up by Star Destroyer
Elilot - Blown up by Star Destroyer
Somah - Blown up by Star Destroyer
Toshiro - Blown up by Star Destoyer

NCR - They're still in California, but battered and bruised right now. They might be a problem if they manage to reorganise in the future.

Great Khans - They're around, but unorganized.

Tex - My character from F: NV

Boone, Cass, Lily, Rex, Veronica, ED-E, Raul, Tabitha - Probably around, but not a major player. In other words, I ain't playing them, but if someone else wants to have them around in New Vegas itself and RPs them, fine by me.

Is Papa Khan alive? If so, do you mind having them move over and take Oregon and Washington? Those two states would be Khan territory, while California is the NCR, and Nevada is independent.

Are the King and Pacer still alive? The Crimson Caravan and Van Graffs? The Gun Runners? The Garretts? What happened to the three families? Novac? Goodsprings? Primm? Are Fortification Hill and the Legate's Camp abandoned? The Boomers were wiped out, right? The Fiends were exterminated, right? The Bright Followers?

I'm guessing a consulate would be sent to the Legion capital, as well as the NCR's, and if it happens, the Khan's capital, too.

What's the population of all these places? According to Fallout Wiki, the population of the NCR in 2240 was 700,000 people.

I have plans for the Khans later on, but they don't become independent.

The NCR might manage to retake California later on if they can get organized and that's a pretty big if. They really had their ass handed to them by the Enclave.

The King is alive. Pacer is not. Crimson Caravan is still running. Van Graffs are gone. Gun Runners are still there. Garrets are still there. All three families are on the Strip. The White Glove Society are not cannibals anymore. Most towns are now fine since the Enclave left. The Fiends and Boomers aren't there anymore. The Fort and Legate's Camp are now abandoned and nothing remains there but that bunker. The Bright Followers went off to the stars and have yet to return.

I don't have actual populations yet, but New Vegas territory likely has around 1 million. The Legion has around 20 million now with the population of Enclave citizens that flipped sides. The actual NCR is maybe 5,000 people scattered around California.

Who's the Sheriff in Primm? Primm Slim? Do you like what I wrote as the fates of the companions?

I don't have a problem with the fates, no. As to the Sheriff in Primm, doesn't matter to me.

As to the capitol of the Legion, I'm going to call it Boulder, CO instead of Flagstaff.

Primm Slim it shall be, because it is funnier.

Added more queries, mostly about the East coast. Not as many because I haven't played Fallout 3 as thoroughly.

I think Pittsburg is actually in Hew's territory. The Pitt would be annexed as a municipality, then?

Possibly.

Capital Wasteland

Brotherhood of Steel - Destroyed with refugees in Europe
Rivet City - Taken over by the Enclave, now belonging to the Legion.
Megaton - Nuked
Arefu - Wiped out by the Derscons
Canterbury Commons - Wiped out
Big Town - Wiped out
Tenpenny Tower - Still standing with Tenpenny as the owner.
Roy Phillips and his followers - Wiped out
Grayditch - Overrun by fire ants
Little Lamplight - Still there, though adults were allowed due to them attempting to stay clear of the Enclave. Now under Legion protection.
Oasis - Still there
Agatha - Still there
Sierra Petrovita - Still there
Reilly's Rangers - Wiped out
Vance and his "vampires" - Still around
Underworld - Wiped out
Andale - Wiped out
Paradise Falls - A center for weapons sales
Brotherhood Outcasts - Wiped out
Vault 101 - Still there and those there safe out of respect for Aisha
Amata - Still there
The Overseer - Still there
Butch - Still there
Charon - Dead
Clover - Dead
Fawkes - In Jacobstown
Uncle Leo - In Jacobstown
Jericho - Dead
Star Paladin Cross - Dead?
Dogmeat - Died while with Aisha
Sergeant RL-3 - Still around

I'll sort out the others later.

I don't want to bother with Mothership Zeta. I'm just going to say it got blown up by a Star Destroyer, killing all the abductees on board, before it could abduct Aisha.

Sierra Madre
Christine - ?
Dean Domino - ?
Dog/God - ?
Elijah - ?

Zion National Park
Follows-Chalk - ?
Waking Cloud - ?
Sorrows - ?
Dead Horses - ?
Daniel - ?
New Canaanites - ?
Joshua Graham - ?
Happy Trails Caravan - ?
White Legs - ?
Salt-Upon-Wounds - ?

EDIT: Would you mind if I have Follows-Chalk, Boone, Defender Morrill, and Knight Finley end up as members of the Second Foreign Parachute Regiment?