(Note: the DMV shows all of these cars as being registered the way they might be in the countries your RPs are set in, so they get the car names wrong a lot.)
Harrison15:
Arizona vanity "R33 900" - Nissan Other 1996
Arizona regular "CKN4758" - Toyota Supra 1993
Arizona vanity "2JZ LOL" - not in use, last used Toyota Supra 1997
Arizona regular "ZNS-732" - not in use, last used Pontiac G8 2008
Smurf:
Washington vanity "EVOLVO" - Volvo 850
Washington regular "HFN-935" - BMW 3-Series
Marcus915:
Nagoya (Aichi) "名古屋51 ち 2793" - Nissan Silvia
Nagoya (Aichi) "名古屋54 つ 7804" - Nissan 180SX 1991
Nagoya (Aichi) "名古屋32 た 8946" - Toyota Chaser 1997
FamousMan:
New York vanity "FCKSWITIT" - Nissan 240SX 1989
Nagoya (Aichi) "名古屋33 つ 9058" - reserved / ordered but not used
Coprone:
Hiroshima "広島59 た 3604" - Toyota Prius
Fukushima "福島500 さ 7012" - Mitsubishi FTO
Fukushima "福島300 さ 8055" - Toyota Supra
Adrian1099:
Yokohama "横浜337 に 0314" - Toyota Mark II
Jaziba:
UK vanity "L3GAL M3" - BMW M3 1990
ramalhinho07:
California regular "6MBV006" - Honda Civic 1991
CALLmeSCOOBY:
Croatia "CK 972-GA" (sorry, "ČK 972-GA" couldn't be done with the font used) - Audi A4
Croatia "CK 200-SX" - Nissan 200SX
SyX_FuRy:
Osaka "大阪502 た 0875" - Nissan Silvia
Haku:
Ontario vanity LVHI RDLO - Nissan 240SX 1990
Ontario vanity ROTARDED - Nissan 240SX 1991
Ontario vanity BRKWGON - BMW 3-Series 1998
Ontario vanity CRO WNS - dealer plate?
Doge:
Gunma "群馬509 め 4370" - Toyota Sprinter Trueno
Crook:
Nagoya (Aichi) "名古屋53 ら 8261" - Nissan Silvia 1995
JdmSly:
Arizona vanity "AYYLMAO" - reserved
420blazescope:
California vanity "IMNOTGAY" - Mazda Miata
California vanity "SLOWASFK" - Nissan Sentra 2007
Kazern:
Tasmania custom "ZUTUTU" - Nissan 200SX
Tasmania custom "CYA BRO" - not used yet
Tasmania custom "THE 180" - Nissan 200SX
Guppy:
New Zealand "VTEC" - Honda Civic 1990
Koriyama (Fukushima) 郡山56 す 1389 - Mazda Roadster 1996
LoganC:
Yamanashi "山梨327 ち 9932" - Chevrolet Camaro 1972
Ey papa:
Tama (Tokyo) "多摩302 ね 2263" - Toyota Supra
Suginami (Tokyo) 杉並504 り •583 - Honda Integra 2003
Tama (Tokyo) "多摩300 ね 9227" - Toyota Mark II
Suginami (Tokyo) "杉並39 ら 0597" - Nissan Skyline
ThatBoostedGuy:
California regular "9YFG693" - Mazda Mazdaspeed3
California regular "5GTV347" - Toyota Corolla
Arizona regular "CPA3919" - Ford Mustang 2005
Arizona regular "673-JCB" - Ford Mustang 2001
California vanity "SHWIFTY" - Chevrolet Corvette
Ontario regular "CZ4A 483" - Mitsubishi Lancer
Ontario vanity "2JZYACHT" - Lexus GS300 2000
JoaoCruzDR:
Portugal "49-83-HB" - BMW 3-Series
Gr1jkee:
Osaka "大阪50 ね 3851" - Nissan 180SX
Tama "多摩55 Y 6431" - Mitsubishi FTO
BlackRedGold:
California vanity "DSC LOL" - BMW 3-Series 2005
Jdm_boy14:
Portugal "58-52-JJ" - BMW 3-Series 1998
Daniel:
Germany Dingolfing "DGL-PZ 235" - BMW 5-Series 1993
Phonexius:
Bosnia and Herzegovina "A12-A-345" - Alfa Romeo 155
Germany "MK BS 1312" - Nissan Skyline
Germany "MK SX 1994" - Nissan 200SX
Germany "MK JZ 3000" - Toyota Supra
Germany "MK AA 418" - Audi A4
Germany "MK WR 571" - Subaru Impreza
dxg1997:
Indiana vanity "2SLO4U" - Nissan Other 2001
SHAN3`:
Jamaica "1876 JA" - Honda Integra 2001
Johny_Bravo:
Italy "XV 374ZG" - Alfa Romeo 155 1993
Italy "KF 733FJ" - Audi RS2 1995
Hyped:
California vanity "HAT3R" - Nissan Other 1980
California vanity "LILZILA" - Nissan Other 1980
BossMan:
Sweden vanity "MY08VIGG" - Saab 9-3
HomerHarbi:
Spain "9327 BNM" - VW Bora 2001 Mazda MX-5 1995
Spain "9645 MWM" - Lexus IS300 2002
Portugal "15-85-ZA" - Lexus GS300 2003
Ward:
Spain "M-2214-V" - Opel Kadett 1992
rodasmendes:
Portugal "64-96-LT" - Volkswagen Golf 1984
Lagano:
Slovenia "GO NX-167" - Honda Civic 1984
Slovenia "GO X3-D05" - Mazda Xedos 6 1997
Jdm_Racer:
California vanity "JDM240SX" - not used
California vanity "GTR-R33" - not used
Suginami (Tokyo) "杉並300 な 6530" - Nissan Skyline 1995
Suginami (Tokyo) "杉並50 も 3136" - Nissan 180SX
Tama (Tokyo) fake "多摩37 と TT13B" - Mazda RX-7
Nerima (Tokyo) fake "練馬58 な AEJDM" - Toyota Sprinter Trueno
Shinagawa (Tokyo) fake "品川50 ろ JDM86" - Toyota Sprinter Trueno
Suginami (Tokyo) fake "杉並52 は 240SX" - Nissan 180SX
Nerima (Tokyo) fake "練馬58 る RB-T" - Nissan Silvia
Shinagawa (Tokyo) fake "品川56 む JDMX5" - Mazda Roadster
Yokohama (Kanagawa) fake 横浜555 む 22B - Subaru Impreza
Yokohama (Kanagawa) 横浜34 ら 0666 - Nissan Skyline
dthug69:
Florida regular "100 SER" - Honda Civic 1995
Nerima (Tokyo) 練馬55 ま 5438 - Honda Civic
skip:
Ireland Galway regular "98-G-7894" - Toyota Altezza 1998
Osaka 大阪59 て 9085 - Mazda Roadster
pinter03:
Osaka "大阪301 み 2375" - Mazda RX-3
SupyPaw:
Arizona generic "LQC 574" - not used, reserved
Arizona generic "CGA7871" - Chevrolet Camaro 1990
exact:
Solingen (Germany) "SG KI 4346" - Kia Other 2010
ThaGhost:
Gunma "群馬 50 つ 1855" - Nissan Silvia 2001
Driftphantom:
California vanity "PHANTOM" - Volkswagen Jetta 2002
California regular "7HCA664" - Toyota Supra 2002
NX_ZuZu:
Florida vanity "NO HOPE" - Toyota Corolla 1995
note / kickflip:
North Carolina vanity "FEDUP" - Nissan 240SX
mtx2games:
California regular "4HUM216" - Toyota Supra
California regular "3CDK978" - GMC Sierra 1993
California regular "7YTW645" - Honda Civic 1993
Smokiegun:
California vanity "OVRLOAD" - Mercedes-Benz C-Class 2009
Facepalm:
Greece "EEE-2809" - Toyota Corolla 1995
California "8JQB935" - Mitsubishi 3000GT
MatheusSideways:
California vanity "TRD 96" - Toyota Supra 1996
California vanity "NOTSTOCK" - Toyota Celica 1991
Kornis:
Fujisan "富士山51 ち 9122" - Mitsubishi Lancer Evolution 1999
giacomo1215:
Aichi (Toyohashi) "豊橋50 の 1203" - Mazda Roadster
kryptiikz:
California vanity "UNSAFE" - Mazda Miata 1990
GoverningNick:
California vintage vanity "STNKBUG" - Volkswagen Beetle 1966
rancidman13:
California vintage vanity "DEADHEAD" - Volkswagen Transporter 1963
Ryku220:
Kyoto "京都52 も 3309" - Nissan Silvia
Kobe (Hyōgo) 神戸34 と 5224 - Nissan Skyline
Sufyan Zeroual:
Netherlands "DF-340-Y" - BMW 1-Series
klucifers:
Latvia "IS-318" - BMW 3-Series 1996
Latvia "M-540" - BMW 5-Series 1996
ATOM500:
New York "1ND-IR4A" - BMW 3-Series
New York "DC5-KEVV" - Acura RSX
New York "DE8-SW20" - Toyota MR2
gabrisanyi:
California vanity "TR1PP1N" - BMW 7-Series 1992
California regular "6TPW320" - BMW 3-Series 1996
angrygamer22:
Estonia "S52 B32" - BMW 5-Series
sonyguy699:
Florida "MEESEEKS" - not assigned yet
GTEFGHA:
California "6DGZ261" - Alfa Romeo Other
Nexion:
Illinois X57-5169 - Mazda RX-7
tyretear:
Suginami (Tokyo) 杉並50 さ 3162 - Mazda RX-7
900xXREDLINE:
Arizona vanity "CH00JZ" - Toyota Supra 1998