Descriptions:

Admiral

Starfish Island
Northwest house of main road.

Ambulance

Vice Point
Shady Palms Hospital

Ocean Beach
Ocean View Hospital

Downtown
Schuman Healthcare Center

Angel

Downtown
2x at the Greasy Chopper.

Baggage Handler

Escobar International
1. West side of terminal, inside airport fence.
2. Just south of the terminal, between the two spokes sticking out.

Banshee

Starfish Island
R* pool house.

Benson

Vice Port
Across from Pay & Spray.

BF Injection

Vice Point
Beach, just SE of Malibu, near the edge of the sand.

Bloodring Banger

Hyman Memorial Stadium
2x South east corner of stadium

Caddie

Ocean Beach
By Lighthouse, after passing over small wooden bridge, look for the large bush 
on right by the water.

Cheetah

Washington Beach
Down in the Washington Beach marina.

Coast Guard

Vice Port
Jump off dock just south of the Ocean Beach-Little Havana Bridge. (boat)

Comet

Leaf Links
Outside of entrance to golf course.

Starfish Island
Go down the street across from mansion driveway.  Turn into the 2nd driveway on the right. Look in the garage.

Cuban Jetmax

Vice Port
Boatyard.  Spawns mission "Checkpoint Charlie."(boat)

Deluxo

Little Havana
Sunshine Autos after 1st car list.

Dinghy

Vice Point
Behind white condos north of Star View Heights (building destroyed during "Demolition Man"). (boat)

Faggio

Washington Beach
Following the road the Malibu is on, go about a block south of the VC Police Department.

FBI Washington

Downtown
Alley near Well-stacked Pizza and Rock City.

Firetruck

Downtown
Downtown Fire Station

Flatbed

Vice Port
Go directly south from Pay & Spray until you see it.

Freeway

Vice Point
After coming off bridge from Prawn Island, the Freeway is against the building at the first right.

Gang Burrito

Prawn Island
Driveway of green house all the way north.

Hermes

Ocean Beach
South past Rafael's.  At the little underground mall to the left, take a right and there's your car.

Hotring Racer

Little Havana
Sunshine Autos after 4th list.

Hunter

Fort Baxter Air Base
Back wall. (100 packages)

Ocean Beach
Helipad about 1 block south of Ammunation. (100 packages & finish story.)

Infernus

Vice Point
Inside North Point Mall on podium.

Starfish Island
Next to stairs of Diaz/Vercetti Estate.

Kaufman Cab

Little Haiti
Inside Kaufman Cabs.

Landstalker

Downtown
Dirt bike track. Spawns mission "Test Track."

Linerunner

Vice Port
Parking lot in between the two sides of the road at Port entrance.

Marquis

Ocean Beach
Ocean Beach Marina. (boat)

Vice Point
At end of the mission "Checkpoint Charlie".(boat)

Maverick

Starfish Island
Top of Vercetti Estate. (copter)

Downtown
Top of Hyman Condo.

Mr. Whoopee

Little Havana
Inside Cherry Popper's Ice Cream Factory (must buy factory)

Oceanic

Ocean Beach
Ocean View Hotel

Packer

Prawn Island
Rear of movie lot.

Escobar International Airport
Between two spokes sticking out of airport.

Vice Port
Port Authority

Patriot

Little Haiti
Hangar at Phil's.

Prawn Island
South east corner of the film studios, near south gate.

PCJ 600

Vice Point
Go south from Malibu. At corner, turn left into the grass and up next to the building, you'll see the bike.  This spawns the mission "PCJ Playground."

Ocean Beach
1. Along fence at the Marina.
2. In covered garage north of Pay & Spray.

Downtown
Smash glass in Howlin Pete's Biker Emporium.

Phoenix

Starfish Island
Go down street across from Vercetti mansion.  Turn right when you see an alley to the right. At its end, turn right and go through the gate. Car in the garage.

Pizza Boy

Vice Point
Behind Well-Stacked Pizza

Little Haiti
Behind Well-Stacked Pizza

Downtown
Next to Well-Stacked Pizza

Police

Vice Point
Front of Police Station

Washington Beach
Behind Police Station

Downtown
Next to Police Station

Little Havana
Front of Police Station

Police Maverick

Downtown
Top of Police Station. (copter)

Pony

Vice Port
At split in large islands main coastal road going south, take the left direction. You'll see the Pony up on the right next to a weapon pickup.

Predator

Leaf Links
At base of Leaf Links-Little Haiti Bridge.

Reefer

Ocean Beach
Ocean Beach Marina. (boat)

Rio

Ocean Beach
Ocean Beach Marina. (boat)

Rhino

Fort Baxter Air Base
Obtain 90 Packages.

Rumpo

Vice Point
Parking lot behind the Malibu Club.

Sabre Turbo

Little Havana
Sunshine Autos after 2nd list.

Sanchez

Downtown
Dirtbike Track. Spawns mission "Trial by Dirt."

Sandking

Little Havana
Sunshine Autos after 3rd list.

Sea Sparrow

Starfish Island
Back of Vercetti Estate. (obtain 80 packages) (copter)

Sentinel

Little Havana
Sunshine Autos.

Sentinel XS

Escobar/Little Havana Border
Lot next to VC Transport Police Building on road to airport.

Skimmer

Prawn Island
Film Studio Docks. (plane)

Sparrow
(All spawn checkpoint missions)

Ocean Beach
Top of building to the south side of Pay & Spray. Use jump to get it. (copter)

Vice Point
Through arch doorway south of Links View Heights.  1st yard on left. (copter)

Downtown
On bottom level of building used during the mission "G-Spotlight." (copter)

Little Haiti
Block north-east of Auntie Poulet's. Billboard on roof says "Move Over Miami." Use jump to get to it. (copter)

Speeder

Ocean Beach
Ocean Beach Marina. (boat)

Squallo

Vice Port
Boatyard. Also spawns mission "Checkpoint Charlie."

Stallion

Ocean Beach
Top of parking garage where you saw Lance during "Guardian Angels". Spawns the mission "Cone Crazy." 

Stretch

Starfish Island
Next to steps of Diaz/Vercetti Estate.

Stinger

Starfish Island
West house of middle intersection.

Top Fun

Vice Point
1. Top of North Point Mall lot.
2. Beach ditrkbike track.

Escobar International Airport
East side near Freight and Cargo Terminal.

Trashmaster

Little Haiti
Inside City Scrap.

Tropic

Vice Point
Dock just north of Links View Bridge. (boat)

VCN Maverick

Downtown
Top of VCN News building. (copter)

Voodoo

Little Haiti
Across from Auntie Poulet's.

Zebra Cab

Little Haiti
Inside Kaufman Cabs.