Rivals No More

Zipcar

Founded:1999

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First location: Boston

Fleet:3,500 vehicles

Locations: Eight major metropolitan areas and about 50 college campuses

Members:130,000 nationwide

Flexcar

Founded:1999

First location: Seattle

Fleet:2,000 vehicles

Locations: Ten major metropolitan areas and about 40 college campuses

Members: More than 50,000 nationwide