You have the following Standard Fields available when importing Contacts in bulk (and of course you can add Custom fields too!):
First Name Address 1 House Number/Name
Last Name Address 1 Street 1
Email Address Address 1 Street 2
Alternative Email Address Address 1 City/Town
Home Tel Address 1 County
Work Tel Address 1 Postcode
Mobile Address 1 Country
Job Title Address 2 (as Address 1 fields above)
Salutation
Gender
Date of Birth
Website address
Notes