Who are Eligible for Adjustment of Status

Eligible for Adjustment of Status (Form I 485) are:

• K-1 fiance(e) of a US citizen
• K-2 dependent
• K-3 spouse of a US citizen
• K-4 dependent

Other:

• Foreign investors that has an essential immigration petitions may also file to adjust their status.
• Those who are granted asylum in the United States.
• Refugees living in the country for atleast 1 year.
• A Cuban national may also apply - but he must have resided in the U.S. for atleast a year. Same goes with the spouse and children of a Cuban national.

For more info:

http://www.immigrationdirect.com/greencard/Adjustment-of-Status-Form-I-485.jsp