NEW YORK—Just one in 20 Americans say they plan to buy a home within the next year, and they are most likely to be 34 years old or younger and living in the South or West, according to a survey released today.

Roughly a quarter of potential buyers said the No. 1 reason they would buy now is because prices have bottomed out. That reason topped bargain- priced foreclosures, worries about rising interest rates and a wide selection of homes.