Data from the Panel Survey of Income Dynamics (PSID) indicate that one-fourth of the households eligible for the Food Stamp Program (FSP) do not know they are eligible. Using an FSP participation equation that incorporates a household's perceived FSP eligibility, it was estimated that informational outreach programs directed at these households have the potential of increasing the overall FSP participation rate by a maximum of 18% and benefit payments by 12.6%. These results can be useful in establishing realistic goals for FSP informational outreach programs.