This report presents information obtained from three questions on the U.S. Census 2000 long form about coresident grandparents, focusing on data from people over age 29 years. Results indicated that the percentage of coresident grandparents varied sharply by race and Hispanic origin. More than half of American Indian and Alaska Native coresident grandparents and black coresident grandparents were responsible for their grandchildren. Younger grandparents were more likely to be responsible for their grandchildren. The west had the highest percentage of coresident grandparents. Counties in the midwest had some of the lowest coresident grandparent percentages. At the state level, Hawaii had the highest percentage of grandparents living with grandchildren, and North Dakota had the lowest. For many grandparent caregivers, this responsibility was a long-term commitment. San Diego, California, had the lowest percentage of coresident grandparents among the 10 largest cities in the United States. Of the 5.8 million coresident grandparents in 2000, 64 percent were women. Nearly all of grandparent caregivers were either the householder or the spouse of the householder. Nearly 20 percent of grandparent caregivers had incomes below the poverty level. (SM)