An electronic spreadsheet is provided for automatically creating, expanding, and validating lists of cells. A list is created by receiving a user request for selecting a cell range, identifying a list range for the selected cell range, determining a header row for the list range, and generating a border for surrounding the list range. A list is expanded by determining that one or more cells are adjacent to the list and automatically expanding the list to include the new cells. A list is validated by determining a data type of data entered into the list and comparing the data type of the data entered into the list to a list data type. If, as a result of the comparison, the data type of the data entered into the list does not match the list data type, then the data type of the data entered into the list is invalid.