The Boulder County, Colorado School Census 1877 is an annotated index of the census taken to confirm the number of people eligible to attend school in Boulder County. Students were eligible from age 5 to 25. The diary is alphabetical, but there are no page numbers, so the pages have been given numbers starting with 1 with each new letter in the journal (e.g. A1, A2, A3, etc.). There is more than one handwriting in the journal, which may account for why some districts have the sex of the student recorded, and others do not. Having the sex recorded answers some questions. For example, Bertie and Willie are common names during this time period and are used for males or females. One of the most interesting finds is the number of married women recorded in the census.