The map of employees is included for two primary reasons. The ratio of where people work to where people live (residential density to employee density) can, by itself, be a good determinant of the walkability of an area. In addition, easy access to services near a person’s employment can be an important way for people to meet basic needs without the use of a car. For example, employees can stop by a grocery store before heading home if it is within convenient walking distance. For this map, employees are estimated using readily available InfoUSA data that contains business addresses and statistics.