Who uses topographic maps?

Hikers, campers, snow skiers, city and county planners, the Fish and Wildlife Service, Forest Service, miners, loggers, highway planners and construction workers, travelers, surveyors, geologists, engineers, and scientists are just a few of the people who use topographic maps

Hikers, scientists, city planners, geologists, construction workers, engineers, surveyor, etc ... there is a really long list for this question. Hopefully it gives the general idea.