Easy ways to find out if a barbershop serves women is to call the shop and ask them, or to check online reviews and websites, which often provide menus of services. It shouldn't be too difficult to find a barber who will cut women's hair, as many do offer their services to women, despite the "male-only" associations that are often made in relation to the term.
Some barbers who serve both men and women mention this is the names of their shops, such as Sam's Unisex Barbershop in Myrtle Beach, South Carolina; New Faces Unisex in Baltimore, Maryland; and Unisex House of Style in Oceanside, California.
Checking review sites such as Yelp.com is another good way to find a barber. Navigate to Yelp's main page, and type "unisex barber" or "women's barber" in the Find field, and then add the name of the city in which you hope to find a barber to the Near field. Once this information has been added, a list of matching results displays, including contact details for each shop and a map of its location.