Councilwoman Castillo was born in Santiago, the second largest city in the Dominican Republic, and emigrated with her three daughters to the United States nearly 20 years ago. After arriving in Rhode Island, she settled in Ward 9, where she has lived ever since. Councilwoman Castillo was employed at the Westin Hotel (now the Omni) for 19 years. While working at the hotel, Castillo organized her fellow workers and helped form a union to garner higher wages, more respect, and to secure a better future for service employees and their families. Currently, she is a union steward, and member of the Executive Board for UNITE HERE, Local 217.