Washburn Towers Apartments ApartmentsEvent VenueSwimming Pool Washburn Towers Apartments Visit Website 506 S Main Street Ottawa, KS 66067 (785) 242-9444 (785) 242-4135 (fax) Hours: Monday - Friday from 8:30 am - 4:30 pm About About 45 units, including 1 homeless unit. Civic Space available for rent/lease, conference room and theater.