Madison at Dell Ranch Apartments for rent in Round Rock, TX on ForRent.com: (866) 306-4849 - Availability, pricing and special promotions subject to change daily. Madison at Dell Ranch is a timeless style of native stone architecture on a shady bank in the southern reach of Round Rock. This property features a combination of functional design, luxury and rustic ambiance. Madison at Dell Ranch is conveniently located on the frontage of new Hwy 45 just minutes from I35 and in walking distance to Dell World Headquarters. Offering one and two bedrooms with amenities such as business center, pool, spa, fitness center, sports court and coffee bar, Madison at Dell Ranch caters to the needs of any resident.