We found 3 people named William Costello in Colorado, ranging in age from 41 to 70. Family members include Ann Mildred and Norene M. Their contact numbers include 720-857--9***, 720-254--5***, and 303-419--8*** corresponding to area codes 720 and 303. Records show residents with this name in Aurora, Northglenn, and Englewood.
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