AMP: 4 Location: Main St and I-15, Fillmore I-15 Business reassurance shield as 15 Business and SR-99 begin. The two routes are entirely concurrent with each other. AMP: 4 Location: Main St and I-15, Fillmore Welcome to Fillmore, which is naturally the county seat of Millard County. AMP: 4 Location: Main St and I-15, Fillmore … Continue reading Utah State Route 99, I-15/I-15 Bus to SR-100