 The city's third-largest employer is Micron Technology.Headquartered in Boise, Idaho, this manufacturer of semiconductors operates its wafer factory in Manassas, where it employs 1650 people directly, and several hundred others through vendor contracts.In December 2018, Micron began a $3 billon-dollar expansion project at the Manassas site, and it's expected to create 1,100 jobs by 2030.