Manassas is part of the Washington-Arlington-Alexandria, DC-VA-MD-WV Metropolitan Statistical Area and is in the Northern Virginia region.

At that time, Manassas Junction was little more than a railroad crossing, but a strategic one, with rails leading to Richmond, Virginia, Washington, D.C., and the Shenandoah Valley.

In 1975, Manassas was incorporated as an independent city, and as per Virginia law, was separated from Prince William County.

[12] Annaburg was purchased by the City of Manassas in July 2019 to be restored and preserved as a public park.

[15] The climate in this area is characterized by hot, humid summers and generally mild to cool winters.

This can be broken up ethnically as follows (2010 numbers): The population density for the city is 3,782.1 people per square mile, and there are an estimated 13,103 housing units in the city with an average housing density of 1,310.3 per square mile.

City residents are primarily employed in Professional, Scientific and Technical Services, and Health Care and Social Assistance.

[29] The ACS estimated mean travel time to work for the given population in 2021 was approximately 34.7 minutes.

Headquartered in Boise, Idaho, this manufacturer of semiconductors operates its wafer factory in Manassas, where it employs 1,650 people directly, and several hundred others through vendor contracts.

In December 2018, Micron began a $3 billion-dollar expansion project at the Manassas site, and it's expected to create 1,100 jobs by 2030.

In 2019 High Purity Systems, a locally based high-tech contracting company, announced plans to invest $8.5 million in new facilities to triple production capability, marking the continued expansion of high-tech firms in the area.

There are 415 based airplanes and two fixed-base operators, APP Jet Center and Dulles Aviation.

In 2006, Mayfield Intermediate School opened, serving students in fifth and sixth grade.

Due to growth, Baldwin Intermediate School opened in September 2017, also serving 5th and 6th graders.

Though some of these are just outside the city limits in Prince William County, NVCC and Strayer call these branches their Manassas Campuses.

Amtrak and the Virginia Railway Express (VRE) provide regular inter-city and commuter service to the city and surrounding area on the tracks owned by NS.