Per the City of Gaithersburg: Census data shows that the City of Gaithersburg population grew just over 16% in the past 10 years. Census data shows that the City of Gaithersburg population grew just over 16% in the past 10 years. The official 2020 population is 69,657, compared to 59,933 in 2010. Gaithersburg is now the third largest City in Maryland, behind Baltimore at 585,708, and the City of Frederick at 78,171. There are other unincorporated areas in Maryland that have higher population, including MoCo’s very own Germantown and Silver Spring.
Gaithersburg has also grown in diversity in the past decade. The Hispanic/Latino of any race percentage now stands at 28.5%, up from 24.2% in 2010. The White not Hispanic/Latino population is now at 31.5%, down from 40.0% in 2010. The Asian not Hispanic/Latino population in Gaithersburg is 19.0%, up from 16.9% in 2010, while the Black/African American not Hispanic/Latino population stands at 16.1%, up from 15.5% in 2010. The largest change occurred in those reporting multiple races, which increased from 4.8% in 2010 to 11.4% in 2020.
