Montgomery County is the most populous county in the U.S. state of Maryland, located adjacent to Washington, D.C. As of the 2010 census, the county’s population was 971,777, increasing by 8.1% to an estimated 1,050,688 in 2019. Wikipedia
Population: 1.051 million (2019)
Area code: Area code 240
Congressional districts: Maryland’s: 3rd; 6th; 8th;
ZIP Codes: 20812–20918
sales tax: 1.75%