Gaithersburg, MD zip codes
Gaithersburg, Maryland has 9 zip codes (5 residential, 4 PO box or single-organization). Most of it is in Montgomery County. Together these zip codes are home to about 144K people.
Zip codes
9
Population
144K
All zips combined
Largest zip
20878
66,115 residents
Income range
$93K–$184K
Median by zip