Montgomery County is the name of 18 counties in the United States of America. Most were named in honor of the general Richard Montgomery, who died in the American Revolutionary War attempting to capture Quebec, Canada:

• Montgomery County, Alabama (This county was not named for Richard Montgomery, but for another general, Lemuel P. Montgomery; oddly, the city of Montgomery, Alabama in it was named for Richard Montgomery.)
• Montgomery County, Arkansas - eponym verified
• Montgomery County, Georgia - eponym verified
• Montgomery County, Illinois - eponym verified
• Montgomery County, Indiana - eponym verified
• Montgomery County, Iowa - eponym verified
• Montgomery County, Kansas - eponym verified
• Montgomery County, Kentucky - eponym verified
• Montgomery County, Maryland - eponym verified
• Montgomery County, Mississippi (Possibly for Richard Montgomery. Possibly for Montgomery County, Tennessee, from which an early settler came.)
• Montgomery County, Missouri - eponym verified
• Montgomery County, New York - eponym verified
• Montgomery County, North Carolina - eponym verified
• Montgomery County, Ohio - eponym verified
• Montgomery County, Pennsylvania (there is some question as to whether this one was named for Richard Montgomery. It seems to be the case, but it is uncertain.)
• Montgomery County, Tennessee (This county was not named for Richard Montgomery, but for John Montgomery, a local settler)
• Montgomery County, Texas (This county was not named for Richard Montgomery, but (indirectly) for Andrew Montgomery, a local settler)
• Montgomery County, Virginia - eponym verified