Question: North of the Gaithersburg area, Interstate 270 passes what urbanized census-designated place in Montgomery County, Maryland?

Context paragraphs:
Gaithersburg, Maryland: Gaithersburg ( ), officially the City of Gaithersburg, is a city in Montgomery County, Maryland.  At the time of the 2010 U.S. Census, Gaithersburg had a population of 59,933, making it the fourth largest incorporated city in the state, behind Baltimore, Frederick, and Rockville.  Gaithersburg is located to the northwest of Washington, D.C., and is considered a suburb and a primary city within the Washington–Arlington–Alexandria, DC–VA–MD–WV Metropolitan Statistical Area.  Gaithersburg was incorporated as a town in 1878 and as a city in 1968.

Maryland Route 121: Maryland Route 121 (MD 121) is a state highway in the U.S. state of Maryland.  Known as Clarksburg Road, the highway runs 3.96 mi from MD 117 in Boyds north to Stringtown Road between Interstate 270 (I-270) and MD 355 in Clarksburg.  MD 121 connects Boyds and Clarksburg in northern Montgomery County.  The highway was paved from Clarksburg to Boyds in the early to mid-1910s.  MD 121 was extended to north of Clarksburg in the late 1920s and early 1930s.  MD 121 was relocated through Clarksburg in the mid-1950s when I-270 was constructed through the area.  The highway's northern end was rolled back to MD 355 in the mid-1970s.  MD 121 was relocated in Boyds in the mid-1980s.  The highway's northern end was moved to its present terminus just north of I-270 when Stringtown Road was constructed in the mid-2000s.  In addition to the Boyds–Clarksburg route, MD 121 has also included three disjoint segments in Dawsonville and Germantown.  All three of these routes were segments of the original MD 119.

Clarksburg, Maryland: Clarksburg is a census-designated place and an unincorporated area in northern Montgomery County, Maryland, United States, located along the Interstate 270 technology corridor about 4 miles north of Germantown, Maryland.  As of Census 2010 its population was 13,766.

Maryland Route 117: Maryland Route 117 (MD 117) is a state highway in the U.S. state of Maryland.  The highway runs 12.40 mi from MD 28 near Dawsonville east to West Diamond Avenue next to MD 355 in Gaithersburg.  MD 117 is an L-shaped highway that connects the rural western Montgomery County communities of Dawsonville and Boyds with Germantown, Gaithersburg, and Interstate 270 (I-270) in the suburban central part of the county.  The highway also provides access to Seneca Creek State Park, the National Institute of Standards and Technology, and several commuter rail stations along MARC's Brunswick Line, which the highway parallels.  MD 117 was the inspiration for the 1971 hit song Take Me Home, Country Roads.

Randolph Road: Randolph Road is a county highway in the U.S. state of Maryland.  The highway is the major component of a mostly four- to six-lane 16.8 mi highway spanning southern Montgomery County and northwestern Prince George's County that also includes Montrose Road, Montrose Parkway, and Cherry Hill Road, and forms an important link between eastern Montgomery County and Rockville.  Montrose Road begins at Maryland Route 189 (MD 189) in Potomac.  The highway heads east through a junction with Interstate 270 (I-270) before the main course continues as Montrose Parkway in North Bethesda.  Montrose Parkway continues through a junction with MD 355, east of which the highway becomes Randolph Road.  Randolph Road intersects MD 586 and MD 185 in Wheaton, MD 97 in Glenmont, and MD 650 in Colesville.  The highway continues southeast toward Fairland, where it meets U.S. Route 29 (US 29).  The highway continues from US 29 as Cherry Hill Road through an intersection with MD 212 in Calverton before reaching its eastern end at US 1 in College Park.

Rockville, Maryland: Rockville is a U.S. city located in the central region of Montgomery County, Maryland.  It is the county seat and is a major incorporated city of Montgomery County and forms part of the Baltimore–Washington metropolitan area.  The 2010 census tabulated Rockville's population at 61,209, making it the third largest incorporated city in Maryland, behind Baltimore and Frederick.  Rockville is the largest incorporated city in Montgomery County, Maryland, although the nearby census-designated place of Germantown is more populous.

Maryland Route 124: Maryland Route 124 (MD 124) is a state highway in the U.S. state of Maryland.  The highway runs 17.03 mi from MD 28 in Gaithersburg north to MD 108 in Damascus.  MD 124 connects the central and northern Montgomery County communities of Gaithersburg, Montgomery Village, Redland, Laytonsville, and Damascus.  The route is a major conduit on the western and northern sides of Gaithersburg, where the highway serves the National Institute of Standards and Technology and Lakeforest Mall and connects with Interstate 270 (I-270) and MD 355.  MD 124 continues north past the Montgomery County Airpark, beyond which the route changes from a four- to six-lane divided highway to a two-lane road as it passes west of Laytonsville on its way to Damascus.

Maryland Route 119: Maryland Route 119 (MD 119) is a state highway in the U.S. state of Maryland.  Also known as Great Seneca Highway, the highway runs 7.47 mi from MD 28 in Rockville north to Middlebrook Road in Germantown.  MD 119 is a four- to six-lane divided highway that connects several residential and commercial neighborhoods in Rockville, Gaithersburg, and Germantown.  Great Seneca Highway was planned by Montgomery County in the late 1960s as a local relief route for traffic on parallel Interstate 270 (I-270) between the three communities.  By the early 1980s, the highway had become controversial because it was proposed to pass through Seneca Creek State Park.  A coalition of civic and environmental groups unsuccessfully pursued litigation to stop the highway.  The National Park Service refused permission for the county to build the highway in 1985 but reversed itself two years later, by which time the first segment of the highway in Germantown was nearing completion.  The Rockville–Gaithersburg section was completed in 1989 and the controversial segment through the state park was finished in 1990.  Almost all of Great Seneca Highway became MD 119 in 1999.

Germantown, Maryland: Germantown is an urbanized census-designated place in Montgomery County, Maryland.  With a population of 90,676 as of 2013 U.S. Census Bureau estimates, Germantown is the third most populous place in Maryland, after the city of Baltimore, and the census-designated place of Columbia.  If Germantown were to incorporate as a city, it would become the second largest incorporated city in Maryland, after Baltimore.  Germantown is located approximately 25-30 mi outside of the U.S. capital of Washington, D.C. and is an important part of the Washingtonian metropolitan area.

Interstate 270 (Maryland): Interstate 270 (abbreviated I-270) is a 34.70 mi auxiliary Interstate Highway in the U.S. state of Maryland that travels between I-495 (the Capital Beltway) just north of Bethesda, Montgomery County and I-70 in the city of Frederick in Frederick County.  It consists of the 32.60 mi mainline as well as a 2.10 mi spur that provides access to and from southbound I-495.  I-270 is known as the Washington National Pike, and makes up the easternmost stretch of the Dwight D. Eisenhower Memorial Highway.  Most of the southern part of the route in Montgomery County passes through suburban areas around Rockville and Gaithersburg that are home to many biotech firms.  This portion of I-270 is up to twelve lanes wide and consists of a local-express lane configuration as well as high-occupancy vehicle lanes that are in operation during peak travel times.  North of the Gaithersburg area, the road continues through the northern part of Montgomery County, passing Germantown and Clarksburg as a six- to eight-lane highway with a HOV lane in the northbound direction only.  North of here, I-270 continues through rural areas into Frederick County and toward the city of Frederick as a four-lane freeway.

Supporting paragraphs: Interstate 270 (Maryland) Germantown, Maryland
Answer: Germantown