Monrovia is a small unincorporated area located in the southeastern portion of Frederick County. The zip code for the area is 21770, and its coordinates are (39.37 N, 77.27 W).
Monrovia is a part of the Frederick County public school system. Children from the area attend Green Valley or Kemptown Elementary School, Windsor Knolls Middle School, and Urbana High School, or Linganore High School, due to redistricting in the Fall of 2010.
The two major roads in the area are Maryland Route 75 and Maryland Route 80.