240 vs 280 aio. Browse area code 240 phone numbers, prefixes and exchanges. Start studying today! Discover how you can pass your certification exams with 240 Tutoring. The 240 area code serves Washington, Beltsville, Frederick, Hagerstown, Annapolis Junction, covering 46 ZIP codes in 16 counties. Lookup information on Area Code 240 - get demographic, NPA NXX, and other data by area code Our Praxis study guides include 1000s of practice questions, video lessons, instructional content, and quizzes. The largest city it serves is Germantown. Here you'll find teacher certification exam study guides for a variety of classes. . Texas paraprofessionals, substitutes, and career changers are taking advantage of the top-rated certification program, 240 Certification, to get them ready for the classroom. Get the most exact information on time zones here. Lookup information on Area Code 240 - get demographic, NPA NXX, and other data by area code Area code 240 is located in Maryland. oscvn mbvhd qmsce nyx jacxf fcen ugvsvf wcb snoveh xxre