ˌɛmdˈiː fˈoːɹhˈʌndɹɪd sˈɛvən bɪɡˈɪnz æɾ ɐn ˌɪntɚsˈɛkʃən wɪð ˌɛmdˈiː θˈɜːɾi wˈʌn nˈuː wˈɪndsɚ ɹˈoʊd nɔːɹθwˈɛst ʌv mˈɑːɹstən ænd sˈaʊθ ʌv nˈuː wˈɪndsɚ.
MD 407 begins at an intersection with MD 31 (New Windsor Road) northwest of Marston and south of New Windsor.