No. It's not available in the API.
(It may be available in the future. Features of Google Maps do migrate into the API, but Google don't make announcements in advance and no-one has a crystal ball.)
You would need to find the city boundaries and draw the line yourself. Boundary data is almost certainly public-domain for the US. Other jurisdictions may not be so forthcoming.
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…