Number of zones in on-street parking system

Seoul 5  as of 2010 (Jun-13)
Barcelona 4   (Jun-12)
Amsterdam 3   (Jun-12)
Antwerp 3   (Jun-12)
Budapest 3   (Jun-12)
Copenhagen 3   (Jun-12)
Paris 3   (Jun-12)
Stockholm 3   (Jun-12)
Utrecht 3   (Jun-12)
Johor Bahru 2   (Mar-14)
Singapore 2  as of 2010 (Jun-13)
Mexico City 1   (Jul-12)
Yichang 1   (Apr-14)