NPA	NXX	CLLI	City, ST	Telco
312	336	CHCGILFRDS6	CHICGOZN01	AMERITECH ILLINOIS
312	425	CHCGILFRDS6	CHICGOZN01	AMERITECH ILLINOIS
312	442	CHCGILFRDS6	CHICGOZN01	AMERITECH ILLINOIS
312	960	CHCGILFRDS6	CHICGOZN01	AMERITECH ILLINOIS