when we moved to Charlotte, my youngest was in elementary school and was bussed across town (~45 minute ride each way) to a predominantly black area school and kids from that area were bussed to the general area I live in. *All* schools, no matter where located in the county, have approximately the same proportion of minority students.
[link|http://caselaw.lp.findlaw.com/scripts/getcase.pl?court=US&navby=case&vol=402&invol=1&friend=oyez|U.S. Supreme Court - SWANN v. BOARD OF EDUCATION, 402 U.S. 1 (1971)].