in urban, suburban, and rural communities (if any) within the county and on Tribal lands (if any) within the county, based on the density of the population in such communities. . (b) Conforming amendment relating to enforcement Section 401 of such Act ( 52 U.S.C. 21111 ) is amended by striking and 303 and inserting 303, and 304 . (c) Clerical amendment The table of contents of such Act is amended— (1) by redesignating the items relating to sections 304 and 305 as relating to sections 305 and 306