Representative district 21 shall consist of the following blocks in voting district (001580), tract 0511.00, block group 1, in Johnson county: block 000, block 001, block 011, block 012, block 013, block 016, block 017, block 018, block 019, block 020, block 021; and the following voting districts in Johnson county: (001590), (001600), (001700); and the following blocks in voting district (001720), tract 0513.00, block group 3, in Johnson county: block 000, block 001, block 002, block 003, block 004, block 005, block 006, block 007, block 008, block 009, block 010, block 011, block 012, block 013, block 014, block 015, block 016, block 017; and the following voting districts in Johnson county: (002510); and the following blocks in voting district (002520), tract 0507.00, block group 3, in Johnson county: block 011, block 012, block 013, block 014, block 015, block 016, block 017, block 018, block 019; and the following blocks in voting district (002520), tract 0509.00, block group 2, in Johnson county: block 012; and the following blocks in voting district (002520), tract 0510.00, block group 2, in Johnson county: block 000, block 001, block 002, block 003, block 004, block 005, block 006, block 012; and the following blocks in voting district (002520), tract 0510.00, block group 3, in Johnson county: block 000, block 001, block 002, block 003, block 004, block 005, block 006, block 007; and the following voting districts in Johnson county: (002530), (002540), (002550), (002560), (002570), (002580), (002590), (002600), (002610), (002650), (002660), (002670), (920270); and the following blocks in voting district (920280), tract 0511.00, block group 2, in Johnson county: block 000, block 001, block 002, block 013, block 014, block 015, block 016, block 017, block 018, block 028, block 029, block 030.