Senatorial district 21 shall consist of the following voting districts in Johnson county: (000430), (000440), (000450), (000510), (000530), (000580), (000590), (000600), (000610), (000620), (000630), (000640), (000650), (000660), (001570), (001610), (001630), (001640), (001650), (001660), (001670), (001680), (001690), (001740), (001750), (003060), (900360); and the following blocks in voting district (900370), tract 0525.05, block group 2, in Johnson county: block 000, block 001, block 002, block 003, block 004, block 005, block 006, block 007, block 008, block 009; and the following blocks in voting district (900370), tract 9800.03, block group 1, in Johnson county: block 016, block 017, block 018, block 023; and the following voting districts in Johnson county: (900380), (900400), (900430), (900440), (900450); and the following blocks in voting district (900460), tract 0524.17, block group 1, in Johnson county: block 028; and the following blocks in voting district (900460), tract 0524.22, block group 1, in Johnson county: block 010; and the following blocks in voting district (900460), tract 0524.23, block group 1, in Johnson county: block 007; and the following blocks in voting district (900460), tract 0529.10, block group 1, in Johnson county: block 000; and the following blocks in voting district (900460), tract 0530.05, block group 1, in Johnson county: block 001, block 002, block 003, block 004, block 005, block 006, block 007, block 008, block 009, block 014, block 015, block 016, block 017, block 018, block 019, block 020, block 021, block 022, block 023, block 024; and the following blocks in voting district (900460), tract 9800.01, block group 1, 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 015, block 016, block 017, block 018, block 019, block 020, block 021, block 022, block 023, block 024, block 025, block 026, block 027, block 028, block 029, block 030, block 031, block 032, block 033, block 034, block 035, block 036, block 037, block 038, block 039, block 040, block 041, block 042, block 043, block 044, block 045, block 046, block 047, block 048, block 052, block 053, block 054, block 055, block 058, block 059, block 060, block 061, block 062, block 063, block 064, block 065, block 066, block 067, block 068, block 069; and the following voting districts in Johnson county: (900470), (900480), (900530), (900540), (900550), (900560), (920130), (920140), (920150), (920160), (920170), (920180), (920190), (920200), (920260), (920270), (920490), (920550), (920560), (920920).