Missouri, Collective bargaining for firefighters, 2002:
https://uselectionatlas.org/RESULTS/state.php?fips=29&year=2002&f=0&off=51&elect=0Oklahoma, "Right to Work", 2001:
https://uselectionatlas.org/RESULTS/state.php?fips=40&year=2001&f=0&off=50&elect=7And here's a manually-drawn map for Missouri's Right to Work amendment from 1978, since I haven't quite aligned the results from the documentation with the results of all 115 combined counties (I'm off by 150 votes in the No column)
The top 10 anti-RTW counties
Washington and Jefferson: 82/18 no
St. Louis City and Ste. Genevieve: 80/20 no
Reynolds: 79/21 no
Ray and St. Francois: 72/28 no
Iron and Lincoln: 70/30 no
St. Charles: 69/31 no
The top 10 pro-RTW counties
Ozark: 63/37 yes
Barton, Shelby, and Nodaway: 64/36 yes
Clark: 65/35 yes
Worth: 66/34 yes
Holt: 67/33 yes
Putnam: 69/31 yes
Scotland: 75/25 yes
Atchison: 77/23 yes
Overall, this amendment failed 60/40