According to the statistics for July 2022 prepared by the Ministry of Labor and Social Security, 2 million 280 thousand 285 out of 15 million 987 thousand 428 paid employees have union membership. While the Hizmet-İş Union ranked first among all labor unions with 252 thousand 612 members, the business line with the highest number of workers was "trade, office, education and fine arts" with 4 million 86 thousand 7 workers. Among the 20 business lines, other business lines with the highest number of workers were determined as "metal" with 1 million 865 thousand 713 workers and "construction" with 1 million 445 thousand 368 workers. According to the report, 2 million 280 thousand 285, which corresponds to 14.26 percent of 15 million 987 thousand 428 workers, are members of any labor union. Service-İş was followed by the Turkish Metal Union with 245 thousand 602 members and Öz Sağlık-İş with 193 thousand 829 members.
Source:
https://www.ntv.com.tr/turkiye/turkiyede-iscilerin-yuzde-14-26si-sendikali,-LIcJLlG8UO6JtPXZBjXlw