There have been a few requests for information about the range of countries represented at COLING 2018. As a partial answer, we collected (from START) the country of affiliation of the corresponding author of each paper, and were impressed to find 38 countries on that list! [Note: Country names are as shown in START.]
Australia, Belgium, Brazil, Canada, China, Czech Republic, Denmark, Ethiopia, France, Germany, Greece, Hong Kong Special Administrative Region of China, India, Ireland, Israel, Italy, Japan, Kazakhstan, Mexico, Netherlands, Norway, Pakistan, Poland, Qatar, Republic of Korea, Romania, Russian Federation, Saudi Arabia, Singapore, South Africa, Spain, Sweden, Switzerland, Taiwan, Turkey, United Kingdom, United States, and Viet Nam
The most frequently represented countries (among 331 accepted papers) were China (89 papers), United States (69), Germany (26), Japan (19), India (16), United Kingdom (15), France (11), and Netherlands (10).