Background: Although plain language is almost universally promoted by teachers of professional writing, editors, and communication professionals, some have argued that the effects of and preferences for plain style in written messages differ among groups of individuals. Research questions: 1. Do professionals prefer plain style? 2a. Do preferences differ for different categories of style? 2b. Do preferences differ for different groups of workers? Literature review: Style, the word- and sentence-level elements in a written text, is a critical element of plain language. There is evidence that plain style, however, affects readers differently based on their level of subject matter knowledge. Plain style is even criticized by a few. There is a long history of tensions surrounding linguistic prescriptivism, the notion that one manner of language use is superior to all others. Further, readers' preferences for writing style, plain or otherwise, may not be consistent across occupational positions, education levels, nationalities, personality types, or genders. Research methodology: We conducted a quantitative study of preferences for two major style categories (conciseness and word choice) using an online survey instrument. The student-recruiter technique provided us with usable responses from 614 working adults in the US. Using that data, we calculated proportions of respondents, with confidence intervals, who chose the plain-style options. We also used statistical tests to explore associations between preferences and respondent characteristics. Results and conclusions: Our findings support an overwhelming preference for plain style among US professionals who are native speakers of English. Reader preferences were stronger for elements associated with word choice than with conciseness. Those with lower education levels and blue-collar occupations had lower preferences for plain style. The study had two major limitations: 1. We investigated only two aspects of plain style rather than the full range of elements that make up plain language. 2. Our data-collection instrument presented readers with an artificial rather than an authentic reading experience. Future research may investigate the role of personality on stylistic preferences and the attributions readers make about writers based on their style.