E-mail reference services in Ohio public libraries was studied using the survey method in January 1999. Through the Ohio Public Library Information Network (OPLIN), the researcher identified 94 Ohio public libraries that have World Wide Web pages that host an e-mail address as a contact method. Fifty-nine questionnaires were returned, resulting in a response rate of 63%. Of these respondents, 88.1% were libraries with collections under 550,000 volumes. While an increase in e-mail was noted by most participants, 52.5% of the respondents estimated that reference questions from patrons via e-mail are less than 25% of the library's total e-mail. Publicity of e-mail reference is not significant, with 71.2% of the respondents stating that their respective libraries have not advertised this option for reference service. A copy of the questionnaire is appended. (Contains 14 references.) (Author/MES)