\documentclass[12pt]{letter}
\usepackage[avery5160label,noprintreturnaddress,noprintbarcodes,nocapaddress]{en
vlab}
\makelabels
\begin{document}
\startlabels
\mlabel{}{Search Committee\\
Math Department\\
JMU\\
Harrisonburg VA 22807}
\mlabel{}{Search Committee\\
Math Department\\
U of Iowa\\
Iowa City, IA 52242}
\mlabel{}{Search Committee\\
Math Department\\
Gettysburg College\\
Gettysburg PA 17325}
%
% etc
%
\end{document}