Gas prices still on the way up September 7, 2017 News Tweet Share LinkedIn Email The latest price for a gallon of unleaded self service gas in Marshalltown is 2.59. A few short weeks ago the price was 2.24 a gallon. The impact of hurricane Harvey. Leave a ReplyYour email address will not be published.CommentYou may use these HTML tags and attributes: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <s> <strike> <strong> Name * Email * Website Δ